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The trailing 'L' in representations of long integers causes the int function to raise a ValueError. This is unexpected because it's reasonable to expect that `int` should be able to parse a number from any string when that string represented as a bare word would be a valid python number. The following all raise ValueError:
int(hex(12345L), 16)
int(oct(12345L), 8)
but not
int('12345', 10)
int(hex(12345), 16)
int(oct(12345), 8)
(and not bin() because of http://bugs.python.org/issue3186)