Python Programming Training Certification
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Course Overview
Python is one of the world’s top programming languages used today and Python training has become the most popular training across individuals. Training Basket’s Python Training & Certification course covers basic and advanced Python concepts and how to apply them in real-world applications.Python is a flexible and powerful open-source language that is easy to learn and consists of powerful libraries for data analysis and manipulation. Our Python training course content is curated by experts as per the standard Industry curriculum. The curriculum, coding challenges and real-life problems cover data operations in Python, strings, conditional statements, error handling, shell scripting, web scraping and the commonly used Python web framework Django. Take this Python training and certification course and become job-ready now.
Python OS Module
Python OS module provides the facility to establish the interaction between the user and the operating system. It offers many useful OS functions that are used to perform OS-based tasks and get related information about operating system.
The OS comes under Python’s standard utility modules. This module offers a portable way of using operating system dependent functionality.
The Python OS module lets us work with the files and directories.
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To work with the OS module, we need to import the OS module.
import os
There are some functions in the OS module which are given below:
os.name()
This function provides the name of the operating system module that it imports.
Currently, it registers ‘posix’, ‘nt’, ‘os2’, ‘ce’, ‘java’ and ‘riscos’.
Example
-
import os
print(os.name)
Output:
- nt
os.mkdir()
The os.mkdir() function is used to create new directory. Consider the following example.
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import os
os.mkdir(“d:\\newdir”)
It will create the new directory to the path in the string argument of the function in the D drive named folder newdir.
os.getcwd()
It returns the current working directory(CWD) of the file.
Example
-
import os
print(os.getcwd())
Output:
- C:\Users\Python\Desktop\ModuleOS
os.chdir()
The os module provides the chdir() function to change the current working directory.
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import os
os.chdir(“d:\\”)
Output:
- d:\\
os.rmdir()
The rmdir() function removes the specified directory with an absolute or related path. First, we have to change the current working directory and remove the folder.
Example
-
import os
# It will throw a Permission error; that’s why we have to change the current working directory.
os.rmdir(“d:\\newdir”)
os.chdir(“..”)
os.rmdir(“newdir”)
os.error()
The os.error() function defines the OS level errors. It raises OSError in case of invalid or inaccessible file names and path etc.
Example
-
import os
try:
# If file does not exist,
# then it throw an IOError
filename = ‘Python.txt’
f = open(filename, ‘rU’)
text = f.read()
f.close()# The Control jumps directly to here if
# any lines throws IOError.
except IOError:# print(os.error) will <class ‘OSError’>
print(‘Problem reading: ‘ + filename)
Output:
- Problem reading: Python.txt
os.popen()
This function opens a file or from the command specified, and it returns a file object which is connected to a pipe.
Example
-
import os
fd = “python.txt”# popen() is similar to open()
file = open(fd, ‘w’)
file.write(“This is awesome”)
file.close()
file = open(fd, ‘r’)
text = file.read()
print(text)# popen() provides gateway and accesses the file directly
file = os.popen(fd, ‘w’)
file.write(“This is awesome”)
# File not closed, shown in next function.
Output:
- This is awesome
os.close()
This function closes the associated file with descriptor fr.
Example
-
import os
fr = “Python1.txt”
file = open(fr, ‘r’)
text = file.read()
print(text)
os.close(file)
Output:
-
Traceback (most recent call last):
File “main.py”, line 3, in
file = open(fr, ‘r’)
FileNotFoundError: [Errno 2] No such file or directory: ‘Python1.txt’
os.rename()
A file or directory can be renamed by using the function os.rename(). A user can rename the file if it has privilege to change the file.
Example
-
import os
fd = “python.txt”
os.rename(fd,’Python1.txt’)
os.rename(fd,’Python1.txt’)
Output:
-
Traceback (most recent call last):
File “main.py”, line 3, in
os.rename(fd,’Python1.txt’)
FileNotFoundError: [Errno 2] No such file or directory: ‘python.txt’ -> ‘Python1.txt’
os.access()
This function uses real uid/gid to test if the invoking user has access to the path.
Example
-
import os
import syspath1 = os.access(“Python.txt”, os.F_OK)
print(“Exist path:”, path1)# Checking access with os.R_OK
patstrong = os.access(“Python.txt”, os.R_OK)
print(“It access to read the file:”, patstrong)# Checking access with os.W_OK
path3 = os.access(“Python.txt”, os.W_OK)
print(“It access to write the file:”, path3)# Checking access with os.X_OK
path4 = os.access(“Python.txt”, os.X_OK)
print(“Check if path can be executed:”, path4)
Output:
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Exist path: False
It access to read the file: False
It access to write the file: False
Check if path can be executed: False
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