for loop in Python

for loop is a definite loop and works with all types of values like integer, float, string, list in python.
Syntax:
for in :
Statements

Example: for loop with number values
Example 1:
# For Loop – Prints the number from 1 to 10
for num in range(1,11):
print(num)
range() function is used to specify the range of values for integer and float datatype.

Example 2:
# For Loop – Prints the number from 1 to 10 in reverse order
for num in reversed (range(1,11,2)):
print(num)

Example 3:
# For loop with String value
strN=”Win Corporate”

for ch in strN:
print (“Current Letter :” + ch)
#prints one character at a time from starting to the end of the string

Example: 4
# For loop with List
Company = [‘Win’, ‘Corporate’, ‘Training’]
for c in Company:
print (“Current value :” + c)
# prints one item at a time from the list.

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Python while loop

Python while Loop
while loop
It works as long as the given condition is true.
Syntax:
while ():
// Statements

Example 1:
# Printing the no.1 to 10
ctr=1 #initialization

print(“While Loop Demo”)
while (ctr<=10): #condition
print (ctr)
ctr = ctr +1 #incrementing part

Example 2:
#Printing the No.s from 1000 to 100

ctr=1000
print(“While Loop Demo”)
while (ctr >=100):
print (ctr)
ctr = ctr – 100
else:
print(“else part will execute when the condition becomes false”)

Note: Else is an optional and will execute when the condition given the while loop fails.

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Python if-elif-else Statement

if-elif-else statement
Multiple Conditions in the Program.
Ex:

# Example – if-elif-else statement

age = int(input(“Enter Your age: “))

if age =13 and age =19 and age =60 and age <=100:
print("Senior Citizen")

else:
print("Guess")

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Python if statement

Python – Conditional Statement

Def: Conditional Statement is used to give condition in the program.  Based on the  condition’s output only a part of the program will be executed.
Ex: if statement
Types:

  1. if
  2. if-else
  3. if-elif-else

if statement
condition is set using Comparison operator and when output is true it executes the statements given.
Ex:
# Example – if statement
age = int(input(“Please enter an integer: “))
if age >= 18:
print(“Can vote in Election”)

if-else statement
else part will executed when the condition is false.
Ex:
# Example – if else statement
age = int(input(“Please enter an integer: “))
if age >= 18:
print(“Can vote in Election”)
else:
print(“Can’t vote in Election”)

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Python String

String is a group of one or more characters enclosed in Single or Double Quote.
Example: –

  • “Win”
  • ‘Corporate’
  • “A”
  • “W001”

String Operation

Concatenation – Joining the Two Text or String values using “+” Symbol.
Ex: fname=”Sanjay” + ” K”

String Length – Finding the No. of characters in the String
Ex:len(“Win”) = 3

Indexing – Returns the character from the specific position from the String
Ex:
sname=”Sanjay”
sname[0]=”S”

Slicing – Returns group of Characters from the specified position.
Ex:
sname=”Sanjay”
sname[0:3]=”San”

Repeation – prints the string value specified no. of times.
Ex: n=”Sanjay” * 20 [Sanjay will be printed 20 times]

#String Operation in Python
sname=”Sanjay is good boy”

fname=”Sanjay” + ” K”
print(“Concatenation : ” + fname)

print(“Indexing :” + sname[0])

print(“Slicing”, sname[3:6])

print(‘Number of characters’)
print(len(sname))

n=”*” * 20
print(“Repeation : ” + n)

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Calculation in Python

We can perform all types of calculation and Comparison in Python.

Expression are used to perform calculations in Python.

Expression – Combination of  Numbers and Operator. Operator Decides the type of calculation performed by the Expression.
Example: 3+4=7

Types of Operator:

  1. Arithmetic Operator
  2. Comparison Operator
  3. Logical Operator

Arithmetic Operator – Performs the simple Mathematical Calculation.

# Accept nos from user and find its sum
x=int(input(‘Enter a number : ‘))
y=int(input(‘Enter a number1 : ‘))

#adding nos
sum=x+y

#print output
print(‘Sum is =’, sum)

Like Addition, Subtraction, Multiplication and Division can be performed.

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Python – First Program

Python First Program

#First program – Comment
print(“Hello World”)

Comment – #

  1. Provides the Description about the program
  2. Code will not be executed

print  Function

  1. Prints the output at the Console.
  2. printing statements can be given within the Single or Double Quote.

Steps to Create the Program:

  1. Open the Python IDLE [ Integrated Development Learning Environment]
  2.  Type the program at the Command Prompt.
winp1

Python IDLE

 

 

 

 

How to create a file File

  1. File -> New in Python IDLE
  2. Type the program in the file and Save the file with extnesion .py.
  3. Press F5 – Function key to run the program.

winp2

 

 

 

4. View output at the command prompt.

Next Part : Python Variable and Datatype

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