python菜鸟教程100例
python新手编程100例
1. 输出 "Hello, World!"
```python
print("Hello, World!")
```
2. 计算两个数字的和
```python
num1 = 1
num2 = 2
sum = num1 + num2
print("两个数字的和为：", sum)
```
3. 判断一个数是正数、负数还是零
```python
num = 10
if num > 0:
    print("正数")
elif num < 0:
    print("负数")
else:
    print("零")
```
4. 判断一个数是否为素数
```python
num = 7
if num > 1:
  for i in range(2, num):
      if (num % i) == 0:
          print(num, "不是素数")
          break
  else:
      print(num, "是素数")
else:
  print(num, "不是素数")
```
5. 求一个数的阶乘
```python
num = 5
factorial = 1
if num < 0:
  print("负数没有阶乘")
elif num == 0:
  print("0 的阶乘为 1")
else:
  for i in range(1, num + 1):
      factorial = factorial * i
  print(num, "的阶乘为", factorial)
```
6. 判断一个字符串是否为回文字符串
```python
string = "level"
if string == string[::-1]:
  print(string, "是回文字符串")
else:
  print(string, "不是回文字符串")
```
7. 打印九九乘法表
```python
for i in range(1, 10):
  for j in range(1, i + 1):
      print(i, "*", j, "=", i * j, end="\t")
  print()
```
8. 判断一个年份是否为闰年
```python
year = 2020
if (year % 4 == 0 and year % 100 != 0) or year % 400 == 0:
  print(year, "是闰年")
else:
  print(year, "不是闰年")
```
9. 转换华氏温度为摄氏温度
```python
fahrenheit = 100
celsius = (fahrenheit - 32) * 5 / 9
print("华氏温度", fahrenheit, "对应的摄氏温度为", celsius)
```
10. 计算斐波那契数列
```python
def fibonacci(n):
  if n <= 0:
      return "输入的数字必须大于 0"
  elif n == 1:
      return 0
  elif n == 2:
      return 1
  else:
      return fibonacci(n-1) + fibonacci(n-2)
num = 10
for i in range(1, num+1):
  print(fibonacci(i), end=" ")
```

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