Introduction

Setup

Operators

variable

String

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Lists

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if else statement

For Loop

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iterator & iterable

Pre-Built functions

Function

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Types of errors

Exceptions Handling

OOP

Regular expression

Create module

OS module

Date module

Random module

Math

Statistics module

Exercise 1

Exercise 2

Exercise 3

Learn Data Structure & Algorithm

Learn Numpy

Learn Pandas

Learn Matplotlib

Learn Seaborn

Learn Statistics

Learn Math

Learn MATLAB

Learn Machine learning

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Learn Deep Learning

Learn MySQL

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Learn Hadoop

Python os module

Python os module various operations

how to see current directory location?

Input
os.chdir("C:/Users/")
#chdir() function is used to change the current directory

print(os.getcwd())

How to see all the folders name present in the current directory?

Input
os.chdir("D:/")
print(os.listdir())
"""
listdir() function makes a list of the folder or files present in the current directory.
"""

How to create file or folder in a particular location?

To do this You have two functions:
1.makedirs():
If we want to create folder inside folder(like myfilder/subfol/main folder) then use this function.

2.mkdir():
If we simply want to create a folder then use this function. But we can also use makedirs() function to create a folder.

Input
os.chdir("D:/")
os.makedirs("my files/sub my files/main file")
print(os.listdir())
#os.mkdir("my files")

How to delete a file or folder?

Input
#To remove directory removedirs() function is used
os.chdir("D:/")
os.removedirs("my file/sub my file/main file")
print(os.listdir())

How to rename a folder or file?

Input
os.chdir("D:/") os.rename("my file","My_file") '''
In rename function, at first, we have to pass the current name and then the new name
'''
print(os.listdir())

How to get information about a folder or file?

Input
os.chdir("D:/")
print(os.stat("My_file"))
'''
This function will give we information(like file size, last modification time, etc) about the given file.
'''

How to get files or folder tree of a particular directory?

Suppose in E drive we have two folders. Inside these folders, we have some folders and files, and also inside these folders, we have some folders. Let's see that in E drive how many files or folders are present, the name of these folders or files, and folder location. To do this we will use for loop and walk() function. Inside of the walk function, we will pass the path.

Input
for current_dir_path,dir_name,filenames in os.walk("E:/"):
  print("Current path:",current_dir_path)
  print("Directories:",dir_name)
  print("Files:",filenames)
  print()

How to get environment variable?

Input
os.chdir("C:/User/HP/")
os.environ
'''
This will print all the environment variable names and locations.

We can get a particular environment variable using the get function. Inside get function to pass the variable name
'''
os.environ.get("My_env")

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