開發與維運

文件拷貝

本文來自於千鋒教育在阿里雲開發者社區學習中心上線課程《Python入門2020最新大課》,主講人姜偉。

文件拷貝

import os
file_name = input('請輸入一個文件路徑:')  # sss.txt==> sss.bak.txt

if os.path.isfile(file_name):  # 判斷是否是文件
    # 打開舊文件
    old_file = open(file_name, encoding='utf8')

    # sss.txt ==> sss.bak.txt
    # 'sss' + 'bak' + 'txt'
    # names = file_name.rpartition('.')  # ('sss', '.', 'txt')
    # new_file_name = names[0] + '.bak.' + names[2]
   
    names = os.path.splutext(file_name)  # ('xxx', '.txt')
    new_file_name = names[0] + '.bak' + names[1]
    new_file_name = 'test.txt'
    new_file = open(new_file_name, 'w', encoding='utf8')  # 打開一個新的文件用於寫入

    # 把舊文件的數據讀取出來寫到新文件
    new_file.write(old_file.read())


    new_file.close()
    old_file.close()
else:
    print('您輸入的文件不存在')

優化:

import os
file_name = input('請輸入一個文件路徑:') 
if os.path.isfile(file_name):  
    old_file = open(file_name, 'rb')
    names = os.path.splutext(file_name)  

    new_file_name = names[0] + '.bak' + names[1]
    new_file = open(new_file_name, 'wb') 
    
    while True:
        content = old_file.read(1024)    # 讀取出來的內容是二進制 
        new_file.write(content)
        if not content:
            break

    new_file.close()
    old_file.close()
else:
    print('您輸入的文件不存在')

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