Repeat code efficiently.

For Loop

```python # Loop through list cities = ["Boston", "Portland", "Atlanta"]

for city in cities: print(city)

Loop through range for i in range(5): print(i) # 0, 1, 2, 3, 4 ```

While Loop

```python count = 0

while count < 5: print(count) count += 1 # Same as: count = count + 1 ```

Break and Continue

```python # Break - stop loop for i in range(10): if i == 5: break print(i) # 0, 1, 2, 3, 4

Continue - skip iteration for i in range(5): if i == 2: continue print(i) # 0, 1, 3, 4 ```

Loop with Index

```python names = ["Tom", "Sarah", "Mike"]

for index, name in enumerate(names): print(f"{index}: {name}") # 0: Tom # 1: Sarah # 2: Mike ```

Remember

- for loop for known iterations - while loop for unknown iterations - Use break to exit early