Remove last digit from integer and put zero in python

Question

I have the small code, which is converting the integer to 10 bit binary and forming it as integer:

a = 2251
binary = bin(int(a))[2:].zfill(15)
print binary

it will give result as:

100011001011

and after that I want to remove the last four digits from 100011001011 and put zeros instead of that, means my final answer should be:

100011000000

please suggest if any good ideas...

Answer 1

You can do this with some simple bit shifting:

>>> a = 2251
>>> a = (a >> 4) << 4  # <--
>>> print format(a, 'b')
100011000000

To demonstrate what's going on, imagine that a had the binary representation 1111 1111:

a             == 11111111

a &gt&gt 4        == 00001111

(a &gt&gt 4) &lt&lt 4 == 11110000

Answer 2

You can use a simple bitwise operation:

>>> a = 2251
>>> a = a & ~0b1111
>>> print format(a, 'b')
100011000000