Python Devlopment



  Dictionaries   for loop   Functions   if...else   input() function   Introduction   Lists   Multiple return types   Operators   Range() Function   Sample Menu driven Program   Sets   Strings   Tuple   Variables   While Loop
  Built-in Functions   Recursive Function   User-Defined Function
  Basics of Strings   Escape Characters   String Operations   String Slicing
  Built-in Methods   Built-in Operators   Comprehensions   List Slicing   Lists   Creating Index
  Basic Tuple Operations   Built-in Tuple Functions   Tuple Introduction
  Built-in Dictionary Methods   Introduction to Dictionaries   Operations in Dictionary   Properties of Dictonary
  Overview of OOP's
  Directories   Exceptions   Text Files
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  Practice Programs-1   Practice Programs-2   Calendar   Command line-1   Command Line-2   Simple Calculator   vowels   Booted Legacy   OS Version


Strings

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2.2 Python Strings:

In python, string can be represented using either single quote or double quote like “Hello” is same as “‘Hello’ and strings can be printed using print statement.

Example 1:

>>>print(“Hello World!”)
Hello World!
>>>print(‘Hello World!’)
Hello World!

Example 2:

Get the character at position 1 (remember that the first character has the position 0):

a = "Hello, World!"
print(a[1])

Output: 
e

Example 3:

Substring. Get the characters from position 2 to position 5 (not included):

b = "Hello, World!"
print(b[2:5])

Example 4:

The len() method returns the length of a string:

a = "Hello, World!"
print(len(a))

Output:
13

Example 5:

The lower() method returns the string in lower case:

a = "Hello, World!"
print(a.lower())

Output: 
hello, world!

Example 6:

The upper() method returns the string in upper case:

a = "Hello, World!"
print(a.upper())

Output: 
HELLO, WORLD!

Example 7:

The replace() method replaces a string with another string:

a = "Hello, World!"
print(a.replace("H", "J"))

Output: 
Jello, World!
Exercise:

Write a function that accepts a text and a character as argument and returns the no. of occurrences of the character in the text. 

def count(text, ch):  #Definition
    n = 0 
    for i in text: 
        if ch == i: 
            n += 1 
    return n 

#calling statement
n=count(text,ch)      #Return type function