如何删除python3中字符串的“\n”？

Question

if __name__ == '__main__':
    string =[' \n            Boeing Vancouver\n          ', '\n          Airbus\n        ', '\n          Lockheed Martin\n        ', '\n          Rolls-Royce\n        ', '\n          Northrop Grumman\n        ', '\n          BOMBARDIER\n        ', '\n          Raytheon\n        ']
    for item in string:
        item.replace("\n"," ")
        item.strip()
    print(string)

输出和输入是一样的，为什么？你知道吗

Answer 1

您可以使用list comprehension，例如：

代码：

[s.replace("\n", " ") for s in a_string]

测试代码：

a_string = [' \n            Boeing Vancouver\n          ',
          '\n          Airbus\n        ',
          '\n          Lockheed Martin\n        ',
          '\n          Rolls-Royce\n        ',
          '\n          Northrop Grumman\n        ',
          '\n          BOMBARDIER\n        ',
          '\n          Raytheon\n        ']


print([s.replace("\n", " ") for s in a_string])

结果：

['              Boeing Vancouver           ', 
 '           Airbus         ', 
 '           Lockheed Martin         ', 
 '           Rolls-Royce         ', 
 '           Northrop Grumman         ', 
 '           BOMBARDIER         ', 
 '           Raytheon         ']

Answer 2

字符串在python中是不可修改的。您可以使用列表理解简单地去掉前导或尾随的空格来创建新的列表。你知道吗

[x.strip() for x in string]

Answer 3

您需要再次查看the documentation：

Return a copy of the string with all occurrences of substring old replaced by new. If the optional argument count is given, only the first count occurrences are replaced.

换句话说，item.replace("\n"," ")本身什么也不做。你知道吗