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Python 2.7 – 29

Oh how much this first one sucks. Pretty ugly, this one is. 63 chars.

''.join([bin(~0)[3:] if x == '0' else bin(~1)[4:] for x in '']) 

This one is a bit better but still not that fancy. 44 chars.

''.join([str(int(not(int(x)))) for x in '']) 

Since int(x) and 1 returns int(x) if it's not 0 and otherwise False. The solution can be further reduced to 36 chars.

''.join([str(1-int(x)) for x in '']) 

Since join() takes a generator the brackets can be removed. 32 chars.

''.join(str(1-int(x))for x in'') 

And backticks can be used instead of str()

''.join(`1-int(x)`for x in'') 

Reduced to 44 from 29 thanks to pointers from @TheRare

Finding one's complement is difficult in python since bin(-int) returns -0bxxx hence the above.

Python 2.7 – 34*

Oh how much this first one sucks. Pretty ugly, this one is. 63 chars.

print''.join([bin(~0)[3:] if x == '0' else bin(~1)[4:] for x in '']) 

This one is a bit better but still not that fancy. 44 chars.

print''.join([str(int(not(int(x)))) for x in '']) 

Since int(x) and 1 returns int(x) if it's not 0 and otherwise False. The solution can be further reduced to 36 chars.

print''.join([str(1-int(x)) for x in '']) 

Since join() takes a generator the brackets can be removed. 32 chars.

print''.join(str(1-int(x))for x in'') 

And backticks can be used instead of str()

print''.join(`1-int(x)`for x in'') 

Reduced to 44 from 34 thanks to pointers from @TheRare

Finding one's complement is difficult in python since bin(-int) returns -0bxxx hence the above.

Python 2.7 – 34

Oh how much this first one sucks. Pretty ugly, this one is. 63 chars.

''.join([bin(~0)[3:] if x == '0' else bin(~1)[4:] for x in '']) 

This one is a bit better but still not that fancy. 44 chars.

''.join([str(int(not(int(x)))) for x in '']) 

Since int(x) and 1 returns int(x) if it's not 0 and otherwise False. The solution can be further reduced to 36 chars.

''.join([str(1-int(x)) for x in '']) 

Since join() takes a generator the brackets can be removed. 32 chars.

''.join(str(1-int(x))for x in'') 

Reduced to 44 from 32 thanks to pointers from @TheRare

Finding one's complement is difficult in python since bin(-int) returns -0bxxx hence the tricks above.

Python 2.7 – 29

Oh how much this first one sucks. Pretty ugly, this one is. 63 chars.

''.join([bin(~0)[3:] if x == '0' else bin(~1)[4:] for x in '']) 

This one is a bit better but still not that fancy. 44 chars.

''.join([str(int(not(int(x)))) for x in '']) 

Since int(x) and 1 returns int(x) if it's not 0 and otherwise False. The solution can be further reduced to 36 chars.

''.join([str(1-int(x)) for x in '']) 

Since join() takes a generator the brackets can be removed. 32 chars.

''.join(str(1-int(x))for x in'') 

And backticks can be used instead of str()

''.join(`1-int(x)`for x in'') 

Reduced to 44 from 29 thanks to pointers from @TheRare

Finding one's complement is difficult in python since bin(-int) returns -0bxxx hence the above.

Python 2.7 – 34

Oh how much this first one sucks. Pretty ugly, this one is. 63 chars.

''.join([bin(~0)[3:] if x == '0' else bin(~1)[4:] for x in '']) 

This one is a bit better but still not that fancy. 44 chars.

''.join([str(int(not(int(x)))) for x in '']) 

Since int(x) and 1 returns int(x) if it's not 0 and otherwise False. The solution can be further reduced to 36 chars.

''.join([str(1-int(x)) for x in '']) 

Since join() takes a generator the brackets can be removed. 34 chars.

''.join(str(1-int(x)) for x in '') 

Reduced to 44 from 34 thanks to pointers from @TheRare

Finding one's complement is difficult in python since bin(-int) returns -0bxxx hence the tricks above.

Python 2.7 – 34

Oh how much this first one sucks. Pretty ugly, this one is. 63 chars.

''.join([bin(~0)[3:] if x == '0' else bin(~1)[4:] for x in '']) 

This one is a bit better but still not that fancy. 44 chars.

''.join([str(int(not(int(x)))) for x in '']) 

Since int(x) and 1 returns int(x) if it's not 0 and otherwise False. The solution can be further reduced to 36 chars.

''.join([str(1-int(x)) for x in '']) 

Since join() takes a generator the brackets can be removed. 32 chars.

''.join(str(1-int(x))for x in'') 

Reduced to 44 from 32 thanks to pointers from @TheRare

Finding one's complement is difficult in python since bin(-int) returns -0bxxx hence the tricks above.