我是否总是需要在Python中指定我当前的工作目录？

I am working through the renameDates project in Automate the Boring stuff. It's supposed to match dates formated the American way and change them to the European format.

我正在通过自动化无聊的东西中的renameDates项目。它应该匹配形成美国方式的日期并将其更改为欧洲格式。

The thing I don't understand about this code is, how does it find the correct directory?

我对这段代码不了解的是,它如何找到正确的目录?

I can't find any code that sets the current working directory to the file I need it to work in, but the script seems written assuming the default current working directory is where it should work.

我找不到任何将当前工作目录设置为我需要它工作的文件的代码,但是脚本似乎是假定默认的当前工作目录应该在哪里工作。

Is it something simple like, running the script from the file I want to search for regular expressions in will make Python set that file as the CWD?

这是一个简单的事情,从我想搜索正则表达式的文件中运行脚本会使Python将该文件设置为CWD吗?

#! python3
# renameDates.py - renames filenames with American MM-DD-YYYY date format
# to European DD-MM-YYYY.

import shutil, os, re

# Create a regex that matches files with the American date format.
datePattern=re.compile(r"""^(.*?) # all text before the date
    ((0|1)?\d)-                 # one or two digits for the month
    ((0|1|2|3)?\d)-             # on or two digits for the day
    ((19|20)\d\d)               #four digits for the year
    (.*?)$                      # all text after the date
    """, re.VERBOSE)
# loop over the files in the working directory.
for amerFilename in os.listdir('.'):
    mo=datePattern.search(amerFilename)

    # Skip files without a date.
    if mo==none:
        continue

    # Get the different parts of the filename.
    beforePart=mo.group(1)
    monthPart=mo.group(2)
    dayPart=mo.group(4)
    yearPart=mo.group(6)
    afterPart=mo.group(8)

# Form the European-style filename.
euroFilename=beforePart+dayPart+'-'+monthPart+'-'+yearPart+afterPart


# Get the full, absolute file paths.
absWorkingDir=os.path.abspath('.')
amerFilename=os.path.join(absWorkingDir, amerFilename)
euroFilename=os.path.join(absWorkingDir, euroFilename)

# Rename the files.
print('Renaming "%s" to "%s%...' % (amerFilename, euroFilename))
#shutil.move(amerFilename,euroFilename)  #uncomment after testing

1 个解决方案

#1

Hey do you run your code from Terminal or interpreter? It uses the current working directory. Normaly it's the directory where you have been before starting the script / python interpreter... You can check your current working directory with this code... Hope this helps you:

嘿,你从终端或口译员运行你的代码?它使用当前的工作目录。 Normaly它是您在启动脚本/ python解释器之前的目录...您可以使用此代码检查当前的工作目录...希望这可以帮助您:

import os
print(os.getcwd())

You can change the working directory with:

您可以使用以下命令更改工作目录:

os.chdir(path)