Python Tutorial

Introduction Python Features Python Applications System requirements for Python Python Installation Python Basics 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 Anonymous/Lambda Function in Python

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 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 Calendar Module  

Python MySQL

Python MySQL Python MySQL Update Operation Python MySQL Delete Operation

Python MongoDB

Python MongoDB

Python Data Structure Implementation

Python Stack Python Queue Python Hash Table Python Graph

Python Advance Topics

Speech Recognition in Python Face Recognition in Python Python Rest API Python Command Line Arguments Python JSON Python Virtual Environment Type Casting in Python Collections in python Python Enumerate Python Debugger Python DefaultDict

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 List Comprehension in Python3 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 Python Ternary Operators Self in Python Python vs Java Python Modulo Python Packages Python Syntax Python Uses Python Logical Operators Python Multiprocessing Python History 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 Design patterns in python 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 Abstract design pattern in python Builder design pattern in python Prototype design pattern in Python Creational design patterns in Python

How to

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

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 Singleton design pattern in python

Python for loop

 Python for loop

A for loop in Python executes a block of code for a specified number of times, based on a given sequence. The for loop in Python is different than any other programming language like C or Pascal. It is used to traverse the Python data structure like list, dictionary, or tuple.

Syntax

for iterating_var in sequence: 
   statements

If a sequence holds an expression list, it is evaluated first. Then, the first item in the sequence is allocated to the iterating variable iterating_var. Then, the statements block is executed. Each item in the list is assigned to iterating_var; the statement block is executed until the entire sequence is terminated.

Python For Loop

Flow- diagram

In the above flow diagram, for loop iterate over the sequence. It takes the first element of the sequence and executes the statement block. It moves on the next item in sequence until no item left in the sequence.

Examples of for loop

1. Write a program to print the square of two number from a given list

list = [1,2,3,4,5] 
for e in list:
    print(e**2)

Output:

1
4
9
16
25 

2. Write a program to Character from a given string

str = 'Python'
for e in str:
    print(e)

Output:

P
y
t
h
o
n 

3. Write a program to find the sum of all number of given list

list = [25,42,32,12,33]
 sum = 0
 for e in list:
    sum = sum+e
 print("The sum is:",sum)

Output:

The sum is: 144

Iterating by Sequence Index

We can iterate the sequence through the index of the element. First, let’s understand the range function.

The range () function:

The range () function is used to iterate over a given sequence of numbers. Generally, it takes three arguments (stop and step are optional). Python provides flexibility to define range function according to our requirement. For example:

  • range(n)- Generate the numbers starting from start to n-1 range(5) will generate 0,1,2,3,
  • range(start,stop)- Generate a set of numbers starting from start to stop-1 range(1,10) will generate 0,1,2,3,4,5,6,7,8,9
  • range(start,stop,step)- We can generate numbers having difference of the given step-size . range(3,20,3) will generate  3,6,9,12,15,18

Example of for loop using range()

Write a program to find sum of first 1 to n natural number

n=int(input('Enter the number'))
# Define a variable to stored number for specific range
sum=0
for i in range(1,n+1):
#As we know range(n) will generate n-1 that’s why we assign n+1
#it will generate n+1-1 or n numbers
    sum=sum+i
# Sum of numbers stored in sum variable
print(sum)

Output:

Enter the number 50
1275

Write a program to check the given number is prime or not.

n = 12
# If given number n is greater than 1
if n>1:
# Iterate from 2 to n // 2
    for i in range(2, n // 2):
# If n is divisible by any number between 2 and n // 2, it is not prime
        if (n % i) == 0:
            print(n,"is not a prime number")
            break
        else:
            print(n, "is a prime number")
else:
    print(n, "is not a prime number") 

Output:

23 is a prime number

Python Nested for loop

If a for loop exists inside another for loop, then it is called Nested for loop. Nested for loop is best to use in pattern programming. For example:

1. Write a program to print stars in a triangle shape.

n = int(input("Enter the number of lines"))
# Take input for number of lines
for i in range(n):
#first for loop is using for print number of lines
    for j in range(i):
#second for lop is using for print star(*)
        print("*",end='')
     print() 

           Output:

Enter the number of lines :10
 *
 **
 ***
 ****
 *****
 ******
 *******
 ********
 ********* 

2. Write a program to find the prime number within a range

 
start = int(input("Enter the start range"))
stop = int(input("Enter the stop range"))
for n in range(start,stop+1):
# If given number n is greater than 1
    if n>1:
 # Iterate from 2 to n // 2
        for i in range(2,n//2):
# If n is divisible by any number between 2 and n //2, it is not prime
            if(n%i==0):
                break
            else:
                print(n)
 else:
  print("the number is not greater than 1")

Output:

Enter the start range:100
Enter the stop range:150
101
103
107
109
113
127
131
137
139
149

Using else statement with for loop

Python provides the optional ‘else’ statement associated with for loop. The ‘else’ statement executes only when the loop has completed all iteration. For example:

for i in range(6):
    print(i)
 else:
    print("Iteration is completed")

Output:

0
1
2
3
4
5 
Iteration is completed 



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