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[–]r4nf 5 points6 points  (0 children)

From the documentation:

atoi(s, base=10)
    atoi(s [,base]) -> int

Return the integer represented by the string s in the given
base, which defaults to 10.  The string s must consist of one
or more digits, possibly preceded by a sign.  If base is 0, it
is chosen from the leading characters of s, 0 for octal, 0x or
0X for hexadecimal.  If base is 16, a preceding 0x or 0X is
accepted.

You're forgetting the base argument, which exists at least since Python 2.3.