---
id: practical-python-2.13
source_exercise_id: "2.13"
title: "Counting"
section: "2.4 Sequences"
source_path: "02_Working_with_data/04_Sequences.md"
source_repo: "https://github.com/dabeaz-course/practical-python"
source_commit: "93dca856b41c61a0a0f85ae334116e4c125629ea"
student_visible_solution: false
has_private_solution: false
skip: false
---

# Exercise 2.13: Counting

> Source: Practical Python Programming, `02_Working_with_data/04_Sequences.md`.

### Exercise 2.13: Counting

Try some basic counting examples:

```python
>>> for n in range(10):            # Count 0 ... 9
        print(n, end=' ')

0 1 2 3 4 5 6 7 8 9
>>> for n in range(10,0,-1):       # Count 10 ... 1
        print(n, end=' ')

10 9 8 7 6 5 4 3 2 1
>>> for n in range(0,10,2):        # Count 0, 2, ... 8
        print(n, end=' ')

0 2 4 6 8
>>>
```

## 关联来源

- [[summaries/04_Sequences]]