count在python中的运用

如何在python中数一句话(My email address is wang.lu@mail.shufe.edu.cn It was created on 1st Sept. 2017 Friday)中的e有几个

sentence = "My email address is wang.lu@mail.shufe.edu.cn It was created on 1st Sept. 2017 Friday"
count_e = sentence.count('e')
print( count_e)

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