Python Flatten List Of Tuples

Normally, items of the iterable should be numbers. extend(flatten(el)) Python › General › Python - python-list. learnpython) submitted 2 years ago by Zeekawla99ii I have the following list of tuples in Python3. Language may be either the (english) name of the language/locale, or The string itself is in UTF-8. $\begingroup$ Just to clarify, Python questions are okay here if they directly relate to Blender (for example in Blender Python scripting, or Python in the Blender Game Engine). For example, the length of a string, a list, and a tuple can be determined with a function called len():. Return a copy of the array data as a (nested) Python list. This book also shows you how to use Python for applications in business, science, and the arts, using various Python tools and open source packages. The colon in the middle is how Python's lists recognize that we want to use slicing to get objects in the list. That is an easy way to flatten lists. "+" in Python is symmetric: A + B and B + A should always yield the same result. f(a) def f (tuple): x,y,z = tuple You could also pass the elements of the tuple in: f(a[0], a[1], a[2]) That would do it the way you describe in your post. To do otherwise would be more surprising than any of the surprises above. In this updated edition, Bill Lubanovic takes you from the basics to more involved and varied topics, mixing tutorials with cookbook-style code recipes to explain concepts in Python 3. In Python, as in Java, it is possible to overflow the stack while attempting to flatten certain data structures recursively. strides (int or tuple/list of 1 int,) – Specify the strides of the convolution. The region is defined by a 4-tuple, where coordinates are (left, upper, right, lower). insert(i, v) insert at i. Go to the editor Click me to see the sample solution. The syntax of sorted() method is:. Python dictionaries are composed of key-value pairs, so in each loop, there are two elements we need to access (the key and the value). They must always use the sorted function to return a sorted list. Mastering this concept would help you in two ways: You would start writing. It works for lists that have a maximum depth of nesting roughly equal to the recursion depth limit of Python, which is set to 1000 by default, though it can be increased with sys. 7:40 -list. Building Skills in Python file:///Volumes/SLOTT02/Writing/Technical/PythonBook-2. Introduction to app of learning python. Now the files are organized in a deep nested structure, but Sophia doesn’t like this. With lists, this is not possible. Creates (packs) a third tuple by concatenating the first two tuples. Tuples and Sequences¶ We saw that lists and strings have many common properties, such as indexing and slicing operations. Explicit is better than implicit. Python Overview Python Built-in Functions Python String Methods Python List Methods Python Dictionary Methods Python Tuple Methods Python Set Methods Python File Methods Python Keywords Module Reference Random Module Requests Module Python How To Remove List Duplicates Reverse a String Python Examples Python Examples Python Exercises Python. expression(i) Expression is based on the variable used for each element in the old list. x? • Installing python from your package manager? Probably installing python 2. Let's help Sophia to flatten these dictionaries. We'll show you how you can implement it in just a few lines of Python. start (optional) - this value is added to the sum of items of the iterable. In this way, GIMP-Python is similar to Script-Fu, except that you can use the full set of Python extension modules from the plug-in. Python Overview Python Built-in Functions Python String Methods Python List Methods Python Dictionary Methods Python Tuple Methods Python Set Methods Python File Methods Python Keywords Module Reference Random Module Requests Module Python How To Remove List Duplicates Reverse a String Python Examples Python Examples Python Exercises Python. I have a list of tuples: self. It is actually a smart way to introduce new users to functional programming concepts (after all a list comprehension is just a combination of map and filter) and compact statements. @alist: A tuple or list. You will find them in virtually every nontrivial Python program. Python only manipulates references and objects, which is higher-level programming. Kyosohma I'm not sure about the first question, but as for the second, you could do a few different things. ndim-levels deep nested list of Python scalars. Python sorted () The sorted() method returns a sorted list from the given iterable. Sometimes you need to flatten a list of lists. After that, the Python join method is used with the comma separator. Flatten list of dictionaries to a tuple. The actual comes from set theory, where an ordered n-tuple is a sequence of n elements. 6 -m timeit -s 'tot =. The list contains four string elements. Use Python's generator functions and generator expressions to work with collections in a non-strict (or lazy) manner. Each tuple contains a datetime object followed by an integer. You can create a named tuple by providing keys and values directly:. In Python, the most important data structures are List, Tuple, and Dictionary. While tuples are immutable lists, frozensets are immutable sets. append(item) is faster than the shortcuts posted so far. gridKeys self. strides: An integer or tuple/list of 2 integers, specifying the strides of the convolution along the height and width. Sets are optimized for speed in such functions. Packing and Unpacking. Here is an example. So there is a slight performance boost. * Special-cases string types and treats them as non-iterable. With lists, this is not possible. This function also only flattens lists, not tuples (intentionally), if you wanted it to flatten tuples it should only require some slight tweaking (which I'll leave to. ActiveState Code (http://code. It is defined within parentheses where items are separated by commas. Tuple is an ordered sequence of items same as list. Note that when executing eagerly, getting this property evaluates regularizers. Flatten a list/tuple and Call a function with tuples Hi, I am wondering how do I 'flatten' a list or a tuple? For example, I'd like to transform[1, 2, (3,4)] or [1,2,[3,4]] to [1,2,3,4]. 18 Most Common Python List Questions How to Convert A Python List to a Tuple. To fix this you could add the restriction type(x) == type (or type(x) != type in the verbose version). General Python questions belong over at Stack Overflow. How to flatten a python nested list(tuple) - generator - flatten. The data may be local or it may be in an H2O cluster. The data are loaded from a CSV file or from a native Python data structure, and is either a Python client-relative file, a cluster-relative file, or a list of H2OVec objects. They are two examples of sequence data types (see Sequence Types — list, tuple, range). Tuple unpacking is a fantastic and powerful feature, but here it makes you have to squint and count brackets to see which thing is being assigned to output (since , can occur within a list). Python Overview Python Built-in Functions Python String Methods Python List Methods Python Dictionary Methods Python Tuple Methods Python Set Methods Python File Methods Python Keywords Module Reference Random Module Requests Module Python How To Remove List Duplicates Reverse a String Python Examples Python Examples Python Exercises Python. The old way would be to do this using a couple of loops one inside the other. Hello everybody, Any better solution than this? def flatten(x): res = [] for el in x: if isinstance(el,list): res. The proposed design uses four Python classes: ArrayType, UFunc, Array, and ArrayView; and a low-level C-extension module, _ufunc,. In addition to lists and tuples, dictionaries are another common Python data type you're likely to encounter when working with data, and for loops can iterate through dictionaries, too. Python Forums on Bytes. extend(v) append v to the end, but flatten v one level if its a list. On a flat stone surface, we play a game of marbles. In this lecture, Dr. Since Python is an evolving language, other sequence data types may be added. Constructors with optional dtype¶ These are the simplest and often-preferred methods for creating symbolic variables in your code. A tuple is an assortment of data, separated by commas, which makes it similar to the Python list, but a tuple is fundamentally different in. 0, and should be deprecated in Python 2. The default value of start is 0 (if omitted). how to remove brackets within a list. Once I have my list I will append the data onto my dict keys on a character by character basis. GitHub Gist: instantly share code, notes, and snippets. learnpython) submitted 5 years ago * by n8henrie n8henrie I've been working with Python for almost a year now, and I always forget how to use list comprehension with tuples (and why it doesn't work the way I think it should). This module implements a number of iterator building blocks inspired by constructs from APL, Haskell, and SML. Raises: AttributeError: if the layer has no defined input_shape. x • Python 3. It will create the original list, but in tuple format. Note − Tuple are very similar to lists with only difference that element values of a tuple can not be changed and tuple elements are put between parentheses instead of square bracket. In this tutorial we will understand Python lists through practical examples. You have a list of lists (a sequence of sequences) and want to create one list (sequence) from them. Tuples and Sequences¶ We saw that lists and strings have many common properties, such as indexing and slicing operations. Your immediate problem is that your deriv function is trying to multiply the ordinary Python list, Cv_data (passed in as Cv) by float values. Overview of Python Lists and Tuples Two of the most commonly used built-in data types in Python are the list and the tuple. Python list definition. One of the differences we noted is that the elements of a list can be modified, but the characters in a string cannot. It is actually a smart way to introduce new users to functional programming concepts (after all a list comprehension is just a combination of map and filter) and compact statements. Because strings are sequence types as well, much of what we learn here can be applied to strings as. Because tuples are immutable, they are not easy to process whereas lists are always a better option while processing. case c7d8c99 Aug 9, 2019. We will see two methods of doing this. Write a Python script that illustrates tuple packing. Mastering this concept would help you in two ways: You would start writing. Now the files are organized in a deep nested structure, but Sophia doesn’t like this. Q&A for Work. Advanced Expressions. Sets are optimized for speed in such functions. There is also another standard sequence data type: the. Here are a few different and slightly similar way's of flattening an irregular list. Return a copy of the array data as a (nested) Python list. Tuple to list?. This is a more efficient version of the get_json_object UDF because it can get multiple keys with just one call. raw download clone embed report print Python 1. The data may be local or it may be in an H2O cluster. # range returns a list of integers (Python 2) or a sequence (Python 3) range ( 0 , 3 ) # returns [0, 1, 2]: includes start value but excludes stop value range ( 3 ) # equivalent: default start value is 0. multipart/* and message/rfc822). This seems to work on any list, including one of lists or tuples: [[elem,already. Because strings are sequence types as well, much of what we learn here can be applied to strings as. Python, 19 lines. Micro-benchmarks: Python 2. flat lists). the contents of the tuple are as follows: ('--datasourcename', 'DB') I want to access everything in the second argument, but i am not sure how to go about this without converting to a string. Explore Channels Plugins & Tools Pro Login About Us. The list function. Sometimes you need to flatten a list of lists. collections. A tuple is defined analogously to lists, except that the set of elements is enclosed in parentheses instead of square brackets. Python programers may have hard times with pointers and arrays in C or C++. Python dictionaries are composed of key-value pairs, so in each loop, there are two elements we need to access (the key and the value). This is a recipe to flatten a Python list which may have nested lists as items within it. Reversing a list is a common operation in Python programming. Python | Joining only adjacent words in list; Python | Sort Flatten list of list; Python | Element Occurrence in dictionary of list values; Python | Alternate range slicing in list; Python | Column summation of tuples; Python | Splitting list on empty string; Python | Clearing list as dictionary value; Python | Getting sublist element till N. To allow module writers to write modules in a high-level language, for implementation or for prototyping. Tuple unpacking method Converting list/tuples of tuples/lists into Dictionary Converting Dictionary to List of tuples Lambda introduction Sorting List of tuples and dictionaries Finding max(), min() in a dict Wherever you go, dictionary follows you! Counter() - simplest counting algorithm. Pythonで多次元のリスト(リストのリスト、ネストしたリスト)を一次元に平坦化する方法について説明する。2次元のリストを平坦化itertools. How do I convert between tuples and lists? is already a tuple. Write a Python program to print a list of space-separated elements. To fix this you could add the restriction type(x) == type (or type(x) != type in the verbose version). start (optional) - this value is added to the sum of items of the iterable. tolist ¶ Return the array as an a. So, we must do this with iteration. For example, imagine you had a sorted list of customer names that your program displays in alphabetical (A-Z) order. has syntax differences (e. $\begingroup$ Just to clarify, Python questions are okay here if they directly relate to Blender (for example in Blender Python scripting, or Python in the Blender Game Engine). print) and unfamiliar libraries (e. GitHub Gist: instantly share code, notes, and snippets. you can use a list comprehension: new_list = [float(integral) for integral in old_list]. It applies a rolling computation to sequential pairs of values in a list. case c7d8c99 Aug 9, 2019. Can be a single integer to specify the same value for all spatial dimensions. (10 replies) i am trying to access elements of a tuple without using the [1:5] notation. If you are exhausting large portions of an iterator before working with the other returned by tee(), you may be better off casting the input iterator to a list or tuple. A tuple is defined analogously to lists, except that the set of elements is enclosed in parentheses instead of square brackets. Meaning, the number of elements in each tuple is 1. For each entry in sequence, it will add the given key value pair in dictionary and if key already exists then it will update its value. Our focus here is the difference between Python lists and tuples. Bell introduces compound data types, such as lists and tuples, and explains the concepts of aliasing, mutability, and cloning. py Find file Copy path kkimdev Disallow dictionary argument for tf. Q&A for Work. keys() a list and not a set? map vs. Because python’s stack is going to blow up when the depth of the list is something ridiculously large. Below are some ways to achieve the above task. asarray (a, Input data, in any form that can be converted to an array. Allows duplicate members. datetime(2005, 7, 13, 16, 0, 54), 315),. Go to this link from the python tutorials. • Tuple items are not indexed. Sets being mutable are unhashable, so they can't be used as dictionary keys. You could just pass the tuple itself into the function and have the tuple unpacked inside the function. Used to set various Spark parameters as key-value pairs. In this lecture, Dr. Combining two iterables of tuples with padding or pivot nested iterable. Converting 2d list of tuples from string to ints (self. The actual comes from set theory, where an ordered n-tuple is a sequence of n elements. [code][ ['4', '21', '1', '14', '2008-10-24 15:42:58'], ['3', '22', '4', '2somename', '2008-10-24 15:22:03'], ['5', '21', '3. Python dictionaries are composed of key-value pairs, so in each loop, there are two elements we need to access (the key and the value). Go to the editor Click me to see the sample solution. Python Overview Python Built-in Functions Python String Methods Python List Methods Python Dictionary Methods Python Tuple Methods Python Set Methods Python File Methods Python Keywords Module Reference Random Module Requests Module Python How To Remove List Duplicates Reverse a String Python Examples Python Examples Python Exercises Python. You have a list of lists (a sequence of sequences) and want to create one list (sequence) from them. Append empty lists to a list and add elements. Flatten the list to "remove the brackets"using a nested list comprehension. from_iterable()sum()処理速度の差 itertools. The word itself is a generic form of words you're probably quite familiar with: single, double, triple, quadruple, quintuple, sextuple, … n-tuple. return a resulting RDD that contains a tuple with the list of values for that key in self as and then flattening the. If you ask Python programmers what they like most about Python, they will often cite its high readability. map() return of flat tuple list. Each tuple contains a datetime object followed by an integer. On a flat stone surface, we play a game of marbles. ops import variable_scope as vs from tensorflow. The data may be local or it may be in an H2O cluster. Setup a private space for you and your coworkers to ask questions and share information. The rules for indices are the same as for lists. How to flatten a python nested list(tuple) - generator - flatten. You can do that using loops. map creates a map object which is what you are seeing. A tuple consists of a number of values separated by commas, for instance:. You could just pass the tuple itself into the function and have the tuple unpacked inside the function. Function that returns a tuple. Combining two iterables of tuples with padding or pivot nested iterable. They must always use the sorted function to return a sorted list. (Mar-22-2017, 09:44 AM) zivoni Wrote: List comprehension is more universal, as sets work only with hashable items. There is also another standard sequence data type: the tuple. It is actually a smart way to introduce new users to functional programming concepts (after all a list comprehension is just a combination of map and filter) and compact statements. Sets are optimized for speed in such functions. Skip navigation Sign in. But some solutions take more than linear time. Let's see this with the help of example. extend(v) append v to the end, but flatten v one level if its a list. Creating a tuple is as simple as putting different comma-separated values. An example of using join method with a list. Python Forums on Bytes. enumerate returns a sequence of (number, item) tuples; when Python sees the target list (i,value) it unpacks (number, item) tuple into the target list. This is a more efficient version of the get_json_object UDF because it can get multiple keys with just one call. I used a loop + extend but flatten would have been much more elegant. Here are a few different and slightly similar way's of flattening an irregular list. Many a time while developing web and desktop product in Python, we use nested lists and have several queries about how to find count of unique tuples. Flatten a list/tuple and Call a function with tuples Showing 1-28 of 28 messages. Python Tutorial: map, filter, and reduce. Python dictionaries are composed of key-value pairs, so in each loop, there are two elements we need to access (the key and the value). The only difference is that tuples are immutable. I want two separate lists: One list with the first element of every tuple, and the second list with the second element of every tuple. argtype_tuple = lambda args: tuple (type (a) for a in args). flatten 'A' means to flatten in column-major order if a is Fortran contiguous in memory, row-major order otherwise. Write a Python program to find a tuple, the smallest second index value from a list of tuples. How to flatten a python nested list(tuple) - generator - flatten. List comprehension with tuples (self. You should specify what you exactly mean by merge two lists. asarray (a, Input data, in any form that can be converted to an array. A sextuple has 6 items. You will learn about list, dict, tuples, sets, strings and other Python data structures. copy (extra=None) ¶ Creates a copy of this instance with the same uid and some extra params. collections. trace ([offset, axis1, axis2. GitHub Gist: instantly share code, notes, and snippets. Reversing a list is a common operation in Python programming. Tuples have different names. One way is to iterate over the list until no lists remain:. This means that we can add values, delete values, or modify existing values. They are two examples of sequence data types (see Sequence Types — list, tuple, range). Python Overview Python Built-in Functions Python String Methods Python List Methods Python Dictionary Methods Python Tuple Methods Python Set Methods Python File Methods Python Keywords Module Reference Random Module Requests Module Python How To Remove List Duplicates Reverse a String Python Examples Python Examples Python Exercises Python. Listing 1 shows the beginning of a Python script that: Creates (packs) two simple tuples. It does seem strange that I can't express that fact with typing and mypy. Same as lst[len(lst):len(lst)] = v: lst. Data items are converted to the nearest compatible builtin Python type, via the item function. Remove duplicates. Python Forums on Bytes. Previous Next In this post, we will see how to create an empty list in python. In addition to lists and tuples, dictionaries are another common Python data type you’re likely to encounter when working with data, and for loops can iterate through dictionaries, too. List of lists of dictionaries (self. shuffle (lst ) Note − This function is not accessible directly, so we need to import shuffle module and then we need to call this function using random static object. In this way, GIMP-Python is similar to Script-Fu, except that you can use the full set of Python extension modules from the plug-in. They must always use the sorted function to return a sorted list. Dictionaries themselves cannot be used as members of a set as they are mutable, but tuples can. The data are loaded from a CSV file or from a native Python data structure, and is either a Python client-relative file, a cluster-relative file, or a list of H2OVec objects. Finding overlapping tuples in a Python list and shuffling them (self. Here is a list of python tips and tricks to help you write an elegant Python Itertools tricks. Since tuples are arrays that you cannot modify, they don't have an in-place sort function that can be called directly on them. Function that returns a tuple. As the name suggests filter extracts each element in the sequence for which the function returns True. This book also shows you how to use Python for applications in business, science, and the arts, using various Python tools and open source packages. reshape , it returns a new array object with the new shape specified by the parameters (given that, with the new shape, the amount of elements in the array remain unchanged) , without changing the shape of the original object, so when you are calling the. The loop way. But the compiler will check them. In this article, I will explain why one of the simplest solution sum(lst, []) is actually one of the worst solution. Three Dimensional NumPy arrays (3D): It means the collection of homogenous data in lists of lists of a list (tensor). A list is an ordered collection of values. An example of using join method with a list. If a single iterable is passed, zip() returns an iterator of 1-tuples. x list dictionary. This is an excerpt from the Scala Cookbook (partially modified for the internet). The data may be local or it may be in an H2O cluster. index; modules |; next |; previous |; Python »; en 3. The reason is simple: just as we were able to use multi-indexing to represent two-dimensional data within a one-dimensional Series, we can also use it to represent data of three or more dimensions in a Series or DataFrame. Each sub-tuple is a language/string pair. Sometimes you need to flatten a list of lists. To create a sextuple, use the Tuple constructor. strides: An integer or tuple/list of 2 integers, specifying the strides of the convolution along the height and width. Flatten iterables. Introduction to app of learning python. Tuples are sequences, just like lists. flat_list = [item for sublist in l for item in sublist] which means: flat_list = [] for sublist in l: for item in sublist: flat_list. List comprehension is a complete substitute for the lambda function as well as the functions map(), filter() and reduce(). Example 3: Sort the list using sorted() having a key function. BTW, welcome to Blender Stack Exchange! $\endgroup$ - Mentalist Feb 15 at 13:06. For 2-tuples you take Cartesian product with N ordered by sum of indices. Python Forums on Bytes. \$\endgroup\$ - 200_success Mar 12 '16 at 2:37. The function returns the correct path tuples (row,col), but I need it in the form of a List of tuples. That’s why we brought these 30 Python programming questions on List, Tuple, and Dictionary in this blog post. If you are exhausting large portions of an iterator before working with the other returned by tee(), you may be better off casting the input iterator to a list or tuple. I wanted to extract each pixel values so that i can use them for locating simple objects in an image. It is defined within parentheses where items are separated by commas. The second option to make flat lists out of lists of lists is to use list comprehension. If you're searching for a fully matching tuple among a list of tuples, you could simply use the in operator to implicitly call the list type's __contains__() special method. Such a version lets you flatten nested sequences with nesting levels higher than Python's recursion limit, which normally allows no more than a few thousand levels of recursion depth. argtype_tuple = lambda args: tuple (type (a) for a in args). learnpython) submitted 28 days ago by b_eagle1 Currently working on an assignment and I cannot figure out how to convert this:. $\begingroup$ Just to clarify, Python questions are okay here if they directly relate to Blender (for example in Blender Python scripting, or Python in the Blender Game Engine). Return a copy of the array data as a (nested) Python list. asarray ¶ numpy. In addition to lists and tuples, dictionaries are another common Python data type you’re likely to encounter when working with data, and for loops can iterate through dictionaries, too. The data are loaded from a CSV file or from a native Python data structure, and is either a Python client-relative file, a cluster-relative file, or a list of H2OVec objects. Python Overview Python Built-in Functions Python String Methods Python List Methods Python Dictionary Methods Python Tuple Methods Python Set Methods Python File Methods Python Keywords Module Reference Random Module Requests Module Python How To Remove List Duplicates Reverse a String Python Examples Python Examples Python Exercises Python. In someways a tuple is similar to a list in terms of indexing, nested objects and repetition but a tuple is immutable unlike lists which are mutable. Because strings are sequence types as well, much of what we learn here can be applied to strings as. "+" in Python is symmetric: A + B and B + A should always yield the same result. Some methods supported by Python (called iterators in Python3), such as filter (), map(), and reduce(), are very useful when you need to repeat over the items in a list, create a dictionary, or extract a subset of a list. Python Forums on Bytes. Think now of a Python list. 18 Most Common Python List Questions Discover how to create a list in Python, select list elements, the difference between append() and extend(), why to use NumPy and much more. Go to the editor Click me to see the sample solution. Need help? Post your question and get tips & solutions from a community of 428,001 IT Pros & Developers. Flatten a list You are encouraged to solve this task according to the task description, using any language you may know. padding (int or a tuple/list of 1 int,) – If padding is non-zero, then the input is implicitly zero-padded on both sides for padding number of points; dilation (int or tuple/list of 1 int) – Specifies the dilation rate to use for dilated convolution. For 2-tuples you take Cartesian product with N ordered by sum of indices. Tuples that contain immutable elements can be used as a key for a dictionary. Let's create a tuple from the same list of WoW classes above. Like a tuple, a named tuple is ordered and immutable, and enclosed in parentheses; like a dictionary, each element has a unique key that can be used to access it. a tuple cannot be changed in any way once it has been created. In this article, I will explain why one of the simplest solution sum(lst, []) is actually one of the worst solution. Since Python is an evolving language, other sequence data types may be added. setrecursionlimit(). Data Structures (list, dict, tuples, sets, strings)¶ There are quite a few data structures available. I'm trying to using the map function to convert a tuple to a list, without success. To get 3-tuples you take Cartesian product of N and the list of 2-tuples, ordered by sum of the. flatten 'A' means to flatten in column-major order if a is Fortran contiguous in memory, row-major order otherwise. Constructors with optional dtype¶ These are the simplest and often-preferred methods for creating symbolic variables in your code. finding/returning lowest/highest int in lists, in a tuple I need python to return the lowest and highest number for each 'item' in each list compared to the other. learnpython) submitted 2 years ago by Zeekawla99ii I have the following list of tuples in Python3. Most likely you mean concatenation which as others have answered, can be done by the "+" operation between lists [code]listA = [1,2,3] listB = [3,4,5] mergedList = listA + listB print(me. Flatten list in Python 3: flatten. There is also an optional second clause that we can add that allows us to set how the list's index will increment between the indexes that we've set. The function returns the correct path tuples (row,col), but I need it in the form of a List of tuples. In this post, I am demonstrating the difference between list and tuple in Python. The main technique for recursion removal is to keep an explicit last-in, first-out (LIFO) stack, which, in this case, we can implement with a list of iterators:. reshape , it returns a new array object with the new shape specified by the parameters (given that, with the new shape, the amount of elements in the array remain unchanged) , without changing the shape of the original object, so when you are calling the. Python dictionaries are a convenient data type to store and process configurations. Python for Lisp Programmers This is a brief introduction to Python for Lisp programmers. NumPy arrays are used to store lists of numerical data and to represent vectors, matrices, and even tensors. The most direct way to access the values in the Reader object is to convert it to a plain Python list by passing it to list(). How to flatten a python nested list(tuple). Of course, "[e for l in lst for e in l]" (from David Robinson's answer) is the fastest way to do it, but I think it would be impossible to do this "without [implicitly] actually iterating through the original list of tuples". Using list() on this Reader object returns a list of lists, which you can store in a variable like exampleData. Tuple is an ordered sequence of items same as list. 5/python 2 of 458 1/27/08 9:01 PM Expression Style Notes 5. Since Python is an evolving language, other sequence data types may be added. Below are some ways to achieve the above task. List comprehension with tuples (self. argtype_tuple = lambda args: tuple (type (a) for a in args).