Python | sympy.primpi()方法
原文:https://www.geeksforgeeks.org/python-sympy-primepi-method/
借助 sympy.primepi() 方法，我们可以求出小于等于给定数的素数个数。
语法: primepi(n)
参数: n–表示计算素数个数的个数。
返回:返回小于或等于 n 的素数。
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
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
