Introduction to Python file operations (code examples)

The content of this article is an introduction to relevant knowledge about Python file operations (code examples). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

1. File operation

1-1 Traverse folders and files

import os
rootDir = "/path/to/root"

for parent, dirnames, filenames in os.walk(rootDir):
    for dirname in dirnames:
        print("parent is:" + parent)
        print("dirname is:" + dirname)
    
    for filename in filenames:
        print("parent is:" + parent)
        print("filename is:" + filename)
        print("the full name of the file is:" + os.path.join(parent, filename))

1-2 Get the file name and extension

import os
path = "/root/to/filename.txt"
name, ext = os.path.splitext(path)
print(name, ext)
print(os.path.dirname(path))
print(os.path.basename(path))

1-3 Read the text file content line by line

f = open("/path/to/file.txt")

# The first method
line = f.readline()
while line:
    print(line)
    line = f.readline()
f.close()

# The second method
for line in open("/path/to/file.txt"):
    print(line)

# The third method
lines = f.readlines()
for line in lines:
    print(line)

1-4 Write the file

output = open("/path/to/file", "w")
# output = open("/path/to/file", "w+")

output.write(all_the_text)
# output.writelines(list_of_text_strings)

1-5 Determine whether the file exists

import os

os.path.exists("/path/to/file")
os.path.exists("/path/to/dir")

# Only check file
os.path.isfile("/path/to/file")

1-6 Create the file Clip

import os

# Make multilayer directorys
os.makedirs("/path/to/dir")

# Make single directory
os.makedir("/path/to/dir")

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