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 CHAPTER 10:Strings Manipulation

Introduction

l Immutable

l A strings are enclosed with ‘ ’,” ”,’’’  ‘’’

l A string Object always represents the same string.‘123’,

l Python strings are stored in memory by storing individual character in contiguous memory

l This sequences of UNICODE character may include a letter,a number,special character,white-space or a backslash

l 

For example:

“Hello Python”

‘Hello Python’

‘’’ Hi Hello Python1234’’’

Creating a string:

A=”Good Morning”

>>>X=”Write article on \”AI\” briefly”

‘Write article on ”AI” briefly’

Empty String

>>>str=”  ”

>>>str

‘ ’

>>>str=’ ’

>>>str

‘ ’

 Multi-line  String:

>>>A=’’’ This is a \

Multi-line String \

Example’’’

>>>A

This is a Multi-line String Example

 Traversing String

Accessing all the elements of the string one after the other by using the subscript or index value.

For example:

S=”HELLO PYTHON”

Positive Index (Forward Index)	0	1	2	3	4	5	6	7	8	9	10	11
(String Variable) S=	H	E	L	L	O		P	Y	T	H	O	N
Negative Index(Backward index)	-12	-11	-10	-9	-8	-7	-6	-5	-4	-3	-2	-1

  

>>>S="HELLO PYTHON"

>>>S[0]

'H'

>>>S[3]

'L'

>>>S[-1]

'N'

>>>S[-4]

'T'