python对文件的处理方法

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#1、打开文件 如果文件不存在会报错 file = open("1.txt")   #2、使用w、w+、a、a+模式打开，如果文件不存在就创建文件 file = open("1.txt", "w")   #3、指定绝对路径路径 file = open("D:\\1.txt", "w")   #二进制模式打开图片或者视频 file = open("老虎头像.png", "rb") print(file)   #指定字符集打开文件 file = open("csv群聊.csv", "r", encoding='utf-8') #关闭文件 file.close()   #写入文件 复写 file = open("1.txt","w") file.write("1111你好")   #写入文件 追加 file = open("1.txt","a") file.write("123123")   # 打开文件 读取前9字符串 file = open("messages.txt", "r", encoding='utf-8') string = file.read(9) print(string)   #想要从文件的第6个字符开始读取2个字符 file = open("messages.txt", "r", encoding='utf-8') file.seek(5) # 移动指针到新的位置 string = file.read(2) # 读取2个字符 print(string)   #读取一行 print("\n", "=" * 20, "Python经典应用", "=" * 20) with open1("messages.txt", "r", encoding="utf-8") as file:     number = 0  # 记录行号     while True:         number += 1         line = file.readline()         if line == "":             break         print(number, line, end="\n") print("\n ", "=" * 20, "over" * 20, "\n")   #读取一行并将内容分割 print("\n", "=" * 20, "Python经典应用", "=" * 20) with open2("csv群聊.csv", "r", encoding="utf-8") as file:     number = 0  # 记录行号     while True:         number += 1         line = file.readline()           if line == "":             break         else:             print(number, line, end="\n")             lst = line.split('  ')#使用空字符串分割             for i in range(len(lst)):                 print(i, lst[i])   print("\n ", "=" * 20, "over" * 20, "\n")   #读取全部行 一次性输出 print("\n", "=" * 20, "Python经典应用", "=" * 20) with open3("messages.txt", "r", encoding="utf-8") as file:     message = file.readlines()  # 读取全部信息     print(message)     print("\n ", "=" * 20, "over", "=" * 20, "\n")   # 读取全部行  将列表的内容逐行输出 print("\n", "=" * 20, "Python经典应用", "=" * 20) with open4("messages.txt", "r", encoding="utf-8") as file:     messageall = file.readlines()  # 读取全部信息     for message in messageall:         print(message)  # 输出一条信息 print("\n ", "=" * 20, "over", "=" * 20, "\n")