Review 09 file operations

Review the lesson # 
# File 
    # open file 
        #open ( 'path', 'Open', 'specify the encoding') 
        # Open W + A + R & lt RWA RB + WB + + + ab & 
        # recommended that only one operation. When read only write read and write only when additional time is added only 
    # operation file 
        # read 
            #read one-time # read file is too large easily burst 
            #readline line by line read # # do not know where the end of the video image type in accordance with the type of byte read can not read in rows 
            # memory is full-time reading will easily burst memory #readlines, 

            #for cycle time is the best way! 
        # Write 
            #write line method to write write write directly newline \ the n- 
            # ==== professional cursor called the file pointer 
                #seek move the cursor to a specified location 
                #tell get the current cursor location 
                #truncate intercept file 
# modified file 
    # file is use a special method can not be modified to modify the 
# file is modified #open operating system file system is built-in functions instead of python function
# Default operating system is GBK encoding all encoding must not specify omitted encoding 
modified # file read a write a puncturing a rename 
with open ( 'log', encoding = 'utf-8') as f, open ( " log.bak "," w "encoding =" UTF-8 ") AS f2: 
    for i in f: 
        IF 'things' in i: 
            i = i.replace (" things "," strange ") 
            # write file 
        f2 .write (i) 
# delete files and rename files 
Import os 
os.remove ( 'log') # delete files 
os.rename ( 'log.bak', 'log ') # renaming files