Inplace Operator in Python

python inplace, inplace in python, inplace python

Inplace operation is the operation which directly changes the content of an given linear algebra or vector or metrices without making a copy. Now the operators, which helps to do this kind of operation or task is called in-place operator.

Lets see this with an example

a = 4

a+= 3

print(a)

output :

Above the += tie input operator. Here first, a add 3 with that a value is updated the previous value.

Above principle applies to other operators also which is given below. Common in place operators are here-

Above principle applies to the other types apart from numbers, for example -

The Above operation is In Immutable targets, such as numbers, strings and tuples. Inplace operator behave same as the normal operators, i.e only assignment takes place, no modification is taken place in passed arguments.

Now lets see an other than number

language = "Python"
language +="4"
print(language)

output :

Python4

Above example of a+=b are equivalent to x = operator.iadd(a,b)

There are some multiple operators available which are used for inplace operations.

iadd()

This function is generally used to assign the current value and add them. This operator does a+=b operation.

import operator

x = 3

y = 5

a = 3

b = 5

l = operator.add(a,b) 

r = operator.iadd(x,y) 

# printing the modified value 

print (" adding by normal operator : ) 

print (l) 

# printing the modified value 

print (" adding by Inplace operator : ) 

print (r) 

# printing value of first argument 

# value is unchanged 

print ("argument using normal operator :) 

print (a) 

# printing value of first argument 

# value is unchanged 

print ("argument using Inplace operator : ) 

print (x)

Output:

adding by normal operator : 8
adding by Inplace operator : 8
argument using normal operator : 3
argument using Inplace operator : 3

Now we will discuss about the behaviour of Inplace operators in mutable targets, such as list and dictionaries, are they different from the normal operators.The updation and assignmentation both are carried out in case of mutable targets.

Lets see this by the piece of code as an example:

import operator 
  
a = [1, 2, 4, 5, 6] 
  
z = operator.add(a,[1, 2, 8]) 
  
print ("adding by normal operator : ) 
print (z) 

print (" argument by normal operator : ) 
print (a) 

p = operator.iadd(a,[1, 2, 8]) 
  
# printing the modified value 
print ("after adding by Inplace operator : ) 
print (p) 
  
# value is changed 
print ("argument by Inplace operator :) 
print (a) 

Output:

adding by normal operator : [1, 2, 4, 5, 6, 1, 2, 8]
argument by normal operator : [1, 2, 4, 5, 6]
after adding by Inplace operator : [1, 2, 4, 5, 6, 1, 2, 8]
argument by Inplace operator : [1, 2, 4, 5, 6, 1, 2, 8]

In this article i have briefly discussed about the comparison of Inplace and standard operators

Next Article : Python a += b is not always a = a + b

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