Convert binary string to hex string and keep its leading zeros

Question

May I know how to write a Python script to convert binary string to hexadecimal string and keep the leading zeros?

For an example, I have binary string "0000000000001010" and would like to print it into "000A". I know i can use zfill() function, but the number of leading zeros is unknown.

Is it guranteed that the string's length is divisible by 4?

NaCl
– NaCl

2015-05-09 18:05:24 +00:00
Commented May 9, 2015 at 18:05 — NaCl
– NaCl, Commented May 9, 2015 at 18:05

Stefan Pochmann · Accepted Answer · 2015-05-09 17:56:18Z

5

Just divide the number of bits by 4:

>>> bits = "0000000000001010"
>>> '{:0{}X}'.format(int(bits, 2), len(bits) // 4)
'000A'

answered May 9, 2015 at 17:56

Stefan Pochmann

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1 Comment

rypel Over a year ago

thrilled to see that int() can take a base!

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