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The argument may be a sequence (such as a string, bytes, tuple, list, or range) or a collection. I know that python has a len() function that is used to determine the size of a string, but why is it not a method of the string object? From elements of programming interviews in phyton, page 37, this little program reorders an array of integers so that the even numbers appear first.

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__something__ attributes are special and usually more than meets the eye, and generally. From the docs len(s) return the length (the number of items) of an object. Part of the reason for the len function vs using.__len__() or.len() is that python was intended to be a language that is easy to learn.

Len(df), df.shape[0], or len(df.index) len(df) # 5 df.shape[0] # 5 len(df.index) # 5 it seems silly to compare the performance of constant time.

Len is a function to get the length of a collection. It works by calling an object's __len__ method. I found two ways to determine how many elements are in a variable… i always get the same values for len () and size (). Row count of a dataframe:

The are cases when it's useful to have the index around, though, such as when. Could size () have come with an.

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