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Python 入門指南 V2.00 - 單元 19 範例及練習程式碼



encrypt07.py


# 使用 randint()
import random

# 定義 Encrypt 類別 
class Encrypt:
   def __init__(self):
      self.setcode()

   def setcode(self):
      # 取得 a 、 b 值
      a = 0
      b = 0
      while a % 2 == 0: 
         a = random.randint(0, 9)
         b = random.randint(0, 9) 

      # 利用公式建立密碼表
      self.code = ""
      c = "a"
      i = 0
      while i < 26:
         x = c
         y = ord(x) * a + b
         m = y % 26
         self.code += chr(m + 97)
         c = chr(ord(c) + 1)
         i += 1

   def getcode(self):
      return self.code

   # 編碼的方法
   def toEncode(self, str):
      # 暫存編碼結果的字串
      result = ""

      # 利用迴圈走完參數字串的所有字元
      for c in str:
         # 判斷該字元是否為英文小寫字母
         # 若是英文小寫字母就進行編碼轉換
         c1 = ord(c) >= 97
         c2 = ord(c) <= 122
         if c1 and c2:
            m = ord(c) - 97
            result += self.code[m]
         else:
            result += c

      # 結束回傳編碼過的字串
      return result

   # 解碼的方法 
   def toDecode(self, str):
      # 暫存解碼結果的字串
      result = ""

      i = 0
      # 第一層迴圈逐一取得每一個字元
      while i < len(str):
         # 判斷該字元是否為英文小寫字母
         # 若是英文小寫字母就進行解碼轉換
         i1 = ord(str[i]) >= 97
         i2 = ord(str[i]) <= 122
         if i1 and i2:
            j = 0
            # 第二層迴圈尋找該字元在密碼表中
            # 的索引值,加上 DIFF 就可轉換
            # 回原本的字元
            while j < len(self.code):
               if str[i] == self.code[j]:
                  result += chr(j + 97)
               j += 1
         else:
            result += str[i]

         i += 1

      # 結束回傳解碼過的字串
      return result

# 測試部分
if __name__ == '__main__':
   e = Encrypt()
   print()
   print(e.getcode())
   s1 = "There is no spoon."
   print("Input : " + s1)
   s2 = e.toEncode(s1)
   print("Encode: " + s2)
   s3 = e.toDecode(s2)
   print("Decode: " + s3)
   print()
 
# 檔名: encrypt07.py 
# 作者: Kaiching Chang 
# 時間: July, 2014

exercise1901.py


from random import shuffle

while True:
   answer = [chr(i) for i in range(48, 58)]
   shuffle(answer)
   answer = answer[0:4]
   if answer[0] != "0":
      break

def ab_counter(answer, guess, ab):
   a = 0
   b = 0
   for i in guess:
      if i in answer:
         if guess.index(i) == answer.index(i):
            a += 1
         else:
            b += 1

   ab[0] = a
   ab[1] = b

def find_number(array):
   for i in array:
      if array.count(i) > 1:
         return True      

   return False

if __name__ == "__main__":
   abcounter = [0, 0]
   times = 0
   while True:
      times += 1
      guess = input(": ")
      if len(guess) != 4:
         print("Wrong length!!")
         continue
      if find_number(guess):
         print("Repeating digits!!")
         continue
      ab_counter(answer, guess, abcounter)
      if abcounter[0] == 4:
         print("Right!!")
         break
      else:
         print(str(abcounter[0]) + "A" + str(abcounter[1]) + "B")

   print("You guess " + str(times) + " times.")
 
# 檔名: exercise1901.py 
# 作者: Kaiching Chang 
# 時間: July, 2014

exercise1902.py


from random import shuffle

class GuessGame:
   def __init__(self):
      self.set_game();

   def set_game(self):
      while True:
         self.answer = [chr(i) for i in range(48, 58)]
         shuffle(self.answer)
         self.answer = self.answer[0:4]
         if self.answer[0] != "0":
            break
      
      self.times = 0
      self.a = 0
      self.b = 0

if __name__ == "__main__":  
   g = GuessGame()
   print(g.answer)
 
# 檔名: exercise1902.py 
# 作者: Kaiching Chang 
# 時間: July, 2014

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