I tried converting the tuples in a list of tuples using range and code worked but when i tried the same using 'for i in list:' it is not working:

lst = [(8, 7), (9, 6), (4, 8), (3, 5), (9, 4)]

for i in range(len(lst)):
    lst[i] = list(lst[i])

this is working fine.

for i in lst:
    i = list(i)

but this is not working. I don’t know why ? Can anyone please tell me the reason ?

>Solution :

In your first code

for i in range(len(lst)):
    lst[i] = list(lst[i])

lst[i] is a variable which directly point to the element in list. Hence, any change in it effects the list itself.

Whereas in your second code

for i in lst:
    i = list(i)

i is a variable used in for loop and is not pointing to the list lst. Hence, any change to id doesn’t affect the lst.