String Manipulation - Python

Why String Manipulation

All programming languages allow you to manipulate strings, it is an essential skill and function. You could use it to find a value within a string, use it to select only a part of the string and so on.

String Manipulation in Python

Print a String

str = 'Hello World!' 
print (str) # Prints complete string

Get the length of a String

str = 'Hello World!' 
print ( len(str) ) # len() gets the length of a string

Get a Character from a String

str = 'Hello World!' 
print (str[0]) # Prints first character of the string, or any character at the element provided so str[3] will get the 4th character

Get a Selection of the String from the Middle

str = 'Hello World!' 
print (str[2:5]) # Prints characters starting from 3rd to 5th, this allows you to select a part of a string

Get a Selection of the String from the Start or End

str = 'Hello World!' 
print (str[2:]) # Prints string starting from 3rd character until the end
print (str[:2]) # Prints string starting from the start and upto the 3rd character

Repeating String

str = 'Hello World!' 
print (str * 2) # Prints string two times

String Concatenation

str = 'Hello World!' 
print (str + "TEST") # Prints concatenated string

Now Try

Create a program to count the number of vowels in a given sentence or string

• Ask the user to enter a sentence or string
• Create a for loop to cycle through each character (hint test[0] will access the first element of a string called test)
• Create the if statements to count number of A, E, I, O, & U's
• Display a message to say how many of each vowel is present