How to Convert Float Number (Fraction) to Hexadecimal in Python?

We known that in Javascript, we can use the toString(16) to convert an integer to its hexadecimal representation. That works even for float numbrs, for example,

(0.5).toString(16)
"0.8"
(1.5).toString(16)
"1.8"
(0.3).toString(16)
"0.4ccccccccccccc"

In python, you can do this using the following function FloatToHex that will print at most (by default) 16 decimal places in hexadecimal form.

import sys

def FloatToHex(x, k = 16):
    if x < 0: 
        sign = "-"
        x = -x
    else:
        sign = ""
    s = [sign + str(int(x)) + '.']
    x -= int(x)
    for i in range(k):
        y = int(x * 16)
        s.append(hex(y)[2:])
        x = x * 16 - y
    return ''.join(s).rstrip('0')

if __name__ == "__main__":
    print(FloatToHex(float(sys.argv[1])))

Examples:

# python3 FloatToHex.py 0.5
0.8
# python3 FloatToHex.py 0.6
0.99999999999998
# python3 FloatToHex.py 0.3
0.4ccccccccccccc
# python3 FloatToHex.py 2.3
2.4cccccccccccc
# python3 FloatToHex.py -2.3
-2.4cccccccccccc

The complexity is O(1) if we consider the string manipulation is also O(1) and the hex function in Python runs at O(1) constant.

python

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