*pendwill point to the first character in str which follows the representation of the number. If base is
0, the radix will be determined base on the leading characters of str: if str starts with
'0X', radix 16 will be used; if str starts with
'0', radix 8 will be used; otherwise radix 10 will be used. If base is not
0, it must be between
36, inclusive. Leading spaces are ignored. If there are no digits, ValueError will be raised.
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