Why can't “i” be manipulated inside for-loop [duplicate]

Answer 1

i is assigned at each loop iteration overwriting any changes done to its value.

for i in range(10):
    i += 1
    print(i)

is equivalent to:

 i = 0 # first iiteration
 i += 1
 print(i)

 i = 1 # second iiteration
 i += 1
 print(i)

 i = 2 # third iiteration
 i += 1
 print(i)

 # etc up to i = 9