Python for循环中使用index索引

# 使用enumerate()实现
ints = [8, 23, 45, 12, 78]
for idx, val in enumerate(ints):
    print(idx, val)
ints = [8, 23, 45, 12, 78]
for index, item in enumerate(ints, start=0):   # 默认是从 0 开始
    print(index, item)
ints = [8, 23, 45, 12, 78]
for index, item in enumerate(ints, start=1):   # 索引修成从 1 开始
    print(index, item)

# 使用range()实现
ints = [8, 23, 45, 12, 78]
for i in range(len(ints)):
   print(i, ints[i])

# 仅使用for和in实现
ints = [8, 23, 45, 12, 78]
index = 0
for value in ints:
    index +=1
    print(index, value)
ints = [8, 23, 45, 12, 78]
index = 0
for value in (ints):
    index +=1
    print index, value
    if index >= len(ints)-1: # 重置index索引
        index = 0