from collections import defaultdict
strings = (‘puppy’, ‘kitten’, ‘puppy’, ‘puppy’,
‘weasel’, ‘puppy’, ‘kitten’, ‘puppy’)
counts = defaultdict(lambda: 0)
for item in strings:
counts[item] +=1
print(counts)
Python defaultdict用法
from collections import defaultdict
strings = (‘puppy’, ‘kitten’, ‘puppy’, ‘puppy’,
‘weasel’, ‘puppy’, ‘kitten’, ‘puppy’)
counts = defaultdict(lambda: 0)
for item in strings:
counts[item] +=1
print(counts)
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