`enumerate()`: Index + Value in One Go

The manual way

fruits = ["apple", "banana", "cherry"]
index = 0
for fruit in fruits:
    print(index, fruit)
    index += 1

# 0 apple
# 1 banana
# 2 cherry

Using enumerate

fruits = ["apple", "banana", "cherry"]
for index, fruit in enumerate(fruits):
    print(index, fruit)

# 0 apple
# 1 banana
# 2 cherry

With custom start

fruits = ["apple", "banana", "cherry"]
for index, fruit in enumerate(fruits, start=1):
    print(index, fruit)

# 1 apple
# 2 banana
# 3 cherry

Conclusion

enumerate() saves you from writing extra lines to handle counters. It makes loops cleaner and more Pythonic.