Python Practice Example 12
Python 100 ExamplesProblem:Determine how many prime numbers there are between 101 and 200, and output all prime numbers.
Program analysis:Method to determine a prime number: divide the number by integers from 2 to sqrt(this number). If it is divisible, the number is not prime; otherwise, it is prime.
Program source code:
Example (Python 2.0+)
#!/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:
leap = 0
break
if leap == 1:
print ('%-4d' % m)
h += 1
if h % 10 == 0:
print ('')
leap = 1
print ('The total is %d' % h)
The output of the above example is:
101 103 107 109 113 127 131 137 139 149 151 157 163 167 173 179 181 191 193 197 199 The total is 21Other extensions