python basis (xiv) - File operations

1, file operations.
    Model housewife nurse teacher .txt
    . 1, the file path: d: \ Model housewife nurse teacher .txt
    2, encoding: utf-8 gbk. . . .
    3, Operation: read-only, write-only, append, read, write, read .....
        what encoding the file is stored, it is open to any coding operation.

    Read-only: R & lt
          RB
        F = Open ( 'Model class housewife nurses', MODE = 'R & lt', encoding = 'UTF-. 8')
        Content reached, f.read = ()
        Print (Content, type (Content))
        f.close ( )

        # F = open ( 'Model class housewife nurses', MODE = 'RB',)
        # reached, f.read Content = ()
        # Print (Content)
        # f.close ()

        write r +
        r + B read (in bytes type)
        # = F Open ( 'log', MODE = 'r +', encoding = 'UTF-. 8')
        # Print (reached, f.read ())
        # f.write ( 'big Meng Meng')
        # f.close ()

        f = open('log',mode='r+b')
        print(f.read())
        f.write('大猛，小孟'.encode('utf-8'))
        f.close()

    Write only: w
          wb
    content # source file first clear, in writing.
    Open F = # ( 'log', MODE = 'W', encoding = 'UTF-. 8')
    # f.write ( 'seen near similar disputes')
    # f.close ()

    f = open('log',mode='wb')
    f.write('附近看到类似纠纷'.encode('utf-8'))
    f.close()
    w+
    # f = open('log',mode='w+',encoding='utf-8')
    # f.write('aaa')
    # f.seek(0)
    # print(f.read())
    # f.close()
    w+b
    .......

    追加
        # f = open('log',mode='a',encoding='utf-8')
        # f.write('佳琪')
        # f.close()

        # f = open('log',mode='ab')
        # f.write('佳琪'.encode('utf-8'))
        # f.close()

 

 

Absolute path #
# f = open ( 'd: \ Model class housewife nurse .txt', MODE = 'R & lt', encoding = 'UTF-. 8')
# reached, f.read Content = ()
# Print (Content)
# F. close ()

---- #Bytes in> STR
# F = Open ( 'Model class housewife nurses', MODE = 'R & lt', encoding = 'UTF-. 8')
# reached, f.read Content = ()
# f.write ( 'fjsdlk' )
# f.close ()

# F = open ( 'Model class housewife nurses', MODE =' RB ',)
# reached, f.read Content = ()
# Print (Content)
# f.close ()
# f = open (' log ', MODE =' + R & lt ', encoding =' UTF-. 8 ')
# Print (reached, f.read ())
# f.close ()

# f = open('log',mode='r+b')
# print(f.read())
# f.write('大猛，小孟'.encode('utf-8'))
# f.close()

 

For # w: This file will not create a file
# F = Open ( 'log', MODE = 'W', encoding = 'UTF-. 8')
# f.write ( 'cavalry infantry')
# f.close ()

# Source file contents first clear, in writing.
Open F = # ( 'log', MODE = 'W', encoding = 'UTF-. 8')
# f.write ( 'seen near similar disputes')
# f.close ()

# f = open('log',mode='w+',encoding='utf-8')
# f.write('aaa')
# f.seek(0)
# print(f.read())
# f.close()

Open F = # ( 'log', MODE = 'WB')
# f.write ( 'seen near similar disputes' .encode ( 'UTF-. 8'))
# f.close ()

# f = open('log',mode='a',encoding='utf-8')
# f.write('佳琪')
# f.close()
#
# f = open('log',mode='a',encoding='utf-8')
# f.write('佳琪')
# f.close()

 

# f = open('log',mode='a+',encoding='utf-8')
# f.write('佳琪')
# f.seek(0)
# print(f.read())
# f.close()

# f = open('log',mode='ab')
# f.write('佳琪'.encode('utf-8'))
# f.close()

# Detailed features

Open obj = # ( 'log', MODE = 'R & lt +', encoding = 'UTF-. 8')
# reached, f.read Content = (. 3) are read out character #
# f.seek (3) # accordance with the word section set the cursor position
# f.tell () to tell you the cursor position
# Print (f.tell ())
# f.read Content = ()
# Print (Content)
# f.tell ()
# f.readable () # whether scale
# line = f.readline () # read line by line
# line = f.readlines () # each line as an element in the list is added to the list
# f.truncate (. 4)
# for line F in :
# Print (Line)
# f.close ()

 

 

 

# f = open('log',mode='a+',encoding='utf-8')
# f.write('佳琪')
# count = f.tell()
# f.seek(count-9)
# print(f.read(2))
# f.close()

# with open('log',mode='r+',encoding='utf-8') as f,\
#         open('log',mode='w+',encoding='utf-8') as f1:

 

the INPUT = username ( ' 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',mode='w',encoding='utf-8') as f:
    f.write ( ' {} \ {} the n- ' .format (username, password))
 Print ( ' Congratulations, successfully registered ' )
lis = []
i = 0
while i < 3:
    USN = the INPUT ( ' Please enter your user name: ' )
    pwd = the INPUT ( ' Please enter your password: ' )
    with open('list_of_info',mode='r+',encoding='utf-8') as f1:
        for line in f1:
            lis.append(line)
    IF USN == LIS [0] .strip () and pwd == LIS [1 ] .strip ():
         Print ( ' Login successful ' )
         BREAK 
    the else : Print ( ' account and password error ' )
    i+=1

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

 

 

 

Review content

# File
    # open file
        #open ( 'path', 'Open', 'specify the encoding')
        # Open W + A + R & lt RWA B +
            # + R & lt open file read and write directly write
        # encoding - utf- 8
    # operation file
        # read
            # read a one-time reading
            # readlines one-time reading
            # readline read line by line
                # does not know where the end of the
                # video pictures rb bytes in bytes read
            # for loop - the best! ! !
        # Write
            # the Write
        # cursor - file pointer
            #seek _ Move the cursor to a specified location
            #tell _ get the current cursor position
            #truncate _ intercepted file
    # close the file
        #close

# Modify the file
with open ( 'Nurse teacher', encoding = 'utf-8 ') as f, open ( ' class Nurse .bak', 'W', encoding = 'UTF-. 8') AS F2:
    for Line f in:
        IF 'star child' in line: # teacher: child star
            line = line.replace ( 'star children', 'ah Johnson')
        # write file
        f2.write (line) # nurse: Golden boss

os Import
os.remove ( 'Nurse teacher') # delete files
os.rename ( 'Nurse teacher .bak', 'Nurse teacher') # renaming files