all Python 3Loopsfunction

enumerate()

iteration

Built-in function that adds a counter to an iterable. It returns (index, value) tuples. The start parameter sets the initial index.

Syntax

enumerate(iterable, start=0)

enumerate frees you from the clumsy range(len(...)) walk with manual indexing — it hands you the (index, value) pair directly. It returns a lazy iterator, not a list, so wrap it in list() only when you actually need the whole result at once.

Examples

fruits = ["яблоко", "банан", "вишня"]
for i, fruit in enumerate(fruits):
    print(i, fruit)  # → 0 яблоко / 1 банан / 2 вишня
for i, fruit in enumerate(fruits, start=1):
    print(f"{i}. {fruit}")  # → 1. яблоко / 2. банан / 3. вишня

lst = [10, 20, 30, 40]
for i, v in enumerate(lst):
    if v == 20:
        print("индекс 20:", i)  # → индекс 20: 1

nums = [5, 3, 8, 1]
max_i, max_v = max(enumerate(nums), key=lambda x: x[1])
print(max_i, max_v)  # → 2 8
print(dict(enumerate("abc")))  # → {0: 'a', 1: 'b', 2: 'c'}

See also

Common errors

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