文件的操作

file文件使用流程：
1、打開文件 open("文件路徑",mode='')
2、操作文件 file.read() 、file.write()
3、關閉文件 file.close()

讀取 mode = 'r'

''' mode = 'r' read() readline() readlines() ''' file1_1 = open(r'D:\WorkSpace\function_folder\file01.txt', mode='r',encoding='utf-8') msg = file1_1.read() # 一個字一個字的讀取，直到讀完所有內容 print("文件的內容：", msg) file1_1.close()file1_2 = open(r'D:\WorkSpace\function_folder\file01.txt', mode='r',encoding='utf-8') msg = file1_2.readline(3) # 讀取指定的內容個數(shù) print("文件的內容：", msg) file1_2.close()file1_3 = open(r'D:\WorkSpace\function_folder\file01.txt', mode='r',encoding='utf-8') msg = file1_3.readlines() # 按行讀取，存入列表中 print("文件的內容：", msg) file1_3.close()

寫入 - 覆蓋型 mode = 'w'

file2 = open(r'D:\WorkSpace\function_folder\file01.txt', mode='w',encoding='utf-8') file2.write("---寫入的內容-----") file2.close()

寫入 - 追加型 mode = 'a'

file3 = open(r'D:\WorkSpace\function_folder\file01.txt', mode='a',encoding='utf-8') file3.write("---追加 寫入的內容-----") file3.close()

讀寫文件

mode = ‘r+’

open(“文件路徑”, mode=‘r+’,encoding=‘utf-8’)

file4 = open(r'D:\WorkSpace\function_folder\file01.txt', mode='r+',encoding='utf-8') # 讀 msg = file4.read() print("文件內容1：", msg) # 寫 file4.write("====讀寫文件操作1====") file4.close()

mode = ‘w+’

open(“文件路徑”, mode=‘w+’,encoding=‘utf-8’)

file5 = open(r'D:\WorkSpace\function_folder\file01.txt', mode='w+',encoding='utf-8') # 讀 msg = file5.read() print("文件內容2：", msg) # 讀取不到內容 因為w+的模式會清空文件 # 寫 file5.write("====讀寫文件操作2====") file5.close()

mode = ‘a(chǎn)+’

open(“文件路徑”, mode=‘a(chǎn)+’,encoding=‘utf-8’)

file6 = open(r'D:\WorkSpace\function_folder\file01.txt', mode='a+',encoding='utf-8') # 讀 file6.seek(0) # 將光標的位置移送到最開頭就可以讀取到了 msg = file6.read() print("文件內容3：", msg) # 讀取不到內容 因為a+模式，屬于追加文件內容，光標在文件末尾處 # 寫 file6.write("====讀寫文件操作3====") file6.close()

with as 操作文件

使用這個寫法就不用擔心忘記關閉文件了。如果在進行文件讀取操作的時候忘記關閉文件，你會發(fā)現(xiàn)文件會報錯或者出現(xiàn)亂碼，打不開的情況

with open(r'D:\WorkSpace\function_folder\file01.txt', mode='r',encoding='utf-8') as file:msg = file.read()print("with as 文件內容：", msg)

注意事項

報錯：UnicodeDecodeError: ‘gbk’ codec can’t decode byte 0xb9 in position 26: incomplete multibyte sequence
解決辦法：open("文件路徑",mode='',encoding='utf-8') 加入編碼格式即可

總結

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