Python 程式設計/迴圈/解決方案

1. 編寫一個程式，用素數計數。要求使用者輸入一個數字，然後打印出小於該數字的每個素數。

對於這個程式，我們將建立一個包含所有可能的數字列表，直到使用者的輸入，然後使用費馬小定理測試每個數字，驗證它是素數，然後將該素數新增到素數列表中。最後，我們列印素數列表。

註釋：所有素數都滿足費馬小定理，但有些返回的結果是“偽素數”，它們不是素數（例如，341=11*31，在 python 中：(((2**341)-2)%341 == 0)). 有關尋找素數和證明素性的更多資訊

primes = []
                    # Creates a list that we will throw our prime numbers into.  
user = 1 + int(raw_input("What number would you like to count primes up to?  "))
                    # 1 is added on to the user's number so that their number
                    # is counted.  
list = range(2,user)
                    # 0 and 1 are not prime, but our algorithm registers them
                    # as prime, so we start with two
for possibility in list:
    if ((2**possibility)-2)%possibility == 0:
                    # Our algorithm (Fermat's little theorem)  states
                    # that if "i" is an integer and i^p-i divides evenly
                    # into p, p is prime.  We are using 2 in place of i.
                    # See Python Programming/Basic Math for more info.  		
        isprime = True
        test = 2
        while test < possibility and isprime:
                    # Here we verify that the number is in fact prime by
                    # starting at 2 and dividing it by every number lower 
                    # than the potential prime.  See comment above.
            if (possibility%test) == 0:
                    # This ends the while loop causing the next number
                    # to be tested.
                isprime = False
            test = test + 1
        if isprime:
                    # We add each prime to the primes list.  
            primes.append(possibility)
print ("The prime numbers from 0 to", user-1, "are: ")
for possibility in primes:
    print possibility
                    # Print out all the primes!

2. 指示使用者從 1 到 100 中選擇一個任意數字，然後在七次嘗試內猜出該數字。每次猜完之後，使用者必須告訴您他們選擇的數字是比您的猜測高、低還是等於您的猜測。

print "\nIn your head, pick a number between 1 and 100, \ni'll guess it with some hints:\n"
letsstart = raw_input("ready? input anything...\n")
uppers = 100
lowers = 0
guess = 50
boom = 0
for c in range(1,10):
	if boom == 0:
		print "guess: ",guess
		answer = raw_input("Was that\na. too low\nb. too high\nc.  thats right!\n")
		if answer == "c":
			print "I got it!  Thanks for playing.\n"
			boom = 1
		elif answer == "a":
			lowers = guess
			blah = int((uppers-guess)/2)
			guess = guess + blah
		elif answer == "b":
			uppers = guess
			blash = int((guess-lowers)/2)
			guess = guess-blash

"其他"

Python 的 9 年級作業是這樣的，這是一個猜數字的遊戲，包括了 python 的大多數方面。

print("welcome")
YourName = input("what is your name?")
print("hi",YourName,"do you want to play my game?")
import random
number = random.randrange(100)
guess =int(input("please guess the number"))
if guess == number:
    print("You've WON!!!!!")
elif guess > number:
    print("Too Big!")
else: 
     print("Too Low!")
while guess!= number:
    guess =int(input("please guess the number again"))
    if guess == number:
        print("You've Won!!")
    elif guess > number:
        print("too big")
    else:
        print("too low")