Special Operators

Python defines the following 2 special operators

• Identity Operators
• Membership operators

Identity Operators

• We can use identity operators for address comparison.
• There are 2 identity operators are available
  • is
  • is not

Remark

• r1 is r2 ⇒ returns True if both r1 and r2 are pointing to the same object.
• r1 is not r2 ⇒ returns True if both r1 and r2 are not pointing to the same object.

Example

num1 = 10
num2 = 10
print(num1 is num2)

bool1 = True
bool2 = True
print(bool1 is bool2)

Output

True
True

Example

str1 = "ajay"
str2 = "ajay"
print(id(str1))
print(id(str2))
print(str1 is str2)

Output

139689637218672
139689637218672
True

Example

list1 = ["one", "two", "three"]
list2 = ["one", "two", "three"]
print(id(list1))
print(id(list2))
print(list1 is list2)
print(list1 is not list2)
print(list1 == list2)

Output

140194451674432
140194451690752
False
True
True

Remark

• We can use is operator for address comparison where as == operator for content comparison.

Membership operators

• We can use Membership operators to check whether the given object present in the given collection (String, List, Set, Tuple or Dict).
• There are 2 identity operators are available
  • In ⇒ Returns True if the given object present in the specified Collection.
  • not in ⇒ Returns True if the given object not present in the specified Collection.

Example

str1 = "hello learning Python is very easy!!!"
print('l' in str1)
print('d' in str1)
print('d' not in str1)
print('Python' in str1)

Output

True
False
True
True

Example

list1 = ["kuldeep", "ajay", "amit"]
print("ajay" in list1)
print("manish" in list1)
print("manish" not in list1)

Output

True
False
True

Ungraded Questions

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