Study Notes eight python

1. File Operations 
    Model housewife nurse teacher .txt 
    . 1, the file path: d: \ Model housewife nurse teacher .txt 
    2, encoding: UFT-GBK ..... 8 
    . 3, mode of operation: read-only, write-only, append, read, write, read 
        what encoding stored file, it operates to open what encoding 
    read-only: R & lt 
            RB 
        F = open ( 'log', mODE = 'R & lt', encoding = 'UTF-. 8') 
        Content = F .read () 
        Print (Content) 
        f.close () 

        F = Open ( 'log', MODE = 'RB') 
        Content reached, f.read = () 
        Print (Content) 
        f.close () 

    R & lt reader + 
        r + b read write (in bytes type) 
        F = Open ( 'log', mODE = 'r +', encoding = 'UTF-. 8') 
        Content reached, f.read = () 
        Print (Content) 
        f.write ( '\ I r + n-way written ')
        f.close()

        Open = F ( 'log', MODE = 'r + b') 
        Content reached, f.read = () 
        Print (Content) 
        f.write ( '\ I n-r + b writing mode' .encode ( 'utf- . 8 ')) 
        f.close () 

    write only: W 
            WB 
        content # clear first source file, write 
        F = Open (' log ', MODE =' W ', encoding =' UTF-. 8 ') 
        F. write ( 'I deleted previous content to write into') 
        f.close () 

        f = Open ( 'log', the MODE = 'wb') 
        f.write ( 'I write to delete previous content into 1'.encode ( 'UTF-. 8')) 
        f.close () 

        W + 
        F = Open ( 'log', MODE = '+ W', encoding = 'UTF-. 8') 
        f.write ( 'I to remove the preceding write contents into ') 
        f.seek (0) 
        Print (F.read())
        f.close()
        w+b
        Open = F ( 'log', MODE = 'W + B') 
        f.write ( 'I removed foregoing summary write into b'.encode + 1W (' UTF-. 8 ')) 
        f.seek (0) 
        Print (reached, f.read ()) 
        f.close () 

    append a 
        F = Open ( 'log', MODE = 'a', encoding = 'UTF-. 8') 
        f.write ( '\ n-I was added into the foregoing added ENTER ') 
        f.close () 

        F = Open (' log ', MODE =' ab & ') 
        f.write (' \ I was added n-go, preceded by a carriage return, bytes'.encode ( ' . 8-UTF ')) 
        f.close () 

2, encoding
　　

# Str ---> byte encode encoding 
# s = 'brother' 
# B = s.encode ( 'UTF-. 8') 
# Print (B) 
#byte ---> STR decode decoded 
# s1 = b.decode ( 'UTF-. 8') 
# Print (S1) 

# = S 'ADF' 
# B = s.encode ( 'UTF-. 8') 
# Print (B) 
# # #byte ---> STR decode decoded 
# s1 = b .decode ( 'GBK') 
# Print (s1) 

3, login, registration

username = input ( 'Please enter a user name you want to register:') 
password = the INPUT ( 'Please enter the password you want to register:') 
with Open ( 'list_of_info', the MODE = 'w', encoding = 'UTF-8 ') AS F: 
    f.write (' '. the format (username, password) {} \ {n-}) 
! Print (' Congratulations, registration is successful ') 

LIS = [] 
I =. 3 
the while I> 0: 
    USN = input ( 'enter your user name:') 
    pwd = input ( 'enter your password:') 
    with Open ( 'list_of_info', MODE = 'R & lt +', encoding = 'UTF-. 8') AS F1: 
        for in f1 Line: 
            lis.append (Line) 
    IF == USN LIS [0] .strip () and pwd == LIS [1] .strip (): 
        Print ( '! Login successful') 
        BREAK 
    the else: Print ( 'account ! or password is incorrect, you have a chance% s'% (i-1)) 
    i - = 1 

Code:

# f = open('d:\\123.txt',mode='r',encoding='utf-8')
# content = f.read()
# print(content)
# f.close()
# r
# f = open('log',mode='r',encoding='utf-8')
# content = f.read()
# print(content)
# f.close()

# f = open('log',mode='r+',encoding='utf-8')
# content = f.read()
# print(content)
# f.write('\n我是r+方式写入的')
# f.close()

# f = open('log',mode='r+b')
# content = f.read()
# print(content)
#f.write ( '\ n I r + b writing mode' .encode ( 'UTF-. 8')) 
# f.close () 

# RB 
# F = Open ( 'log', MODE = 'RB') 
# content reached, f.read = () 
# Print (content) 
# f.close () 

# contents clear first source file, write 
# F = Open ( 'log', MODE = 'W', encoding = 'UTF -8 ') 
# f.write (' I removed foregoing summary write into ') 
# f.close () 

# F = Open (' log ', MODE =' + W ', encoding =' UTF-. 8 ') 
# f.write ( 'I'd better go write delete the previous content') 
# f.seek (0) 
# Print (f.read ()) 
# f.close()

# wb
# f = open('log',mode='wb')
#f.write ( 'I removed foregoing summary write into 1'.encode (' UTF-. 8 ')) 
# f.close () 

# F = Open (' log ', MODE =' W + B ') 
# F .write ( 'I removed foregoing summary write into b'.encode + 1W (' UTF-. 8 ')) 
# f.seek (0) 
# Print (reached, f.read ()) 
# f.close () 

# a 
# F = Open ( 'log', MODE = 'a', encoding = 'UTF-. 8') 
# f.write ( '\ I was added n-go, preceded by a carriage return') 
# f.close () 

# ab & 
# F = Open ( 'log', MODE = 'ab &') 
# f.write ( '\ I was added n-go, preceded by a carriage return, bytes'.encode (' UTF-. 8 ')) 
# f.Close () 

# of Function 

# F = Open ( 'log', MODE = 'R & lt +', encoding = 'UTF-. 8') 
#print ( 'File name:', F.Name) 
# # reached, f.read Content = (. 3) are read out character # 
# f.seek (. 3) # of bytes is specified in accordance with the cursor position 
# # f.tell ( ) # tell you the cursor position, return int value 
# Print (f.tell ()) 
# Content reached, f.read = () 
# Print (Content) 
# f.readable () is readable # 
# Line = f.readline () # read line by line 
'' ' 
I = 0 
the while I <2: 
    I + =. 1 
    line = f.readline () 
    IF line: 
        Print (line.strip ()) 
    the else: BREAK 
' '' 

# line = f.readlines () # each line as a list of elements added to the list of 
'' ' 
Print (of the type (line), line) 
for li in line:
    print(type(li),li.strip())
'''
# f.truncate(20) # 在文件中取多少，就是多少，其他的删除

# for line in f:
#     print(line)
# f.close()

# f = open('log',mode='a+',encoding='utf-8')
# f.write('佳琪')
# count = f.tell()
# f.seek(count-count)
# print(f.read())
# f.close()
"""
with open('log',mode='r+',encoding='utf-8') as f,\
        open('log2',mode='a+',encoding='utf-8') as f1,open('log3',mode='a+',encoding='utf-8') as f3:
    # f.the Read () 
    # f1.seek (0)
    # f1.read ()
    # f.write ( 'I want to enter a carriage return')
    Print # (f1.read ()) 
    # f1.write ( 'I have to enter a carriage return') )
    # f.seek(0)
    # f1.seek(0)
    # f_1 = f.read () 
    # f_2 = f1.read () 
    # f3.truncate (0) 
    # F3. Write (F_1) 
    # f3.write ( '\ n-') 
    # f3.write (F_2) 
"" " 
with Open ( ' beauty .jpg ' , MODE = ' R & lt + B ' ) AS F1, \ 
        Open ( ' beauty 1 .jpg ' , MODE = ' R & lt + B ' ) AS F2, Open ( ' beauty 2.jpg ' , MODE = ' R & lt + B ' ) F3 AS:
     # F_1 = F1.read()
    # f_2 = f2.read()
    # f3.write(f_1+f_2)
    # f3.write(f_2)
    f3.seek(0)
    f1.seek(0)
    print(f3.read())
    print('\n')

    # print(f1.read())

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