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python - 为什么循环在写入文件时执行两次

问题描述

我有2个文件abc.txt，cde.txt

abc.txt 的内容是“这是 abc 文件” cde.txt 的内容是“这是 cde 文件”

我正在尝试写入文件。但是内容写了两次下面是代码

in_files = ['abc.txt','cde.txt']
out_files = ['abc_output.txt','cde_output.txt']
read_dict = {}
for file in in_files:
    with open(file,'r') as read_file:
        lines = read_file.readlines()
        read_dict[file] = lines
read_dict
for k,v in read_dict.items():
    for out in out_files: 
        with open(out,'w+') as write_file:
             for i in v:
                print(i)

输出

This is abc file
This is abc file
This is cde file
This is cde file

预期的

This is abc file
This is cde file

标签： pythonfile

解决方案

如果您更改print(i)为print('writing to', write_file, i)，您会看到第一次打印“ This is abc file ”是针对您写入abc_output.txt的时间，第二次打印是针对您将输出到cde_output.txt的时间。

您的预期输出只会在每个文件中显示一次。这是你想要的，还是你想要“这是 abc 文件”只输出到abc_output.txt和“这是 cde 文件”只输出到cde_output.txt？如果是这种情况，你会想做这样的事情：

in_files = ['abc.txt','cde.txt']
out_files = ['abc_output.txt','cde_output.txt']
read_dict = {}
for in_f, out_f in zip(in_files, out_files):
    with open(in_f,'r') as read_file:
        lines = read_file.readlines()
    with open(out_f,'w+') as write_file:
         #write_file.writelines(lines)
        print(lines)

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