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以下是几个 Python 练习实例：
1. 打印 "Hello, World!"
```python
print("Hello, World!")
```
2. 计算两个数的和
```python
num1 = int(input("输入第一个数: "))
num2 = int(input("输入第二个数: "))
sum = num1 + num2
print("两个数的和为: ", sum)
```
3. 判断一个数是奇数还是偶数
```python
num = int(input("输入一个整数: "))
if num % 2 == 0:
print(num, "是偶数")
else:
print(num, "是奇数")
```
4. 判断一个年份是否是闰年
```python
year = int(input("输入一个年份: "))
if (year % 4 == 0) and (year % 100 != 0) or (year % 400 == 0):
print(year, "是闰年")
else:
print(year, "不是闰年")
```
5. 猜数字游戏，计算用户猜测次数
```python
import random
number = random.randint(1, 100)
guess = 0
count = 0
while guess != number:
guess = int(input("猜一个1到100之间的数字: "))
count += 1
if guess > number:
print("太大了，请再猜一次")
elif guess < number:
print("太小了，请再猜一次")
else:
print("你猜对了！你一共猜了", count, "次")
```
希望这些例子可以帮助您练习 Python 编程。