obj = open('路径',mode='模式',encoding='编码')

obj.write()  # 写入

obj.read()   # 读取

obj.close()  #关闭

r / w / a 【只读只写字符串】

r+ / w+ / a+ 【可读可写字符串】

rb / wb / ab 【只读只写二进制】

r+b / w+b / a+b 【可读可写二进制】

read() , 全部读到内存

read(1)

1表示一个字符

obj = open('a.txt',mode='r',encoding='utf-8')

data = obj.read(1) # 1个字符

obj.close()

print(data)

1表示一个字节

obj = open('a.txt',mode='rb')

data = obj.read(3) # 1个字节

obj.close()

write(字符串)

obj = open('a.txt',mode='w',encoding='utf-8')

obj.write('中午你')

obj.close()

write(二进制)

obj = open('a.txt',mode='wb')

# obj.write('中午你'.encode('utf-8'))

v = '中午你'.encode('utf-8')

obj.write(v)

obj.close()

seek(光标字节位置)，无论模式是否带b，都是按照字节进行处理。

obj = open('a.txt',mode='r',encoding='utf-8')

obj.seek(3) # 跳转到指定字节位置

data = obj.read()

obj.close()

print(data)

obj = open('a.txt',mode='rb')

obj.seek(3) # 跳转到指定字节位置

data = obj.read()

obj.close()

print(data)

tell(), 获取光标当前所在的字节位置

obj = open('a.txt',mode='rb')

# obj.seek(3) # 跳转到指定字节位置

obj.read()

data = obj.tell()

print(data)

obj.close()

flush，强制将内存中的数据写入到硬盘

v = open('a.txt',mode='a',encoding='utf-8')

while True:

    val = input('请输入：')

    v.write(val)

    v.flush()

v.close()

v = open('a.txt',mode='a',encoding='utf-8')

v.close()

with open('a.txt',mode='a',encoding='utf-8') as v:

    data = v.read()

    # 缩进中的代码执行完毕后，自动关闭文件

with open('a.txt',mode='r',encoding='utf-8') as f1:

    data = f1.read()

new_data = data.replace('飞洒','666')

with open('a.txt',mode='w',encoding='utf-8') as f1:

    data = f1.write(new_data)

f1 = open('a.txt',mode='r',encoding='utf-8')

f2 = open('b.txt',mode='w',encoding='utf-8')

for line in f1:

    new_line = line.replace('阿斯','死啊')

    f2.write(new_line)

f1.close()

f2.close()

with open('a.txt',mode='r',encoding='utf-8') as f1, open('c.txt',mode='w',encoding='utf-8') as f2:

    for line in f1:

        new_line = line.replace('阿斯', '死啊')

        f2.write(new_line)