from collections import defaultdict
class PermutationsAlt(object):
def is_permutation(self, str1, str2):
if str1 is None or str2 is None:
return False
if len(str1) != len(str2):
return False
unique_counts1 = defaultdict(int)
unique_counts2 = defaultdict(int)
for char in str1:
unique_counts1[char] += 1
for char in str2:
unique_counts2[char] += 1
return unique_counts1 == unique_counts2
from collections import defaultdict
class PermutationsAlt(object):
def is_permutation(self, str1, str2):
if str1 is None or str2 is None:
return False
if len(str1) != len(str2):
return False
unique_counts1 = defaultdict(int)
unique_counts2 = defaultdict(int)
for char in str1:
unique_counts1[char] += 1
for char in str2:
unique_counts2[char] += 1
return unique_counts1 == unique_counts2