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给定数的素数个数。

Syntax: primepi(n)

Parameter:
n – It denotes the number up to which the count of prime number is calculated.

Returns: Returns the number of prime numbers less than or equal to n.

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