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
我想应该是这样的。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)
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我来说两句