Python9-文件操作-day8

# 1、文件路径：d:\xxx.txt
# 绝对路径：从根目录开始
# 想对路径：当前文件下
# 2、编码方式：utf-8/gbk...
# 3、操作方式：只读。只写。追加、读写、写读.....

f=open('d:\mod.txt',mode='r',encoding='utf-8')

content=f.read()

print(content)

f.close()

# byte类型：rb

# byte类型：rb

f=open('公共',mode='rb')

content=f.read()

print(content)

f.close()

b'\xe5\x93\x88\xe5\x93\x88\xe5\x93\x88\xe5\x93\x88'

#只写：w

f=open('log',mode='w',encoding='utf-8')

f.write('骑兵步兵')

f.close()

#现将源文件的内容删除，再写

f=open('log',mode='w',encoding='utf-8')

f.write('快看看')

f.close()

#wb

f=open('log',mode='wb')

f.write('快看看'.encode('utf-8'))

f.close()

追加

#追加

f=open('log',mode='a',encoding='utf-8')

f.write('骑兵步兵')

f.close()

#ab

f=open('log',mode='ab')

f.write('骑兵步兵'.encode('utf-8'))

f.close()

#读写

f=open('log',mode='r+',encoding='utf-8')

content=f.read()

print(content)

f.write('big,small')

f.close()

#写读

f=open('log',mode='r+',encoding='utf-8')

f.write('python9')

content=f.read()

print(content)

f.close()

f=open('log',mode='r+b')

content=f.read()

print(content)

f.write('python9'.encode('utf-8'))

f.close()

#写读w+

f=open('log',mode='w+',encoding='utf-8')

f.write('python9')

print(f.read())

f.close()

#写读a+

f=open('log',mode='a+',encoding='utf-8')

f.write('bbbbb')

f.seek(0)

print(f.read())

f.close()

read

f=open('log',mode='r+',encoding='utf-8')

content=f.read(4)

print(content)

f.close()

f=open('log',mode='r+',encoding='utf-8')

# content=f.read(4) #read是按照字符定光标位置

f.seek(6)  #seek是按照字节定光标位置的3/6/9.  一个中文是3个字节

content=f.read()

print(content)

f.close()

光标位置

f=open('log',mode='r+',encoding='utf-8')

f.seek(3)

print(f.tell()) #告诉你光标位置

# content=f.read()

# print(content)

f.close()

f=open('log',mode='a+',encoding='utf-8')

f.write('啥地方')

count = f.tell()

f.seek(count-9)

content=f.read()

print(content)

f.close()

f=open('log',mode='r+',encoding='utf-8')

print(f.readable())  #是否可读

print(f.writable())  #是否可写

line = f.readline()  #一行一行读

line = f.readlines()  #每一行当成列表中的一个元素，然后添加到列表中

f.truncate(2)   #对原文件进行截取

print(line)

f.close()

循环

f=open('log',mode='r+',encoding='utf-8')

for i in f:

    print(i)

f.close()

with

with open('log',mode='r+',encoding='utf-8') as f,\

        open('log',mode='r+',encoding='utf-8') as f1:

    print(f.read(1))

#三次登录验证
# 注册的用户名和密码写入到文件，打印，进入界面登录，
# 三次登录，从文件中读取用户名和密码验证

username = input("Register your username: ")

password = input("Register you password: ")

with open('register',mode='w',encoding='utf-8') as reg:

    reg.write('{}\n{}'.format(username,password))

print('恭喜你，注册成功！！！！')

lis = []

i = 0

while i < 3:

    usn =  input("pls your username: ")

    pwd =  input("pls your password: ")

    with open('register',mode='r+',encoding='utf-8') as reg1:

        for line in reg1:

            lis.append(line)

    if usn == lis[0].strip() and pwd == lis[1].strip():

        print('登录成功！！！')

        break

    else:print('密码错误！！！！！！')

    i+=1

str --->byte  encode 编码
s = '二哥'
b = s.encode('utf-8')
print(b)
#byte --->str decode 解码
s1 = b.decode('utf-8')
print(s1)

s = 'abf'
b = s.encode('utf-8')
print(b)
#byte --->str decode 解码
s1 = b.decode('gbk')
print(s1)

巴特西

Python9-文件操作-day8

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