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。