A `for` loop iterates over any iterable — lists, strings, ranges, dict keys, files. `range(n)` produces integers `0..n-1` lazily.
python
total = 0
for i in range(1, 6):
total += i
# total == 15
for i, tx in enumerate(["mint", "burn"]):
print(i, tx)`enumerate` yields (index, value) pairs, and `zip` pairs up multiple iterables:
python
for name, price in zip(names, prices):
print(name, price)