If I have two strings of binary representation. How to do bitwise on them?
Example
a = '101'
b = '010'
c = a | b
c => '111'
asked Oct 20, 2020 at 14:10
Anirban Nag 'tintinmj'
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2 Answers
First, use int to convert the binary strings to numbers. You can use the second parameter of int to specify the base, 2 in this case. Then, you can use | to "or" the numbers and bin or a format-string (many different possibilities here) to convert back to binary.
>>> a = '101'
>>> b = '010'
>>> c = int(a, 2) | int(b, 2)
>>> bin(c)
'0b111'
>>> f"{c:b}"
'111'
>>> format(c, "b")
'111'
The latter two can also be used to add any number of leading zeros, if necessary, e.g. using 08b instead of b in the format string.
2 Comments
tobias_k
@AnirbanNag'tintinmj' Then you are using an older version of Python. Use the ones that do not give an error.
Kelly Bundy
Removes leading zeros, though, for example
'010' and '001' turn into '11' instead of '011'.A solution that works on the strings (not via ints) and keeps leading zeros intact:
>>> a = '0101'
>>> b = '0011'
>>> ''.join(map(max, a, b))
'0111'
Needs the strings to have equal length, but given your example where one string has a leading zero so it's as long as the other, I guess that's the case for you.
2 Comments
tobias_k
Neat... but you might add a note that both strings have to be the same length.
Kelly Bundy
Hmm, since the OP's example is
'101' and '010', not '10', I believe their strings do have the same length.
|operation. 3. Convert result to string. (4. Profit.)