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Could size () have come with an. Len is a function to get the length of a collection. I found two ways to determine how many elements are in a variable… i always get the same values for len () and size ().

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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 the docs len(s) return the length (the number of items) of an object. Row count of a dataframe:

__something__ attributes are special and usually more than meets the eye, and generally.

The argument may be a sequence (such as a string, bytes, tuple, list, or range) or a collection. From elements of programming interviews in phyton, page 37, this little program reorders an array of integers so that the even numbers appear first. 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. The are cases when it's useful to have the index around, though, such as when.

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. It works by calling an object's __len__ method.

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