Replace one character in the Python string

String is an immutable type and cannot be modified,
As if you can't change the value of the tuple.
So if you want to change the string, you need to use replace or list.

Use list
When you want to change the position you want.

a = 'asd'
a = list(a)  # ['a', 's', 'd']
a[0] = 'kk'  # ['kk', 's', 'd']
print(''.join(a))  # 'kksd'

replaceutilization
When you want to change the string of a particular pattern

a = 'asda'
a.replace('a', '12')  # '12sd12'

If you change the contents of Gauguin's inquiry as above, it is as follows.

a = 'A'
g = 10
a = list(a)
a[0] = str(g)  # ['10']
print(''.join(a))  # '10'