python - 在字符串中查找短语

Question

我正在尝试检查字符串中是否存在短语“purple cow”。 “purple”和“cow”之间必须至少有一个空格或标点符号； “紫牛”是 Not Acceptable 。我尝试了以下程序，但收到错误消息。

import string

def findPC(string):

    strLower = string.lower()

    # remove 'purplecow' in strLower
    strLowerB = strLower.replace('purplecow', '')
    print(strLowerB)

    strList = list(strLowerB)
    print(strList)

    # remove punctuation in strLowerB
    punct = string.punctuation()
    for char in strList:
        if char in punct:
            strList.replace(char, '')

    # remove spaces in strLowerB
    strLower.replace(' ', '')
    print(strLower)

    # look for 'purplecow' in strLowerB
    return 'purplecow' in string


print(findPC('The purple cow is soft and cuddly. purplecow. Purple^&*(^&$cow.'))

错误信息:

Traceback (most recent call last):   File "C:/Python36/findPC.py",
line 28, in <module>
    print(findPC('The purple cow is soft and cuddly. purplecow. Purple^&*(^&$cow.'))   File "C:/Python36/findPC.py", line 15, in
findPC
    punct = string.punctuation() AttributeError: 'str' object has no attribute 'punctuation'

Answer 1

代码中的错误源于您在两个地方使用了 string，它们的含义不同。我对您的代码进行了一些编辑，以使其按您预期的方式工作。

import string

def findPC(input_string):

    strLower = input_string.lower()

    # remove 'purplecow' in strLower
    strLowerB = strLower.replace('purplecow', '')
    print(strLowerB)

    # remove punctuation in strLowerB
    punct = string.punctuation
    for char in punct:
      strLowerB = strLowerB.replace(char, '')

    # remove spaces in strLowerB
    strLowerB.replace(' ', '')
    print(strLowerB)

    # look for 'purplecow' in strLowerB
    return 'purplecow' in strLowerB


print(findPC('The purple cow is soft and cuddly. purplecow. Purple^&*(^&$cow.'))