String is anagram

Checks if a string is an anagram of another string (case-insensitive, ignores spaces, punctuation and special characters).

• Use str.isalnum() to filter out non-alphanumeric characters, str.lower() to transform each character to lowercase.
• Use collections.Counter to count the resulting characters for each string and compare the results.

from collections import Counter

def is_anagram(s1, s2):
  return Counter(
    c.lower() for c in s1 if c.isalnum()
  ) == Counter(
    c.lower() for c in s2 if c.isalnum()
  )

is_anagram('#anagram', 'Nag a ram!')  # True