reverse-number.md

title	type	tags	cover	dateModified
Reverse number	snippet	math	taking-photos	2020-11-02 19:28:27 +0200

Reverses a number.

• Use str() to convert the number to a string, slice notation to reverse it and str.replace() to remove the sign.
• Use float() to convert the result to a number and math.copysign() to copy the original sign.

from math import copysign

def reverse_number(n):
  return copysign(float(str(n)[::-1].replace('-', '')), n)

reverse_number(981) # 189
reverse_number(-500) # -5
reverse_number(73.6) # 6.37
reverse_number(-5.23) # -32.5