Operators

List supports following operators;

• Mathematical operators
• Comparison operators
• Membership operators

Mathematical operators

• We can use + and * operators for List objects.

Concatenation operator(+)

• We can use + to concatenate 2 lists into a single list.

Example

a=[10,20,30]
b=[40,50,60]
c=a+b
print(c)

Output

[10,20,30,40,50,60]

Note

• To use + operator compulsory both arguments should be list objects, otherwise we will get TypeError.

Example

a=[10,20,30]
b=a+40
print(b)

Output

TypeError: can only concatenate list (not "int") to list

Repetition Operator(*)

• We can use repetition operator * to repeat elements of list specified number of times.

Example

x=[10,20,30]
y=x*3
print(y)

Output

[10,20,30,10,20,30,10,20,30]

Comparison Operators

• We can use comparison operators for List objects.

Example

x=["Dog","Cat","Rat"]
y=["Dog","Cat","Rat"]
z=["DOG","CAT","RAT"]
print(x==y)
print(x==z)
print(x != z)

Output

True
False
True

Note

• Whenever we are using comparison operators(==, !=) for List objects then the following should be considered.
  • The number of elements.
  • The order of elements.
  • The content of elements (case sensitive).

Note

• When ever we are using relatational operators (<, <=, >, >=) between List objects, only first element comparison will be performed.

Example

x=[50,20,30]
y=[40,50,60,100,200]
print(x>y)
print(x>=y)
print(x<y)
print(x<=y)

Output

True
True
False
False

Example

x=["Dog","Cat","Rat"]
y=["Rat","Cat","Dog"]
print(x>y)
print(x>=y)
print(x<y)
print(x<=y)

Output

False
False
True
True

Membership operators

• We can check whether element is a member of the list or not by using membership operators.
  • in operator
  • not in operator

Example

n=[10,20,30,40]
print(10 in n)
print(10 not in n)
print(50 in n)
print(50 not in n)

Output

True 
False 
False 
True

Ungraded Questions

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