Python基础练习-组织文件

原创

忆_恒心 2022-02-09 15:00:10 ©著作权

文章标签 Python基础练习-组织文件文件名 git python 文章分类 Python 后端开发

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前言：

需求：将（MM-DD-YYYYY）改成（DD-MM-YYYY）

项目：

检查当前工作目录的所有文件名，寻找美国风格的日期
如果找到，将改文件改名，交换月份和日期的位置，使之成为欧洲风格

具体实现：

创建一个正则表达式，可以识别到没过风格日期的文本模式
调用os.listdir()，找出工作目录中的所有文件
循环遍历每隔文件名，涌shutil.move()对改文件改名

#! 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)- # one or two digits for the day
    ((19|20)\d\d) # four digits for the year (must start with 19 or 20)
    (.*?)$ # 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