import mathimport timedefis_prime(num):if num == 2: returnTrueif num <= 1ornot num % 2: returnFalsefor div in range(3, int(math.sqrt(num) + 1), 2): ifnot num % div: returnFalsereturnTruedefrun_program(N): total = 0for i in range(N): if is_prime(i)...
for seqLen in range(3, 6): for seqStart in range(len(message) - seqLen): # Determine what the sequence is and store it in seq: seq = message[seqStart:seqStart + seqLen] # Look for this sequence in the rest of the message: for i in range(seqStart + seqLen, len(message) - ...
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# Program to check if a number is prime or not num = 29 # To take input from the user #num = int(input("Enter a number: ")) # define a flag variable flag = False if num == 0 or num == 1: print(num, "is not a prime number") elif num > 1: # check for factors for...
上下文管理器对象存在以控制with语句,就像迭代器存在以控制for语句一样。 with语句旨在简化一些常见的try/finally用法,它保证在代码块结束后执行某些操作,即使代码块由return、异常或sys.exit()调用终止。finally子句中的代码通常释放关键资源或恢复一些临时更改的先前状态。
others: Twisted, for example, is mostly focused on production servers, where supporting older versions of Python is important, let alone supporting a new version that includes major changes to the language. (Twisted is a prime example of a major package where porting to 3.x is far from trivi...
选择文件 -> 新文件,打开新文件编辑器窗口。在文件编辑器中输入以下代码,保存为transpositionfilecipher.py。然后从www.nostarch.com/crackingcodes下载frankenstein.txt,并将该文件放在与transpositoinfilecipher.py文件相同的文件夹中。按F5运行程序。 换位
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 ...
def prime(i): #定义函数,判断i是否为素数 if i<=: #如果小于等于1,返回0(i不是素数) return if i==: #如果等于2,返回1(i是素数) return for j in range(,i): #判断i是否为素数 if i%j==: #i可以被j除尽,余数为0 return #返回0,i不是素数 elif i!=j+: #如果i不等于j+1,继续 conti...
import math import time def is_prime(num): if num == 2: return True if num <= 1 or not num % 2: return False for div in range(3, int(math.sqrt(num) + 1), 2): if not num % div: return False return True def run_program(N): total = 0 for i in range(N): if is_pr...