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pythonbit-manipulationtypeerrorunary-operator

TypeError: bad operand type for unary ~: 'long' in Python

I am from a C background and hence this problem in Python really confounds me

Consider this 

print ~(1 << 1)

This correctly prints -3.

Consider this

print ~(1 << 0)

This flags an error like

TypeError: bad operand type for unary ~: 'long'

I checked for various other positive values of shift count and it works fine. Only a shift count of zero doesn't seem to work. All similar posts on unary operators that I found on SO dealt with other operators like +, - etc but not ~

I just dabble in Python every now and then, so I may be missing something silly but googling dint help much

PS: I ran this on codeskulptor which is probably using Python 2.7, I am not sure though

EDIT: This turns out to be a bug in Codeskulptor. I wrote a mail to Prof Rixner who's the main developer to take note of this bug. Thanks all.

Solution

  • This is an error with CodeSkulptor's implementation.

    If you force the value back to int, it works:

    print ~(int(1 << 0))

    Okay, perhaps 'error' was too strong -- looking at their site they only claim to "implement a subset of Python 2".