如何使用Python将一个文件分成两个文件? [英] How do I split one file into two files using Python?

问题描述

我有一个包含一些代码行和一个字符串模式的文件.我需要在文件1中包含字符串模式的行之前写入所有内容，在文件2中包含字符串模式的行之后写入所有内容:

I have a file containing some lines of code followed by a string pattern. I need to write everything before the line containing the string pattern in file one and everything after the string pattern in file two:

例如(文件内容)

• 代码行1
• 代码行2
• 字符串模式
• 代码行3

输出应该是带有代码行1的文件1和带有代码行3的文件2.

The output should be file one with codeline 1, codeline 2 and file two with codeline 3.

我熟悉编写文件，但是不幸的是，我不知道如何确定字符串模式前后的内容.

I am familiar with writing files, but unfortunately I do not know how to determine the content before and after the string pattern.

推荐答案

如果输入文件适合内存，最简单的解决方案是使用str.partition():

If the input file fits into memory, the easiest solution is to use str.partition():

with open("inputfile") as f:
    contents1, sentinel, contents2 = f.read().partition("Sentinel text\n")
with open("outputfile1", "w") as f:
    f.write(contents1)
with open("outputfile2", "w") as f:
    f.write(contents2)

这假设您知道分隔两部分的行的确切文本.

This assumes that you know the exact text of the line separating the two parts.

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