Python- Strings

Welcome boys

Lets start the topic for the day.- "Strings in Python"
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By the end of the session, you will be able to 

• Understand the string data type
• definition and purpose of string data type
• Ways to access strings and their subsets
• Apply the concatenation operator and predict the output.

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Please connect to me via Google meet. Click on the following link:

Meeting ID

meet.google.com/dpj-torb-fsn

Python Strings

• Strings in Python are identified as a contiguous set of characters represented in the quotation marks. 
• Python allows for either pairs of single or double quotes. 
• Subsets of strings can be taken using the slice operator ([ ] and [:] ) with indexes starting at 0 in the beginning of the string and working their way from -1 at the end.
• The plus (+) sign is the string concatenation operator.
•  The asterisk (*) is the repetition operator. For example −

(To check the output,Click on "Live Demo" )

Live Demo

#!/usr/bin/python

str = 'Hello World!'

print str          # Prints complete string
print str[0]       # Prints first character of the string
print str[2:5]     # Prints characters starting from 3rd to 5th
print str[2:]      # Prints string starting from 3rd character
print str * 2      # Prints string two times
print str + "TEST" # Prints concatenated string

This will produce the following result −

Hello World!
H
llo
llo World!
Hello World!Hello World!
Hello World!TEST

EXERCISE

What can you say about the string data type?
Is there a difference between "Geeta" and 'Geeta'? Justify.
Predict the output of the following:

print("SCS"*5)
print(("SCS"," ")*5)
print("I"+"Love"+"Columbas")
print("I","Love","Columbas")
print("I\n"+"Love\n"+"Columbas\n")
print("I\t"+"Love\t"+"Columbas\t")

Suppose 

           str='I LOVE COLUMBAS'

Predict the output of the following:

print str          # Prints complete string
print str[0]       # Prints first character of the string
print str[2:5]     # Prints characters starting from 3rd to 5th
print str[2:14]    # Prints string starting from 3rd character
print str * 2      # Prints string two times
print str[0:5] + " MUSIC"