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  • Meaning of list[-1] in Python - Stack Overflow
    I have a piece of code here that is supposed to return the least common element in a list of elements, ordered by commonality: def getSingle(arr): from collections import Counter c = Counte
  • How to list all installed packages and their versions in Python?
    Is there a way in Python to list all installed packages and their versions? I know I can go inside python Lib site-packages and see what files and directories exist, but I find this very awkward
  • What is the difference between list and list [:] in python?
    When reading, list is a reference to the original list, and list[:] shallow-copies the list When assigning, list (re)binds the name and list[:] slice-assigns, replacing what was previously in the list Also, don't use list as a name since it shadows the built-in
  • slice - How slicing in Python works - Stack Overflow
    The first way works for a list or a string; the second way only works for a list, because slice assignment isn't allowed for strings Other than that I think the only difference is speed: it looks like it's a little faster the first way Try it yourself with timeit timeit () or preferably timeit repeat ()
  • python - if else in a list comprehension - Stack Overflow
    Since a list comprehension creates a list, it shouldn't be used if creating a list is not the goal; it shouldn't be used simply to write a one-line for-loop; so refrain from writing [print(x) for x in range(5)] for example
  • How to concatenate (join) items in a list to a single string
    For handling a few strings in separate variables, see How do I append one string to another in Python? For the opposite process - creating a list from a string - see How do I split a string into a list of characters? or How do I split a string into a list of words? as appropriate
  • What is the syntax to insert one list into another list in python?
    What is the syntax to insert one list into another list in python? [duplicate] Asked 14 years, 10 months ago Modified 6 years, 1 month ago Viewed 349k times
  • TypeError: list indices must be integers or slices, not str
    Another common mistake is to initialize a list but try to assign values to it using a key The initialization probably happened dynamically and it's not clear later on that it's in fact a list For example, in the following case, d is initialized as a list but there's an attempt to add a key-value pair to it




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