Induction variable in Python's for loop

for i in range(4):
    print(i) # 0 1 2 3

print(i) # 3

for i in range(6):
    if i % 2 == 0:
        i += 2
    print(i) # 2 1 4 3 6 5 5

Conclusion:

• induction variable的scope不仅限于for loop
• 不管for loop内部对induction variable如何修改，for loop本身还会对其重新赋值