- Python Tutorial
- Python variables and types
- Python Arithmetic Operators
- Python Lists – basics: define, access, assign, delete, print, concatenate
- Python Lists – Negative Indexing, Slicing, Stepping, Comparing, Max and Min
- Comparison Operators
- Assignment Operator
- Python membership and identity operators
- Python strings
- Python escape characters
- Python string special operators
- Built-in string operations in Python
- Built-in string operations in Python -II
- String Formatting Operators
- Special string operators
- Conditions in Python
- Loops in Python
- Functions in Python
- Python Classes, Objects and OOP concepts
- Class inheritance
- Generators
- Regular Expressions in Python
- Regular Expressions in Python – II
- Comprehension Lists in Python
- Python functions with multiple arguments
- Exception Handling in Python
- Sets in Python
Python string special operators
Concatenation operator ‘+’
‘+’ operator is used for concatenation. Concatenation means combining, when + operator is used with string the string on right side of the operator is added to the string on the left side of the operator.
Look at the example given below, var1 has the value of ‘Welcome’, var2 has the value of ‘John’. var3 = var1 + var2 = ‘Welcome’ + ‘John’ = ‘Welcome John’
var1 = 'Welcome '
var2 = 'John'
var3 = var1 + var2
print ("'welcome ' + 'John' = " + var3)
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Repetition of string using * operator
‘*’ is used to repeat multiple copies of same string. If you look at the code given below, var1 has the value = ‘Welcome’ and var2 = var1*6 = var1 + var1 + var1 + var1 + var1 + var1.
var1 = 'Welcome '
var2 = var1*6
print ("'welcome ' * 6 = " + var2)
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Retrieving character from a given index of string
If you want to know which is the character at a particular location in string then that can be done easily. The first character in the string is at position 0, the second character is at position 1, the third character is at index 2 and so on.
In the following piece of code, var1 has the value of ‘Welcome’. Here we try to find out which character is present at second position which means index 1.
var1 = 'Welcome '
print ("The second character in string 'welcome ' is " + var1[1])
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Range of slice
Range of slice is used when you want to retrieve a certain section of the string. In the code shown below we try to retrieve four characters from the string var1 starting from second position i.e. index 1.
var1 = 'Welcome '
print ("The second to fourth characters in string 'welcome ' are " + var1[1:5])
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String operator ‘in’
String operator ‘in’ returns a Boolean value of either true or false. If the pattern of characters that you are searching for exists in the string then it will return the value of ‘true’ or else it will return ‘false’
var1 = 'Welcome'
if 'e' in var1: print ("'e' exists in the word 'welcome'")
else: print ("'e' does not exist in the word 'welcome'")
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String operator ‘not in’
String operator ‘not in’ returns a Boolean value of either true or false. If the pattern of characters that you are searching for does not exist in the string then it will return the value of ‘true’ or else it will return ‘false’.
var1 = 'Welcome'
if 'e' not in var1: print ("'e' does not exist in the word 'welcome'")
else: print ("'e' exists in the word 'welcome'")