我想遍历文本文件的内容，进行搜索并替换某些行，然后将结果写回到文件中。我可以先将整个文件加载到内存中，然后再写回去，但这可能不是最好的方法。
在以下代码中，执行此操作的最佳方法是什么？
f = open(file) for line in f: if line.contains('foo'): newline = line.replace('foo', 'bar') # how to write this newline back to the file
我想类似的事情应该做。它基本上将内容写入新文件，并用新文件替换旧文件：
from tempfile import mkstemp from shutil import move, copymode from os import fdopen, remove def replace(file_path, pattern, subst): #Create temp file fh, abs_path = mkstemp() with fdopen(fh,'w') as new_file: with open(file_path) as old_file: for line in old_file: new_file.write(line.replace(pattern, subst)) #Copy the file permissions from the old file to the new file copymode(file_path, abs_path) #Remove original file remove(file_path) #Move new file move(abs_path, file_path)
