YouTipPython Exercise Example12
# Python2.x Python Exercise Instance 12
[ Python 100 Examples](#)
**Question:** Determine how many prime numbers there are between 101 and 200, and output all prime numbers.
**Program Analysis:** The method to determine a prime number: divide the number by all integers from 2 to sqrt(this number). If it can be divided evenly, it indicates that this number is not a prime number; otherwise, it is a prime number.
Program source code:
## Instance(Python 2.0+)
```python
#!/usr/bin/python
# -*- coding: UTF-8 -*-
h = 0
leap = 1
from math import sqrt
from sys import stdout
for m in range(101,201):
k = int(sqrt(m + 1))
for i in range(2,k + 1):
if m % i == 0: