{"id":2597,"date":"2022-02-03T12:45:37","date_gmt":"2022-02-03T07:15:37","guid":{"rendered":"https:\/\/cbsepython.in\/?p=2597"},"modified":"2026-01-05T13:50:14","modified_gmt":"2026-01-05T08:20:14","slug":"introduction-to-python-module-class-11-computer-science","status":"publish","type":"post","link":"https:\/\/cbsepython.in\/introduction-to-python-module-class-11-computer-science\/","title":{"rendered":"Introduction to Python Module Class 11 Notes Computer Science"},"content":{"rendered":"

Introduction to Python Module Class 11 Computer Science<\/span><\/h1>\n

Python modules<\/strong> are a key concept in the Class 11 Computer Science (CBSE)<\/strong> syllabus and are commonly asked in board exams and practical assessments. A Python module is a program file that contains functions, variables, or classes which can be reused in other programs using the import<\/code> statement. Learning modules helps students write organized, efficient, and reusable code<\/strong>, making it easier to manage large Python programs as per NCERT guidelines<\/strong>.<\/p>\n

What is module in Python?<\/span><\/h3>\n

Modules are\u00a0simply files with the \u201c.<\/b>\u00a0py\u201d extension containing Python code<\/b> that can be imported inside another Python Program. A\u00a0module<\/em> can contain executable statements as well as function definitions. A module allows you to logically organise your python code. <\/span><\/p>\n

 <\/p>\n

User-Defined Modules in Python<\/span><\/h3>\n

You can create your own functions and classes, put them inside modules and voila! You can now include hundreds of lines of code into any program just by writing a simple import statement. To create a module, just put the code inside a . py file.\u00a0<\/span><\/p>\n

 <\/p>\n

Creating a Module in Python:<\/span><\/h3>\n

In Python , the modules or User-Defined functions are created with def keyword. The general syntax is:<\/span><\/p>\n

 <\/p>\n

def module_name\/function_name():<\/span><\/strong><\/p>\n

python program statements<\/span><\/strong><\/p>\n

 <\/p><\/blockquote>\n

# Program to create a module in Python.<\/span><\/strong><\/p>\n

def sum():\r\n    a=int(input(\"Enter first number\"))\r\n    b=int(input(\"Enter second number\"))\r\n    result=a+b\r\n    print(\"sum of %d and %d is %d\"%(a,b,result))\r\n<\/pre>\n
Now I am saving the above python code as sum_module.py.<\/span><\/p>\n
 <\/p>\n
Importing Python Module in Same Program:<\/span><\/h3>\n
Now we will import the above created module.<\/span><\/p>\n
 <\/p>\n
>>> import sum_module\r\n>>> sum_module.sum()\r\nEnter first number45\r\nEnter second number34\r\nsum of 45 and 34 is 79\r\n>>><\/pre>\n
<\/h3>\n
\"\"<\/p>\n
 <\/p>\n
Importing Python Module in another Program<\/span><\/h3>\n
Let we create a simple calculator module\/function with three basic functions add, multiplication and division (+,* ,\/). We will save the python file as calculator.py<\/strong><\/em>.<\/span><\/p>\n
 <\/p>\n
# creating module\/function with three airthmetic operations (+,* and \/)\r\ndef sum(a,b):\r\n    result= a+b\r\n    return result\r\ndef mul(a,b):\r\n    result= a*b\r\n    return result\r\ndef div(a,b):\r\n    result= a\/b\r\n    return result\r\n<\/pre>\n
 <\/p>\n
Now we will create an another python program named mathclc.py , from where we access the functions of above program calculator.py.<\/span><\/p>\n
# importing calculator module\r\nimport calculator \r\na=int(input(\"Enter first number\"))\r\nb=int(input(\"Enter second number\"))\r\nprint (\"sum of entered numbers\",calculator.sum(a,b))\r\nprint (\"multiplication of entered numbers\",calculator.mul(a,b))\r\nprint (\"division of entered numbers\",calculator.div(a,b))\r\n<\/pre>\n
 <\/p>\n
Output:<\/strong><\/p>\n
 <\/p>\n
Enter first number10<\/span>\r\nEnter second number2<\/span>\r\n('sum of entered numbers', 12)<\/span>\r\n('multiplication of entered numbers', 20)<\/span>\r\n('division of entered numbers', 5)<\/span>\r\n>>><\/span><\/pre>\n
\"\"<\/p>\n
 <\/p>\n
The from import Statement<\/h2>\n
With this method we can import some specific function definitions from a module without importing the whole module.<\/p>\n
Syntax:<\/strong><\/p>\n
from module_name import function_name<\/strong><\/p><\/blockquote>\n
For better understanding we will implement this method in above created module calculator.py<\/strong>.<\/p>\n
>>> from calculator import sum\r\n>>> sum(10,12)\r\n22\r\n>>><\/pre>\n
 <\/p>\n
\"\"<\/p>\n
<\/h3>\n
The from module import * Statement<\/span><\/h3>\n
In this method we import all the functions from a module into the current program. In this method (*) means to import all objects into the calling program.\u00a0<\/span><\/p>\n
Syntax:<\/strong><\/span><\/p>\n
from module_name import *<\/strong><\/span><\/p><\/blockquote>\n
In previous programs we created calculator.py <\/strong>module. <\/strong>Now we will create another module area.py<\/strong> to calculate area of rectangle and will import these two modules in another program named test.py<\/strong>.<\/span><\/p>\n
# Python function\/ module to calculate area of rectangle area.py<\/span><\/strong><\/p>\n
# module\/function to calculate area of rectangle\r\ndef react_area(l,w):\r\n    result=(l*w)\r\n    return result\r\n    \r\n<\/pre>\n
 <\/p>\n
# Python module test.py<\/strong> in which we import above modules calculator.py <\/strong>andarea.py.<\/strong><\/span><\/p>\n
from calculator import *\r\nfrom area import *\r\nprint(\"area of rectangle\",react_area(5,3))\r\nprint(\"sum of entered numbers is\",sum(5,3))\r\n<\/pre>\n
 <\/p>\n
Output:<\/span>\r\n\r\n('area of rectangle', 15)<\/span>\r\n('sum of entered numbers is', 8)<\/span>\r\n>>><\/span><\/pre>\n
 <\/p>\n
 <\/p>\n
Built in Modules\/ Standard Library in Python<\/span><\/h3>\n
A library is just a module that contains some useful definitions. Python has a large variety of standard library modules.\u00a0 \u00a0<\/span><\/p>\n
Some of them are math module, random module, datetime module and statistics module etc.\u00a0<\/span><\/p>\n
In this section we will only cover math module.\u00a0<\/span><\/strong><\/p>\n
 <\/p>\n
math Module:<\/span><\/h2>\n
Python has a math module that provides most of the mathematical and trigonometric functions. To use math module you just have to put a line import math at the top of your python code.\u00a0<\/span><\/p>\n
How to use:\u00a0<\/span><\/p>\n
Syntax:<\/span><\/p>\n
import math<\/span><\/p>\n
print math.function_name(variable)<\/span><\/p>\n
 <\/p>\n
math module has the following functions.\u00a0\u00a0<\/span><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Function<\/span><\/td>\nDescription\u00a0<\/span><\/td>\n<\/tr>\n
pi<\/span><\/td>\nMathematical constant, the ratio of circumference of a circle to it’s diameter (3.14159…)<\/span><\/td>\n<\/tr>\n
e<\/span><\/td>\nmathematical constant e (2.71828…)<\/span><\/td>\n<\/tr>\n
sqrt(x)<\/span><\/td>\nReturns the square root of x<\/span><\/td>\n<\/tr>\n
ceil(x)<\/span><\/td>\nReturns the smallest integer greater than or equal to x<\/span><\/td>\n<\/tr>\n
floor(x)<\/span><\/td>\nReturns the largest integer less than or equal to x<\/span><\/td>\n<\/tr>\n
pow(x,y)<\/span><\/td>\nReturns x raised to the power y<\/span><\/td>\n<\/tr>\n
fabs(x)<\/span><\/td>\nReturns the absolute value of x<\/span><\/td>\n<\/tr>\n
sin(x)<\/span><\/td>\nReturns the sine of x<\/span><\/td>\n<\/tr>\n
cos(x)<\/span><\/td>\nReturns the cosine of x<\/span><\/td>\n<\/tr>\n
tan(x)<\/span><\/td>\nReturns the tangent of x<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
 <\/p>\n
Implementation of math module<\/span><\/h2>\n
 <\/p>\n
import math\r\nprint(math.pi)\r\nprint(math.e)\r\nprint(math.sqrt(25))\r\nprint(math.ceil(5))\r\nprint(math.floor(8))\r\nprint(math.pow(4,3))\r\nprint(math.fabs(3))\r\nprint(math.sin(30))\r\nprint(math.cos(60))\r\nprint(math.tan(45))\r\n<\/pre>\n
 <\/p>\n
Output:<\/strong><\/p>\n
3.14159265359<\/span>\r\n2.71828182846<\/span>\r\n5.0<\/span>\r\n5.0<\/span>\r\n8.0<\/span>\r\n64.0<\/span>\r\n3.0<\/span>\r\n-0.988031624093<\/span>\r\n-0.952412980415<\/span>\r\n1.61977519054<\/span>\r\n>>><\/span><\/pre>\n
Screenshots:<\/span><\/p>\n
\"\"<\/p>\n
 <\/p>\n
\"\"<\/p>\n
 <\/p>\n
Check Here: Random Function in Python Class 11 Notes<\/a><\/span><\/h2>\n","protected":false},"excerpt":{"rendered":"
Introduction to Python Module Class 11 Computer Science Python modules are a key concept in the Class 11 Computer Science (CBSE) syllabus and are commonly asked in board exams and practical assessments. A Python module is a program file that contains functions, variables, or classes which can be reused in other programs using the import […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15,20],"tags":[],"class_list":["post-2597","post","type-post","status-publish","format-standard","hentry","category-cbse-sample-papers-class-11","category-cbse-computer-science-with-python-class-12"],"_links":{"self":[{"href":"https:\/\/cbsepython.in\/wp-json\/wp\/v2\/posts\/2597","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cbsepython.in\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cbsepython.in\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cbsepython.in\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/cbsepython.in\/wp-json\/wp\/v2\/comments?post=2597"}],"version-history":[{"count":2,"href":"https:\/\/cbsepython.in\/wp-json\/wp\/v2\/posts\/2597\/revisions"}],"predecessor-version":[{"id":5575,"href":"https:\/\/cbsepython.in\/wp-json\/wp\/v2\/posts\/2597\/revisions\/5575"}],"wp:attachment":[{"href":"https:\/\/cbsepython.in\/wp-json\/wp\/v2\/media?parent=2597"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cbsepython.in\/wp-json\/wp\/v2\/categories?post=2597"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cbsepython.in\/wp-json\/wp\/v2\/tags?post=2597"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}