String In Python

 

Strings

• String is a collection of characters and can be defined as 

• in single quotes   '  '
• in double quotes  "  "
• in single-triple quotes  '''  '''
• in double-triple quotes   """   """

 #program

 name = 'Techno Xpresss'
 Website = "salahtutorials.com"
 description = '''SALAH : Sit And Learn At Home'''
 slogan= """Self Study is a Key 2 success"""

 print(name)
 print("type(name) : ", type(name))
 print(Website)
 print("type(name) : ", type(Website))
 print(description)
 print("type(name) : ", type(description))
 print(slogan)
 print("type(name) : ", type(slogan))


 #output

 Techno Xpresss
 type(name) :  <class 'str'>
 salahtutorials.com
 type(name) :  <class 'str'>
 SALAH : Sit And Learn At Home
 type(name) :  <class 'str'>
 Self Study is a Key 2 success
 type(name) :  <class 'str'>

                    double-triple quotes are generally used for documentation

• To access individual element of String, indexing is used.

 #program

 name = "Techno Xpresss"

 print("name[0] : ", name[0])
 print("name[5] : ", name[5])

 #output

 name[0] :  T
 name[5] :  o

• String allows positive and negative indexing.

 #program

 name = "Techno Xpresss"

 print("name[0] : ", name[0])
 print("name[5] : ", name[5])
 print("name[-1] : ", name[-1])
 print("name[-6] : ", name[-6])

 #output

 name[0] :  T
 name[5] :  o
 name[-1] :  s
 name[-6] :  p

• String can be defined as Empty

 #program

 name = ""

 print("name : ", name)
 print("type(name) : ", type(name))

 #output

 name :  
 type(name) :  <class 'str'>

• String with single element can also be defined

 #program

 name = "T"

 print("name : ", name)
 print("type(name) : ", type(name))

 #output

 name :  T
 type(name) :  <class 'str'>

            remember, a single/individual character will also be considered as a String in Python

• String allows Slice Operator

 #program

 name = 'Techno Xpresss'


 print("name[ : : ]  : ", name[ : : ])
 print("name[ : :-1] : ", name[ : :-1])
 print("name[ : :2]  : ", name[ : :2])
 print("name[2: :2]  : ", name[2: :2])

 #output

 name[ : : ]  :  Techno Xpresss
 name[ : :-1] :  ssserpX onhceT
 name[ : :2]  :  Tcn pes
 name[2: :2]  :  cn pes

• String allows multiplication and addition, while doing so, it will return new string.

 #program

 f_name = "Techno"
 l_name = "Xpresss"

 print("f_name : ", f_name)
 print("l_name : ", l_name)
 print("f_name + l_name : ", f_name + l_name)
 print("f_name + l_name : ", f_name + " " + l_name)
 print("f_name*3 + l_name : ", f_name * 3 + l_name)
 print("(f_name* + l_name )*3: ", (f_name + l_name + " ")*3)


 #output

 f_name :  Techno
 l_name :  Xpresss
 f_name + l_name :  TechnoXpresss
 f_name + l_name :  Techno Xpresss
 f_name*3 + l_name :  TechnoTechnoTechnoXpresss
 (f_name* + l_name )*3:  TechnoXpresss TechnoXpresss TechnoXpresss 

• Modify members value with assignment operator is not allowed

 #program

 name = "Techno Xpresss"
 print("name : ", name)
 name[6] = '-'
 print("name : ", name)


 #output

 name :  Techno Xpresss
 Traceback (most recent call last):
   File "C:/Self_Practice_Er_M_S_Dandyan/Python/Pycharm/xml/main.py", line 5, in <module>
     name[6] = '-'
 TypeError: 'str' object does not support item assignment