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python/snippets/reverse-number.md

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+---
+title: Reverse number
+type: snippet
+tags: [math]
+cover: taking-photos
+dateModified: 2020-11-02T19:28:27+02:00
+---
+
+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.
+
+```py
+from math import copysign
+
+def reverse_number(n):
+  return copysign(float(str(n)[::-1].replace('-', '')), n)
+```
+
+```py
+reverse_number(981) # 189
+reverse_number(-500) # -5
+reverse_number(73.6) # 6.37
+reverse_number(-5.23) # -32.5
+```