In this program, we have checked if num is prime or not. Numbers less than or equal to 1 are not prime numbers. Hence, we only proceed if the num is greater than 1. We check if num is exactly divisible by any number from 2 to num - 1. If we find a factor in that range, th...
prime number python代码 primes在python 1.题目 2.代码 import os import sys # 请在此输入您的代码 def countPrimes(n): primes=[1]*n count=0 li=[] for i in range(2,n): if primes[i]: count+=1 li.append(i) for j in range(i*i,n,i): primes[j]=0 return count,li n=int(input...
下面是经过优化的素数判断函数: defis_prime(n):ifn<=1:returnFalseifn==2:returnTrueifn%2==0:returnFalseforiinrange(3,int(n**0.5)+1,2):ifn%i==0:returnFalsereturnTrue 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 结语 本文介绍了素数的定义,并使用Python编写了一个函数来判断一个数是否...
""" 输出100以内的素数 Version: 1.0 Author: 骆昊 """ for num in range(2, 100): is_prime = True for i in range(2, int(num ** 0.5) + 1): if num % i == 0: is_prime = False break if is_prime: print(num) 例子2:斐波那契数列 要求:输出斐波那契数列中的前20个数。 说明...
Here is a Python program to print prime numbers from 1 to n. def sieve_of_eratosthenes(n): primes = [True] * (n + 1) p = 2 while p**2 <= n: if primes[p]: for i in range(p**2, n + 1, p): primes[i] = False ...
importjava.util.Scanner;publicclassHappyProgram{publicstaticvoidmain(String args[]){Scannerinput_a=newScanner(System.in); System.out.print("Enter a number: ");intYourNumber=input_a.nextInt();if(YourNumber >10) System.out.println("Your number is greater than ten") ;if(YourNumber <=10) ...
# See if num is divisible by any number up to the square root of num: for i in range(2, int(math.sqrt(num)) + 1): if num % i == 0: return False return True 第18 行使用模运算符(%)检查余数是否为 0。如果余数为 0,num可被i整除,因此不是质数,循环返回False。如果第 17 行上的...
# this program will overwrite that file: outputFilename = 'frankenstein.encrypted.txt' myKey = 10 myMode = 'encrypt' # Set to 'encrypt' or 'decrypt'. # If the input file does not exist, the program terminates early: if not os.path.exists(inputFilename): ...
Back to normal. ① 上下文管理器是LookingGlass的一个实例;Python 在上下文管理器上调用__enter__,结果绑定到what。 ② 打印一个str,然后打印目标变量what的值。每个print的输出都会被反转。 ③ 现在with块已经结束。我们可以看到__enter__返回的值,保存在what中,是字符串'JABBERWOCKY'。
一、单选题（每题2分，共30分）1.在Python中，以下哪个关键字用于定义函数？A. def B. function C. define D. fn 2.以下代码的输出结果是：a = 5 b = 3 print(a / b)A. 1 B. 1.6666666666666667 C. 2 D. 1.5 3.以下哪种数据类型是不可变的？A.列表（list）B.字典（dict）C.元组（tuple...