示例代码 ..

```python

# 条件判断语句

a = 5

if a > 0:

    print("a是正数")

else:

    print("a是负数或0")

# 循环语句

i = 0

while i < 5:

    print(i)

    i += 1

# 遍历列表

words = ["Hello", "World", "!"]

for word in words:

    print(word)

```
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