Mutable vs immutable

Mutable and immutable are English words meaning “can change” and “cannot change” respectively. The meaning of the words is the same in the IT context; i.e.

  • a mutable string can be changed, and
  • an immutable string cannot be changed

Python code:

String are immutable, if we run following code it throw an error

varstr=’string is immuttable’

varstr[1]=’h’
print(varstr[1])

Output:

TypeError: ‘str’ object does not support item assignment

Tuple are also immutable:

vartup=1,2,3,4,5

vartup[1]=’this is immutable’

print(vartup)

List are mutable:

vardict={1:’India’,2:’US’,3:’UK’}

vardict[1]=’Canada’

print(vardict[1])

Dictionary are mutable:

vardict={1:’India’,2:’US’,3:’UK’}

vardict[1]=’Canada’

print(vardict[1])

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