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Why are Python Strings Immutable?

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  • Difficulty Level : Easy
  • Last Updated : 26 Dec, 2020

An unchanging article alludes to the item which is once made can’t change its worth all its lifetime.  Attempt to execute the accompanying code: 

Python3




name_1 = "Aarun" 
  
name_1[0] = 'T' 


You will get a mistake message when you need to change the substance of the string. 

Traceback (latest call last):  
Record "/home/ca508dc8fa5ad71190ca982b0e3493a8.py", line 2, in <module>  
name_1[0] = 'T'  
TypeError: 'str' object doesn't uphold thing task  

Arrangement  

One potential arrangement is to make another string object with vital alterations: 

Python3




name_1 = "Aarun"
  
name_2 = "T" + name_1[1:]
  
print("name_1 = ", name_1, "and name_2 = ", name_2)


Output:

name_1 =  Aarun and name_2 =  Tarun

To watch that they are various strings, check with the id() work: 

Python3




name_1 = "Aarun"
name_2 = "T" + name_1[1:]
  
print("id of name_1 = ", id(name_1))
print("id of name_2 = ", id(name_2))


Output:

id of name_1 =  2342565667256
id of name_2 =  2342565669888

To see more about the idea of string permanence, think about the accompanying code: 

Python3




name_1 = "Aarun"
name_2 = "Aarun"
  
print("id of name_1 = ", id(name_1))
print("id of name_2 = ", id(name_2))


At the point when the above lines of code are executed, you will find that the id’s of both name_1 and name_2 objects, which allude to the string “Aarun”, are the equivalent.  

To burrow further, execute the accompanying assertions: 

Python3




name_1 = "Aarun"
print("id of name_1 = ", id(name_1))
  
name_1 = "Tarun"
print("id of name_1  with new value = ", id(name_1))


Output:

id of name_1 =  2342565667256
id of name_1  with new value =  2342565668656

As can be found in the above model, when a string reference is reinitialized with another worth, it is making another article instead of overwriting the past worth.  

Note: In Python, strings are made changeless so software engineers can’t adjust the substance of the item. This keeps away from superfluous bugs.


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