Iterate a Python list and get the index and value

You can get indices and values of a list in for loop using Python built-in enumerate().

a = ['sun', 'earth', 'moon']

for index, value in enumerate(a):
    print(index)
    print(value)

# 0
# sun
# 1
# earth
# 2
# moon

If not using enumerate, only items are printed in order.

a = ['sun', 'earth', 'moon']

for i in a:
    print(i)

# sun
# earth
# moon

Items of an enumerate object

a = ['sun', 'earth', 'moon']

b = enumerate(a)

print(b)  # <enumerate object at 0x117736140>

for i in b:
    print(i)
    print(type(i))

# (0, 'sun')
# <class 'tuple'>
# (1, 'earth')
# <class 'tuple'>
# (2, 'moon')
# <class 'tuple'>

The enumerate() returns a enumerate object that can be iterated. Each item of it is a tuple of index and value.