30秒学会 Python 片段 – Reverse number

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.

代码实现

from math import copysign

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

使用样例

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

翻译自：https://www.30secondsofcode.org/python/s/reverse-number