Strings & its Operations

Strings Overview

Stings are closed collection of Unicode Characters. These string can be enclosed in single, double, or triple quotes.

Example: ‘dclessons’, “dclessons”, ‘’’dclessons’’’, “””dclessons”””

If you have character like ‘ “or \ with in string they can be retained either in two ways.

Escape it by preceding them with a \
Prepend the string with ‘r’, showing them this is raw string.

X = ‘Dclessons is, \ ‘very good online portal.\’’

X = r‘Dclessons is ,\ ‘very good online portal.’’

Multistring can be created in three ways.

Write the string but put \ at end of each line
Enclosed with in “””” XXXXXX””” or ‘’’ XXXXX’’’
(‘first msg’ ‘Second string’)

Example 1: Let’s understand how to create Simple and Multi-Line Strings.

String1 = 'Dclessons' print(String1) String2 = 'Dclessons is \'top online webportal' print(String2) String3 = 'Dclessons is top online training ...\ webportal in DataCenter technology' print(String3) String4 = """Dclessons is top online training webportal in DataCenter Technology""" Print(String4) ============================== Result Dclessons Dclessons is 'top online webportal Dclessons is top online training ... webportal in DataCenter technology Dclessons is top online training webportal in DataCenter Technology

Example 2: How to do String Replication.

String1 = 'Dclessons' print(String1*5) String2 = 'dclessons is' String3 = 'Good Online Portal' String4 = String2+String3 print(String4) print(len(String4)) ========================= Result DclessonsDclessonsDclessonsDclessonsDclessons dclessons isGood Online Portal 30

String Numbering

Strings can be accessed via index Value. It starts with 0 Index Value. Negative Index Value is also allowed. Let’s see below example how String are indexed.

0	1	2	3	4	5	6	7	8
D	C	L	E	S	S	O	N	S
-9	-8	-7	-6	-5	-4	-3	-2	-1

Example

X = DCLESSONS

Y = X[2] = L
Y=X[4] = s
Y = X[-6] = E

Now if you want to slice out some sub-string from main strings , it can be done by using following string functions.

X[start : End] : It extract from start to End -1
X[Start:]: it Extract from start to End
X[:End] : It extract from start to End -1
X[-Start :] : It extract from –Start ( including ) to End

Example 3: Lets for String X = Dclessons, write a Program to get following output.

Dc
Dc
lesson
lessons
snosselcD

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Strings & its Operations