题解 | #字符个数统计#
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
Python哈希表
word_dict = {}
for num in range(128):
word_dict[chr(num)] = 0
str_in = input()
for i in range(len(str_in)):
word_dict[str_in[i]] = 1
count = 0
for key in word_dict.keys():
if word_dict[key]:
count+=1
print(count)
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