def statistics_Letters():
while 1:
letters_num=0
input_sentence = input("请输入你的句子,输入q or Q则退出程序:")
if len(input_sentence )==1:
if input_sentence=="q" or input_sentence=="Q":
return None
for i in input_sentence:
if "a"<=i<="z" or "A"<=i<="Z":
letters_num+=1
print(letters_num)
print(statistics_Letters())
2019-04-15:判断一个输入的句子中有多少个字母
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转载自blog.csdn.net/sinat_18722099/article/details/89321166
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