# 一次性读取文件

f = open("test.txt",'r',encoding='gbk')

data = f.read()

print(data)
f.close()

# 按行读取

f = open("test.txt",'r',encoding='gbk')

data = f.readline()

print(data,end='')
f.close()

# 循环读取

f = open("test.txt",'r',encoding='gbk')

for line in f:

    print(line,end='')
f.close()

# 循环读取二

f = open('test.txt','r',encoding='gbk')

data = f.readlines()

for line in data:

    print(line)

# 二进制读取

f = open("test.txt",'rb')

data = f.read()

print(data.decode('gbk'))
f.close()

# 按字节读取

f = open("test.txt",'r',encoding='gbk')

data = f.read(1)

print(data)
f.close()

f = open("test.txt",'r',encoding='gbk')

data = f.readline(2)

print(data)
f.close()

# 清空原内容写入

f = open('test.txt','w',encoding='gbk')

f.wirte('新内容，新世界')

f.close()   # 关闭并保存

# 清空原内容写入

f = open('test.txt','a',encoding='gbk')

f.wirte('新内容，新世界')

f.close()   # 关闭并保存

# 清空原内容写入

f = open('test.txt','wb')

f.wirte('新内容，新世界'.encode('gbk'))

f.close()   # 关闭并保存

# flush强刷保存内容

f = open('test2.txt','w',encoding='gbk')

f.write('新内容，新世界3')

f.flush()  #保存内容

#f.close()

# 一次性修改

f = open("test.txt",'r+',encoding='gbk')

data = f.read()

f.seek(0)

f.truncate()

data = data.replace('Zi','子')

f.write(data)

f.close()

# 边读边改

import os

f_name = "test.txt"

f_temp_name = "test_temp.txt"

f = open(f_name,'r',encoding='gbk')

f_temp = open(f_temp_name,'w',encoding='gbk')

for line in f:

    f_temp.write(line.replace('子','Zi'))

f.close()

f_temp.close()

os.replace(f_temp_name,f_name)