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![Meaning of list[-1] in Python](/images/main/395.webp)
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... …
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. …
can we have list comprehension without a for loop and just if/else to put a single default value inside the list and later extend it if required? i.e. result = [ ''hello'' if x == 1 ]. …
The notation List means "a list of something (but I''m not saying what)". Since the code in test works for any kind of object in the list, this works as a formal method parameter. Using a type parameter …
![What is the difference between list and list [:] in python?](/images/main/2298.webp)
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. …
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How can I check if a list has any duplicates and return a new list without duplicates?
![What is the difference between list and list [1:] in Python?](/images/main/913.webp)
By using a : colon in the list index, you are asking for a slice, which is always another list. In Python you can assign values to both an individual item in a list, and to a slice of the list. …
The first, [:], is creating a slice (normally often used for getting just part of a list), which happens to contain the entire list, and thus is effectively a copy of the list. The second, list(), is using the actual …
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
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