Python file operation

Open\create file

In python, using the open function, you can open an existing file or create a new file. By default, the new file is created in the folder where the current program is located.

Format: open (file name, access mode), for example

f =open('test.txt','w') #Open the file in write mode, create a new file if it does not exist

If you do not specify the mode when creating a new file, the default is to read mode, but if the new file does not exist, an error will be reported.

# Write
'''
f =open('test.txt','w') #Open the file in write mode, create a new file if it does not exist

f.write("hello python") #Write string to file

f.close() #Close the file operation every time
'''

'''
# Read, read method, read the specified character, locate at the head of the file at the beginning, move backward the specified number of characters each time it is executed
f =open("test.txt","r")

str = f.read(5) #Specify five characters to read
print(str)

str = f.read(5) #Read five more characters, use the file pointer, read backwards in turn, not every time from the beginning
print(str)

f.close()'''

# Read, readline()、readlines()method
f =open("test.txt","r")

# str = f.readline() #Starting from the first line, read only one line at a time
# print(str)
#
# str = f.readline() #Read one more line down
# print(str)

strs = f.readlines() #Read all rows. Output as a list, with each row as an element in the list
# Use enumeration to output the line number of each line
for num,str inenumerate(strs):print("First%d line:%s"%(num+1,str))

f.close()

File Rename##

The rename() in the os library can complete the renaming of files.
Format: rename (the file name to be modified, the new file name)

import os
os.rename("Graduation thesis.txt","Graduation thesis-final version.txt")|

Delete Files##

The remove() in the os module can complete the file deletion operation
Format: remove (the file name to be deleted)

import os
os.remove("Graduation thesis.txt")

Create\Delete Folder##

import os
os.mkdir("Directory name")
os.rmdir("Directory name")

Get the current directory##

import os 
os.getcwd()