每次调用file.write()时,我都想在字符串中添加换行符。在Python中最简单的方法是什么?


当前回答

实际上,当你使用多行语法时,就像这样:

f.write("""
line1
line2
line2""")

你不需要添加\n!

其他回答

如果你大量使用它(写了很多行),你可以子类化'file':

class cfile(file):
    #subclass file to have a more convienient use of writeline
    def __init__(self, name, mode = 'r'):
        self = file.__init__(self, name, mode)

    def wl(self, string):
        self.writelines(string + '\n')

现在它提供了一个额外的函数wl来做你想要的:

with cfile('filename.txt', 'w') as fid:
    fid.wl('appends newline charachter')
    fid.wl('is written on a new line')

也许我遗漏了一些东西,比如不同的换行符(\n, \r,…),或者最后一行也以换行符结束,但这对我来说是有效的。

你可以在需要这种行为的特定地方装饰方法write:

#Changed behavior is localized to single place.
with open('test1.txt', 'w') as file:    
    def decorate_with_new_line(method):
        def decorated(text):
            method(f'{text}\n')
        return decorated
    file.write = decorate_with_new_line(file.write)
    
    file.write('This will be on line 1')
    file.write('This will be on line 2')
    file.write('This will be on line 3')

#Standard behavior is not affected. No class was modified.
with open('test2.txt', 'w') as file:
        
    file.write('This will be on line 1')
    file.write('This will be on line 1')
    file.write('This will be on line 1')  

为了支持多种操作系统的使用: 文件。写(f'some字符串和/或{variable}。{os.linesep}”)

使用“\ n”:

file.write("My String\n")

参考Python手册。

好的,这里有一个安全的方法。

with open('example.txt', 'w') as f:
 for i in range(10):
  f.write(str(i+1))
  f.write('\n')


这将在新行中对每个数字写入1到10。