Python Tutorial

Introduction Python Features Python Applications System requirements for Python Python Installation Python Examples Python Basics Python Indentation Python Variables Python Data Types Python IDE Python Keywords Python Operators Python Comments Python Pass Statement

Python Conditional Statements

Python if Statement Python elif Statement Python If-else statement Python Switch Case

Python Loops

Python for loop Python while loop Python Break Statement Python Continue Statement Python Goto Statement

Python Arrays

Python Array Python Matrix

Python Strings

Python Strings Python Regex

Python Built-in Data Structure

Python Lists Python Tuples Python Lists vs Tuples Python Dictionary Python Sets

Python Functions

Python Function Python min() function Python max() function Python User-define Functions Python Built-in Functions Python Recursion Anonymous/Lambda Function in Python python apply() Function Python lambda() Function

Python File Handling

Python File Handling Python Read CSV Python Write CSV Python Read Excel Python Write Excel Python Read Text File Python Write Text File Read JSON File in Python

Python Exception Handling

Python Exception Handling Python Errors and exceptions Python Assert

Python OOPs Concept

OOPs Concepts in Python Classes & Objects in Python Inheritance in Python Polymorphism in Python Python Encapsulation Python Constructor Python Super function Python Static Method Static Variables in Python Abstraction in Python

Python Iterators

Iterators in Python Yield Statement In Python

Python Generators

Python Generator

Python Decorators

Python Decorator

Python Functions and Methods

Python Built-in Functions Python String Methods Python List Methods Python Dictionary Methods Python Tuple Methods Python Set Methods

Python Modules

Python Modules Python Datetime Module Python Math Module Python Import Module Python Time Module Python Random Module Python Calendar Module CSV Module in Python Python Subprocess Module Python Subprocess

Python MySQL

Python MySQL Python MySQL Client Update Operation Delete Operation Database Connection Creating new Database using Python MySQL Creating Tables Performing Transactions

Python MongoDB

Python MongoDB

Python SQLite

Python SQLite

Python Data Structure Implementation

Python Stack Python Queue Python Linked List Python Hash Table Python Graph

Python Advance Topics

Speech Recognition in Python Face Recognition in Python Python Linear regression Python Rest API Python Command Line Arguments Python JSON Python Virtual Environment Type Casting in Python Python Collections Python Commands Python Data Visualization Python Debugger Python DefaultDict Python Enumerate

Python 3

Anaconda in Python 3 Anaconda python 3 installation for windows 10 List Comprehension in Python3

Misc

Python PPTX Python Pickle Python Seaborn Python Coroutine Python EOL Python Infinity Python math.cos and math.acos function Python Project Ideas Based On Django Reverse a String in Python Reverse a Number in Python Python Word Tokenizer Python Trigonometric Functions Python try catch exception GUI Calculator in Python Implementing geometric shapes into the game in python Installing Packages in Python Python Try Except Python Sending Email Socket Programming in Python Python CGI Programming Python Data Structures Python abstract class Python Compiler Python K-Means Clustering NSE Tools In Python Operator Module In Python Palindrome In Python Permutations in Python Pillow Python introduction and setup Python Functionalities of Pillow Module Python Argmin Python whois Python JSON Schema Python lock Return Statement In Python Reverse a sentence In Python tell() function in Python Why learn Python? Write Dictionary to CSV in Python Write a String in Python Binary Search Visualization using Pygame in Python Latest Project Ideas using Python 2022 Closest Pair of Points in Python ComboBox in Python Python vs R Best resources to learn Numpy and Pandas in python Check Letter in a String Python Python Console Python Control Statements Convert Float to Int in Python using Pandas Difference between python list and tuple Importing Numpy in Pycharm Python Key Error Python NewLine Python tokens and character set Python Strong Number any() Keyword in python Best Database in Python Check whether dir is empty or not in python Comments in the Python Programming Language Convert int to Float in Python using Pandas Decision Tree Classification in Python End Parameter in python __GETITEM__ and __SETITEM__ in Python Python Namespace Python GUI Programming List Assignment Index out of Range in Python List Iteration in Python List Index out of Range Python for Loop List Subtract in Python Python Empty Tuple Python Escape Characters Sentence to python vector Slicing of a String in Python Executing Shell Commands in Python Genetic Algorithm in python Get index of element in array in python Looping through Data Frame in Python Syntax of Map function in Python After Python What Should I Learn Python AIOHTTP Alexa Python Artificial intelligence mini projects ideas in python Artificial intelligence mini projects with source code in Python Find whether the given stringnumber is palindrome or not First Unique Character in a String Python Python Network Programming Python Interface Python Multithreading Python Interpreter Data Distribution in python Flutter with tensor flow in python Front end in python Iterate a Dictionary in Python Iterate a Dictionary in Python – Part 2 Allocate a minimum number of pages in python Assertion Errors and Attribute Errors in Python Checking whether a String Contains a Set of Characters in python Python Control Flow Statements *Args and **Kwargs in Python Bar Plot in Python Conditional Expressions in Python Function annotations() in Python How to Write a Configuration file in Python Image to Text in python import() Function in Python Import py file in Python Multiple Linear Regression using Python Nested Tuple in Python Python String Negative Indexing Reading a File Line by Line in Python Python Comment Block Base Case in Recursive function python ER diagram of the Bank Management System in python Image to NumPy Arrays in Python NOT IN operator in Python One Liner If-Else Statements in Python Sklearn in Python Python Ternary Operators Self in Python Python vs Java Python Modulo Python Packages Python Syntax Python Uses Python Bitwise Operators Python Identifiers Python Matrix Multiplication Python AND Operator Python Logical Operators Python Multiprocessing Python Unit Testing __init__ in Python Advantages of Python Is Python Case-sensitive when Dealing with Identifiers Python Boolean Python Call Function Python History Python Image Processing Python main() function Python Permutations and Combinations Difference between Input() and raw_input() functions in Python Conditional Statements in python Confusion Matrix Visualization Python Python Algorithms Python Modules List Difference between Python 2 and Python 3 Is Python Case Sensitive Method Overloading in Python Python Arithmetic Operators Assignment Operators in Python Is Python Object Oriented Programming language Division in Python Python exit commands Continue And Pass Statements In Python Colors In Python Convert String Into Int In Python Convert String To Binary In Python Convert Uppercase To Lowercase In Python Convert XML To JSON In Python Converting Set To List In Python Covariance In Python CSV Module In Python Decision Tree In Python Difference Between Yield And Return In Python Dynamic Typing In Python

How to

How to Substring a String in Python How to Iterate through a Dictionary in Python How to convert integer to float in Python How to reverse a string in Python How to take input in Python How to install Python in Windows How to install Python in Ubuntu How to install PIP in Python How to call a function in Python How to download Python How to comment multiple lines in Python How to create a file in Python How to create a list in Python How to declare array in Python How to clear screen in Python How to convert string to list in Python How to take multiple inputs in Python How to write a program in Python How to compare two strings in Python How to create a dictionary in Python How to create an array in Python How to update Python How to compare two lists in Python How to concatenate two strings in Python How to print pattern in Python How to check data type in python How to slice a list in python How to implement classifiers in Python How To Print Colored Text in Python How to develop a game in python How to print in same line in python How to create a class in python How to find square root in python How to import numy in python How to import pandas in python How to uninstall python How to upgrade PIP in python How to append a string in python How to open a file in python How to Open a file in python with Path How to run a Python file in CMD How to change the names of Columns in Python How to Concat two Dataframes in Python How to Iterate a List in Python How to learn python Online How to Make an App with Python

Sorting

Python Sort List Sort Dictionary in Python Python sort() function Python Bubble Sort

Programs

Factorial Program in Python Prime Number Program in Python Fibonacci Series Program in Python Leap Year Program in Python Palindrome Program in Python Check Palindrome In Python Calculator Program in Python Armstrong Number Program in Python Python Program to add two numbers Anagram Program in Python Even Odd Program in Python GCD Program in Python Python Exit Program Python Program to check Leap Year Operator Overloading in Python Pointers in Python Python Not Equal Operator Raise Exception in Python Salary of Python Developers in India What is a Script in Python

Executing Shell Commands in Python

This tutorial aims to make us understand what a Shell is, what is the importance of a Shell, what are Shell commands in Python, and how can we execute the Shell commands in Python in detail. We will also see how we can write some basic Shell commands in Python programming language.

What is a Shell?

From a Programming Languages point of view, a shell is a software interface where it is mainly used for the functional testing of an operating system, and it can either be used in GUI (Graphical User Interface) or in CLI (Command Line Interface).

To be more precise, a Shell can be understood as a computer program that the human user uses directly to work with the operating system, either Windows, Linux or even Unix, to control the computer using the commands, not by selecting the pre-defined options as we generally do in Windows operating system for an instance creating a dictionary which will be equals to creating a directory using commands in Shell scripting using Python Programming here. In most cases, the Shell scripting is carried out using a Command Line Interface (CLI), not by a Graphical User Interface (GUI).

Importance of Shell Scripting?

A Shell Script is useful when we are creating the command sequences where the user has to input it repeatedly, which will save a lot of time for the users. In a similar way, the Shell Scripting can contain parameters, comments, sub commands and commands in the shell script by entering the file name or directory name on the command line interface.

How does the Shell Scripting work?

The Shell Scripting contains the ASCII value texting into it. These are written using a Text editor, word processor, or even using Graphical User Interface (GUI). The commands that we write in the command-line interface using the editor are written further written down in any one of the in-built programming languages, which are further interpreted by the shell itself. Some of the various functionalities that the shell can perform include variables if or else or then statements, looping, arrays and also some shortcuts in it.

Types of Shells that we generally use

  1. BASH (Bourne again shells) Scripting. The character for prompting of the bash scripting is a dollar symbol ($).
  2. C-shell scripting. The character for prompting of the C-shells scripting is a percentage symbol (%).

Modules in Python:

Following are the various modules in Python that the shell scripting can work:

  1. OS
  2. Platform
  3. Sub-processes
  4. Shutils
  5. Glob
  6. sys

Shell Commands in Python

See the below code or scripting commands for printing a few statements using the shell scripting

Code:

import os


os. system("echo Hello from the other side of the world to you people!")

Output:

Hello from the other side of the world to you people!

Code:

#First statement is Importing the required module
import os


#We will be Using the system() method to
# execute shell commands
os.system('echo "JAVA T POINT"')

Output:

JAVA T POINT


Code to create a new file called codes.py
import os


home_dir = os.system("cd ~")
print("`cd ~` ran with exit code %d" % home_dir)
unknown_dir = os.system("cd doesnotexist")
print("`cd doesnotexis` ran with exit code %d" % unknown_dir)

Output:

$ python3 codes.py

Using the Subprocess Module

The subprocess module provides us with powerful facilities to spawn new processes and also to retrieve the results. Using the sub-processes module is very much preferable for the function.

Code:

import subprocess
process = subprocess.Popen(['echo', 'More output in the window'],
                     stdout=subprocess.PIPE, 
                     stderr=subprocess.PIPE)
stdout, stderr = process.communicate()
stdout, stderr

Output:

(b'More output in the window\n', b'')

OS Module:

Some of the basic shell commands using the OS module using Python Programming Language. This is one of the native approaches to interacting with the operating system to run the shell command.

Before executing any command, we have to create any file; for instance, we are creating a sample file named os_sample_file.py before executing the below shell commands.

Code:

import os


os.system('date')

Output

$ python shell_command.py
WED July 13 12:33:23 GMT 2022

Code:

import os
output = os.popen('date')
type(output)
<class 'os._wrap_close'>
print(output.__dict__)
{'_stream': <_io.TextIOWrapper name=3 encoding='UTF-8'>, '_proc': }         
output.read()
' WED July 13 12:33:23 GMT 2022\n'

Output Window:

output.read()


import os
print(os.popen('date').read())
WED July 13 12:33:23 GMT 2022



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