Python sympy.primepi()方法

在sympy.primepi()方法的帮助下，我们可以找到小于或等于一个给定数的质数的数量。

语法: primepi(n)

参数 :
n –它表示计算质数的数字，直到该数字为止。

返回：返回小于或等于**n*的质数的数量。

示例 #1:

# import primepi() method from sympy
from sympy import primepi
  
n = 10
  
# Use primepi() method 
count_primes = primepi(n) 
      
print("The number of prime numbers less than or equal to {} is {}".format(n, count_primes))

输出:

The number of prime numbers less than or equal to 10 is 4

示例 #2:

# import primepi() method from sympy
from sympy import primepi
  
n = 150
  
# Use primepi() method 
count_primes = primepi(n) 
      
print("The number of prime numbers less than or equal to {} is {}".format(n, count_primes))          

输出:

The number of prime numbers less than or equal to 150 is 35