Python 2.5.2：尝试以递归方式打开文件
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/2578022/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Python 2.5.2: trying to open files recursively
提问by ziiweb
The script below should open all the files inside the folder 'pruebaba' recursively but I get this error:
下面的脚本应该以递归方式打开文件夹“pruebaba”中的所有文件，但出现此错误：
Traceback (most recent call last):
File "/home/tirengarfio/Desktop/prueba.py", line 8, in f = open(file,'r') IOError: [Errno 21] Is a directory
回溯（最近一次调用最后一次）：
文件“/home/tirengarfio/Desktop/prueba.py”，第 8 行，在 f = open(file,'r') IOError: [Errno 21] 是一个目录
This is the hierarchy:
这是层次结构：
pruebaba
folder1
folder11
test1.php
folder12
test1.php
test2.php
folder2
test1.php
The script:
剧本：
import re,fileinput,os
path="/home/tirengarfio/Desktop/pruebaba"
os.chdir(path)
for file in os.listdir("."):
f = open(file,'r')
data = f.read()
data = re.sub(r'(\s*function\s+.*\s*{\s*)',
r'echo "The function starts here."',
data)
f.close()
f = open(file, 'w')
f.write(data)
f.close()
Any idea?
任何的想法？
回答by nosklo
Use os.walk. It recursively walks into directory and subdirectories, and already gives you separate variables for files and directories.
使用os.walk. 它递归地进入目录和子目录，并且已经为文件和目录提供了单独的变量。
import re
import os
from __future__ import with_statement
PATH = "/home/tirengarfio/Desktop/pruebaba"
for path, dirs, files in os.walk(PATH):
for filename in files:
fullpath = os.path.join(path, filename)
with open(fullpath, 'r') as f:
data = re.sub(r'(\s*function\s+.*\s*{\s*)',
r'echo "The function starts here."',
f.read())
with open(fullpath, 'w') as f:
f.write(data)
回答by Mark Rushakoff
You're trying to open everything you see. One thing you tried to open was a directory; you need to check if an entry is a fileor is a directory, and make a decision from there. (Was the error IOError: [Errno 21] Is a directorynot descriptive enough?)
你试图打开你看到的一切。您尝试打开的一件事是目录；您需要检查条目是文件还是目录，然后从那里做出决定。（错误IOError: [Errno 21] Is a directory描述性不够吗？）
If it isa directory, then you'll want to make a recursive call to your function to walk over the filesin that directory as well.
如果它是一个目录，那么您将需要对您的函数进行递归调用以遍历该目录中的文件。
Alternatively, you might be interested in the os.walkfunctionto take care of the recursive-ness for you.
或者，您可能对为您处理递归性的os.walk函数感兴趣。
回答by Wieland
os.listdir lists both files anddirectories. You should check if what you're trying to open really is a file with os.path.isfile
os.listdir 列出文件和目录。您应该检查您尝试打开的内容是否真的是一个带有os.path.isfile的文件
