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1. Top results related to define list in python

   • Define a long list of variables in python

     Top Answer

     Answered Feb 17, 2012 · 6 votes

     The more concise way to do this would be to use a dictionary:

     COLUMN_VARIABLES = ['provider', 'language','subtype']data = {}-for variable in COLUMN_VARIABLES: data[variable] = node.xpath("//%s/text()"%variable)[0]

     Pro tip: any time you find yourself wanting to use variable variable names, it means you don't want variables, you want one container to hold all that data instead.

     Check all answers on Stack Overflow

     1/5

   • List of non-zero elements in a list in Python

     Top Answer

     Answered May 23, 2017 · 11 votes

     List comprehension method:

     a = [6, 3, 0, 0, 1, 0]b = [1 if i else 0 for i in a]print b>>> [1, 1, 0, 0, 1, 0]

     Timing mine, Dave's method and Lattyware's slight alteration:

     $ python3 -m timeit -s "a = [6, 3, 0, 0, 1, 0]" "[1 if i else 0 for i in a]"1000000 loops, best of 3: 0.838 usec per loop$ python3 -m timeit -s "a = [6, 3, 0, 0, 1, 0]" "[int(i != 0) for i in a]"100000 loops, best of 3: 2.15 usec per loop$ python3 -m timeit -s "a = [6, 3, 0, 0, 1, 0]" "[i != 0 for i in a]"1000000 loops, best of 3: 0.794 usec per loop

     Looks like my method is twice as fast ... I am actually surprised it is that much faster. Taking out the int() call, however, makes the two essentially the same - but leaves the resulting list full of Booleans instead of Integers (True/False instead of 1/0)

     Other Answers

     Answered May 27, 2013 · 5 votes

     b = [int(i != 0) for i in a]-

     Will give you what you are looking for.

     Other Answers

     Answered May 27, 2013 · 2 votes

     For completeness, and since no one else added this answer:

     b = map(bool, a)-

     But it returns Boolean values and not Integers.

     Check all answers on Stack Overflow

     2/5

   • Define stubs in python

     Top Answer

     Answered Sep 29, 2021 · 2 votes

     So let's start simple, you got some statement, let's parse it into simple parts and connect it into the Python world.

     • Define stubsnoun Something cut short or arrested in development. (source)
     • for the functions get_user_num() and compute_avg()The keyword def introduces a function definition. It must be followed by the function name and the parenthesized list of formal parameters. The statements that form the body of the function start at the next line, and must be indented. (source)
     • Each stub should printCheck how to output something with Python to the console.
     • followed by a newlineAs in do not make two FIXME lines collapse onto each other like this: FIXME: somethingFIXME: something else .the Unix end-of-line convention '\n', the Windows convention '\r\n', and the old Macintosh convention '\r'...(source)
     • and should return -1
     • Each stub must also contain the function's parameters.Undefined anywhere. So either use something you'd normally use for a let's say maths function or likes
     • Sample output with two calls to get_user_num() and one call to compute_avg() : ...This is how the final program should behave once executed. A function is called by first being ensuring it's been defined previously, then writing its name + () e.g. func() .Judging by the undefined func arguments and two related functions, you might want to connect the two functions either directly or with an intermediary item holding the result.

     After these steps you should be able to create the final program. Do not try to create it at once, utilize the bullet points as small steps and always check if the file still works (executes properly). Create multiple files (copy-paste) when necessary.

     Nobody cares how it looks like while developing. You're learning, you'll become better eventually.

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     3/5

   • Define words in Python

     Top Answer

     Answered Jul 29, 2015 · 1 votes

     output_word = output_word.decode()-

     will convert the bytes to a string.

     UPDATE

     this is the last state from the script in the chat (still far from perfect...):

     import requestsfrom lxml import htmldef define_word(word): response = requests.get( "http://dictionary.reference.com/browse/{}?s=t".format(word)) tree = html.fromstring(response.text) title = tree.xpath('//title/text()') print(title) defs = tree.xpath('//div[@class="def-content"]/text()') # print(defs) defs = ''.join(defs) defs = defs.split('\n') defs = [d for d in defs if d] for d in defs: print(d)define_word('python')

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     4/5

   • Python | Insert list in another list

     The problem of inserting a number at any index is a quite common one. But sometimes we require to insert the whole list into another list. These kinds of problems occur in Machine Learning while playing with data. Let’s discuss certain ways in which this problem can be solved.

     Method #1: Using insert() + loop In this method, we insert one element by 1 at a time using the insert function. This way we add all the list elements at the specified index in other list. 

     Step-by-step approach:

     Use the insert() method of the test_list to insert each element of the insert_list at the appropriate position, calculated using the formula i + pos, where i is the index of the current element in the insert_list....

     • Use a for loop to iterate over the elements of the insert_list.
     • Use the insert() method of the test_list to insert each element of the insert_list at the appropriate position, calculated using the formula i + pos, where i is the index of the current element in the insert_list.

     Check all answers on Geeksforgeeks

     5/5

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2. www.w3schools.com › python › python_listsPython Lists - W3Schools

   www.w3schools.com › python › python_lists

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   Learn how to create and use lists in Python, one of the four built-in data types for storing collections of data. Lists are ordered, changeable and allow duplicates, and can contain different data types.

3. www.geeksforgeeks.org › python-listsPython Lists - GeeksforGeeks

   www.geeksforgeeks.org › python-lists

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   • Creating a List in Python. Lists in Python can be created by just placing the sequence inside the square brackets[]. Unlike Sets, a list doesn’t need a built-in function for its creation of a list.
   • Accessing elements from the List. In order to access the list items refer to the index number. Use the index operator [ ] to access an item in a list. The index must be an integer.
   • Getting the size of Python list. Python len() is used to get the length of the list. Python3. List1 = [] print(len(List1)) List2 = [10, 20, 14] print(len(List2))
   • Taking Input of a Python List. We can take the input of a list of elements as string, integer, float, etc. But the default one is a string. Example 1: Python3.

4. realpython.com › python-listPython's list Data Type: A Deep Dive With Examples

   realpython.com › python-list

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   Jul 19, 2023 · Python’s list is a flexible, versatile, powerful, and popular built-in data type. It allows you to create variable-length and mutable sequences of objects. In a list, you can store objects of any type. You can also mix objects of different types within the same list, although list elements often share the same type.

5. People also ask

   How do you create a list in Python?

   • In Python programming, a list is created by placing all the items (elements) inside square brackets [], separated by commas. It can have any number of items and they may be of different types (integer, float, string etc.).

   Python List. How to create a list? | by Razia Khan | Medium

   medium.com/@raziakhan0810/python-list-2934ab32dd8

   See all results for this question

   What are some of the methods associated with a Python list?

   • Python List provides different methods to add items to a list. 1. Using append () The append () method adds an item at the end of the list. For example, numbers = [21, 34, 54, 12] print("Before Append:", numbers) # using append method numbers.append (32) print("After Append:", numbers)

   Python List (With Examples) - Programiz

   www.programiz.com/python-programming/list

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   What are the benefits of using a list in Python?

   • Sets are the iterable and mutable unordered collection of data types in Python. Python uses lists to store the sequential order of different kinds of data. Because Python lists are mutable types, we can change their elements after they’ve been generated.

   How To Convert A Set To A List In Python - Python Guides

   pythonguides.com/convert-a-set-to-a-list-in-python/

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6. www.programiz.com › python-programming › listPython List (With Examples) - Programiz

   www.programiz.com › python-programming › list

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   • Create a Python List. We create a list by placing elements inside square brackets [], separated by commas. For example, # a list of three elements ages = [19, 26, 29] print(ages) # Output: [19, 26, 29]
   • Access List Elements. Each element in a list is associated with a number, known as a list index. The index always starts from 0, meaning the first element of a list is at index 0, the second element is at index 1, and so on.
   • Add Elements to a Python List. We use the append() method to add elements to the end of a Python list. For example, fruits = ['apple', 'banana', 'orange'] print('Original List:', fruits)
   • Change List Items. We can change the items of a list by assigning new values using the = operator. For example, colors = ['Red', 'Black', 'Green'] print('Original List:', colors)

7. www.freecodecamp.org › news › how-to-use-lists-in-pythonHow to Use Lists in Python – Explained with Example Code

   www.freecodecamp.org › news › how-to-use-lists-in-python

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   Mar 1, 2024 · For example, let's say you're planning a trip to the grocery store. You can create a Python list called grocery_list to keep track of all the items you need to buy. Each item, such as "apples," "bananas," or "milk," is like an element in your list. Here's what a simple grocery list might look like in Python: grocery_list = ["apples", "bananas ...

8. python.land › python-data-types › python-listPython List: How To Create, Sort, Append, Remove, And More

   python.land › python-data-types › python-list

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   Jun 5, 2022 · Using the list() function. Python lists, like all Python data types, are objects. The class of a list is called ‘list’, with a lower case L. If you want to convert another Python object to a list, you can use the list() function, which is actually the constructor of the list class itself. This function takes one argument: an object that is ...

9. www.pythontutorial.net › python-basics › python-listPython List - An Essential Guide to the Python List for Beginners

   www.pythontutorial.net › python-basics › python-list

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   Learn what a list is, how to create, access, modify, add, and remove elements in a list. A list is an ordered collection of items enclosed in square brackets ([]).