编程迭代案例怎么写的

时间:2025-01-23 20:23:39 游戏攻略

编程迭代案例可以通过以下步骤来编写:

选择迭代对象:

确定你要遍历的数据结构,如列表、元组、字典、字符串等。

选择迭代方式:

根据需求选择遍历方式,例如逐个元素遍历、按键遍历、按值遍历或同时遍历键和值。

编写迭代代码:

使用适当的循环结构(如`for`循环)来实现迭代,并在每次迭代中执行相应的操作。

处理迭代结果:

在迭代过程中,可以对数据进行处理,如计算、输出或修改。

考虑边界条件和异常处理:

确保迭代过程中能够正确处理空数据结构等特殊情况。

示例1:遍历列表

```python

permanent = ['李晨', '郑凯', '沙溢', '白鹿', '周琛', '范丞丞', '宋雨琦', '张真源']

for per in permanent:

print(per)

```

示例2:按键遍历字典

```python

permanent = {"李小晨": "李晨", "郑小凯": "郑凯", "沙小溢": "沙溢", "白小鹿": "白鹿", "周小琛": "周琛", "范小丞": "范丞丞", "宋小琦": "宋雨琦", "张小源": "张真源"}

for key in permanent:

print(key)

```

示例3:按值遍历字典

```python

permanent = {"李小晨": "李晨", "郑小凯": "郑凯", "沙小溢": "沙溢", "白小鹿": "白鹿", "周小琛": "周琛", "范小丞": "范丞丞", "宋小琦": "宋雨琦", "张小源": "张真源"}

for value in permanent.values():

print(value)

```

示例4:同时遍历键和值

```python

permanent = {"李小晨": "李晨", "郑小凯": "郑凯", "沙小溢": "沙溢", "白小鹿": "白鹿", "周小琛": "周琛", "范小丞": "范丞丞", "宋小琦": "宋雨琦", "张小源": "张真源"}

for key, value in permanent.items():

print(f'{key} -> {value}')

```

示例5:计算班级成绩平均分

```python

scores = [85, 92, 78, 95, 88]

total = 0

for score in scores:

total += score

average = total / len(scores)

print(f'平均分是:{average}')

```

示例6:每日零花钱记录

```python

money = [5, 10, 8, 12, 6]

for daily in money:

if daily > 8:

print(f'这天花了{daily}元,有点多哦')

```

示例7:同时遍历两个列表

```python

names = ['小明', '小红', '小华']

scores = [98, 89, 92]

for n, s in zip(names, scores):

print(f'{n}的分数是{s}分')

```

示例8:倒着遍历

```python

names = ['小明', '小红', '小华']

for name in reversed(names):

print(name)

```

示例9:求解方程的简单迭代法

```matlab

function [x_reality,n_reality] = Simple_stepit(f_name,x_start,tolerance,n_limit)

x_reality = x_start;

n_reality = 0;

while (n_reality < n_limit)

n_reality = n_reality + 1;

x_reality = feval(f_name,x_reality);

if (abs(x_reality - x_start) <= tolerance)

break;

end

end

```

这些案例展示了如何使用迭代在不同场景下处理数据,从简单的列表遍历到复杂的数值计算和方程求解。根据具体需求,可以灵活选择迭代方式和处理逻辑。