Operator Functions in Python | Set 1
More functions are discussed in this article.
1. setitem(ob, pos, val) :- This function is used to assign the value at a particular position in the container.
Operation – ob[pos] = val
2. delitem(ob, pos) :- This function is used to delete the value at a particular position in the container.
Operation – del ob[pos]
3. getitem(ob, pos) :- This function is used to access the value at a particular position in the container.
Operation – ob[pos]
# Python code to demonstrate working of # setitem(), delitem() and getitem() # importing operator module import operator
# Initializing list li = [ 1 , 5 , 6 , 7 , 8 ]
# printing original list print ( "The original list is : " ,end = "")
for i in range ( 0 , len (li)):
print (li[i],end = " " )
print ( "\r" )
# using setitem() to assign 3 at 4th position operator.setitem(li, 3 , 3 )
# printing modified list after setitem() print ( "The modified list after setitem() is : " ,end = "")
for i in range ( 0 , len (li)):
print (li[i],end = " " )
print ( "\r" )
# using delitem() to delete value at 2nd index operator.delitem(li, 1 )
# printing modified list after delitem() print ( "The modified list after delitem() is : " ,end = "")
for i in range ( 0 , len (li)):
print (li[i],end = " " )
print ( "\r" )
# using getitem() to access 4th element print ( "The 4th element of list is : " ,end = "")
print (operator.getitem(li, 3 ))
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Output:
The original list is : 1 5 6 7 8 The modified list after setitem() is : 1 5 6 3 8 The modified list after delitem() is : 1 6 3 8 The 4th element of list is : 8
4. setitem(ob, slice(a,b), vals) :- This function is used to set the values in a particular range in the container.
Operation – obj[a:b] = vals
5. delitem(ob, slice(a,b)) :- This function is used to delete the values from a particular range in the container.
Operation – del obj[a:b]
6. getitem(ob, slice(a,b)) :- This function is used to access the values in a particular range in the container.
Operation – obj[a:b]
# Python code to demonstrate working of # setitem(), delitem() and getitem() # importing operator module import operator
# Initializing list li = [ 1 , 5 , 6 , 7 , 8 ]
# printing original list print ( "The original list is : " ,end = "")
for i in range ( 0 , len (li)):
print (li[i],end = " " )
print ( "\r" )
# using setitem() to assign 2,3,4 at 2nd,3rd and 4th index operator.setitem(li, slice ( 1 , 4 ),[ 2 , 3 , 4 ])
# printing modified list after setitem() print ( "The modified list after setitem() is : " ,end = "")
for i in range ( 0 , len (li)):
print (li[i],end = " " )
print ( "\r" )
# using delitem() to delete value at 3rd and 4th index operator.delitem(li, slice ( 2 , 4 ))
# printing modified list after delitem() print ( "The modified list after delitem() is : " ,end = "")
for i in range ( 0 , len (li)):
print (li[i],end = " " )
print ( "\r" )
# using getitem() to access 1st and 2nd element print ( "The 1st and 2nd element of list is : " ,end = "")
print (operator.getitem(li, slice ( 0 , 2 )))
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Output:
The original list is : 1 5 6 7 8 The modified list after setitem() is : 1 2 3 4 8 The modified list after delitem() is : 1 2 8 The 1st and 2nd element of list is : [1, 2]
7. concat(obj1,obj2) :- This function is used to concatenate two containers.
Operation – obj1 + obj2
8. contains(obj1,obj2) :- This function is used to check if obj2 in present in obj1.
Operation – obj2 in obj1
# Python code to demonstrate working of # concat() and contains() # importing operator module import operator
# Initializing string 1 s1 = "geeksfor"
# Initializing string 2 s2 = "geeks"
# using concat() to concatenate two strings print ( "The concatenated string is : " ,end = "")
print (operator.concat(s1,s2))
# using contains() to check if s1 contains s2 if (operator.contains(s1,s2)):
print ( "geeksfor contains geeks" )
else : print ( "geeksfor does not contain geeks" )
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Output:
The concatenated string is : geeksforgeeks geeksfor contains geeks
9. and_(a,b) :- This function is used to compute bitwise and of the mentioned arguments.
Operation – a & b
10. or_(a,b) :- This function is used to compute bitwise or of the mentioned arguments.
Operation – a | b
11. xor(a,b) :- This function is used to compute bitwise xor of the mentioned arguments.
Operation – a ^ b
12. invert(a) :- This function is used to compute bitwise inversion of the mentioned argument.
Operation – ~ a
# Python code to demonstrate working of # and_(), or_(), xor(), invert() # importing operator module import operator
# Initializing a and b a = 1
b = 0
# using and_() to display bitwise and operation print ( "The bitwise and of a and b is : " ,end = "")
print (operator.and_(a,b))
# using or_() to display bitwise or operation print ( "The bitwise or of a and b is : " ,end = "")
print (operator.or_(a,b))
# using xor() to display bitwise exclusive or operation print ( "The bitwise xor of a and b is : " ,end = "")
print (operator.xor(a,b))
# using invert() to invert value of a operator.invert(a) # printing modified value print ( "The inverted value of a is : " ,end = "")
print (operator.invert(a))
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Output:
The bitwise and of a and b is : 0 The bitwise or of a and b is : 1 The bitwise xor of a and b is : 1 The inverted value of a is : -2