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learnpython24-(Python Program to Find Factorial of Number Using Recursion)

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  Python Program to Find Factorial of Number Using Recursion In this program, you'll learn to find the factorial of a number using recursive function. To understand this example, you should have the knowledge of the following  Python programming  topics: Python if...else Statement Python Functions Python Recursion The factorial of a number is the product of all the integers from 1 to that number. For example, the factorial of 6 is  1*2*3*4*5*6 = 720 . Factorial is not defined for negative numbers and the factorial of zero is one, 0! = 1. Source Code # Factorial of a number using recursion def recur_factorial (n) : if n == 1 : return n else : return n*recur_factorial(n -1 ) num = 7 # check if the number is negative if num < 0 : print ( "Sorry, factorial does not exist for negative numbers" ) elif num == 0 : print ( "The factorial of 0 is 1" ) else : print ( "The factorial of" , num, "is" , recur_fac...
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learnpython24-(Using Modules & Pip In Python)

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  Using Modules & Pip In Python Sometimes we have to use someone else's code in our program because it saves us a lot of time. Today, we will learn a technique to use code that is not written by us but will enhance the quality of our program, save us time, and of course, it is legal and free. Let us understand what utilities like modules and pip are, Module  – Module or library is a file that contains definitions of several functions, classes, variables, etc . which is written by someone else for us to use. Pip  – Pip is a package manager for Python i.e., pip command can be used to download any external module in Pytho n . It is something that helps us to get code written by someone else from somewhere. We can install a module in our system by using pip command : Open cmd or Powershell in your system. And then, type pip install module_name and press enter. Once you do that, the module will start downloading and will install automatically on your computer. Example, f...
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learnpython24-(Dictionary & Its Functions Explained)

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  Dictionary & Its Functions Explained Before going through the actual content i.e. the implementation of a dictionary, it is important to know some basic theory, just so we know what we are going to learn and why are we spending our precious time learning it. Let's start with the basic definition of a Python Dictionary: “Python dictionary is an unordered collection of items. Each item of the dictionary has a key/value pair.” Now coming to the more formal approach: Every programming language has its own distinct features, commonly known as its key features. That said, Python’s one out of the box feature is “dictionaries”. Dictionaries may look very similar to a “List”, but dictionaries have some distinct features that do not hold true for other data types like lists, and those features are what makes it (python dictionary) special. Here are a few important features of a python dictionary: It is unordered (no sequence is required - data or entries have no order) It is mutable (v...
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