python对文件的处理方法

#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")