How to turn to 0 the specific bit of number in Python?

Question

For example, I have a number 255 that is 1111 1111 in binary form. I want to turn the first bit to 0 and get the 0111 1111 (127). What is the easiest way to do this? How I can change the bits of number directly?

The more generic question and solution: http://stackoverflow.com/questions/12173774/modify-bits-in-an-integer-in-python — amito, Sep 06 '15 at 07:36

score 5 · Accepted Answer · answered Sep 06 '15 at 07:34

5

a = 0b11111111    # = 255
mask = 0b01111111 # = 127

res = a & mask
print('{0} {0:08b}'.format(res))
# -> 127 01111111

answered Sep 06 '15 at 07:34

hiro protagonist

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I got the idea. Thank you! – splash27 Sep 06 '15 at 07:37
Accept the answer then :) – amito Sep 06 '15 at 07:39
Is the first zero, before `b`, related to the sign? – Daniel Möller Aug 18 '17 at 17:32
1

you mean the leading zero in the formatting string `08b`? that will just zero-fill the resulting string if the bitlength is shorter than 8. `'{0:03b}'.format(0) = 000`. – hiro protagonist Aug 19 '17 at 07:26

How to turn to 0 the specific bit of number in Python?

1 Answers1