[pre-commit.ci] auto fixes from pre-commit.com hooks

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Author: pre-commit-ci[bot]

maths/armstrong_numbers.py

@@ -29,7 +29,7 @@ def armstrong_number(n: int) -> bool:
     number_of_digits = 0
     temp = n
     # Calculation of digits of the number
-    number_of_digits=len(str(n))
+    number_of_digits = len(str(n))
     # Dividing number into separate digits and find Armstrong number
     temp = n
     while temp > 0: