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.
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Difference between List, List<?>, List<T>, List<E>, and List<Object>
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
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Why does += behave unexpectedly on lists?
The += operator in python seems to be operating unexpectedly on lists. Can anyone tell me what is going on here? class foo: bar = [] def __init__(self,x): self.bar += [x] clas...
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Python: list of lists
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
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What is the difference between list [1] and list [1:] in Python?
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.
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Meaning of list[-1] in Python
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...
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What does [:-1] mean/do in python?
It gets all the elements from the list (or characters from a string) but the last element. : represents going through the list -1 implies the last element of the list
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pandas dataframe index: to_list () vs tolist ()
Note that the question was about pandas tolist vs to_list. pandas.DataFrame.values returns a numpy array and numpy indeed has only tolist. Indeed, if you read the discussion about the
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