大家求助一个python致命的猜数字程序的问题

大家求助一个python猜数字程序的问题
大家能不能帮忙看一下面这个问题，我想了一下要用到下面的要求不是很好写，请高手帮忙了。。。
for example, say the computer picks the number 1130 and the user chooses
1024. The computer will respond with 1B 1C. The 1 is in the correct position
and so is a bull (1B) and the 0 is a correct digit but in the wrong position
and so is a cow (1C). On the other hand, if the user chooses 1031 then
the computer will respond with 2B 2C as the first 1 and the 3 are in the
correct positions (2B) and the second 1 and the 0 are correct digits in the
wrong position (2C). When the user finally guesses the correct number the
computer will respond with 4B 0C which signifies that the number has been
guessed and the game has ended.

>>> bulls_and_cows()
Welcome to Bulls and Cows
How many digits? 4
Allow repeated digits (y or n)? n
Guess: 1123
Repeated digits
Guess: 112y
Must be digits
Guess: 123
Wrong number of digits
Guess: 12345
Wrong number of digits
Guess: 1234
3B 0C
Guess: 1235
2B 0C
Guess: 1264
3B 0C
Guess: 1274
4B 0C
Got it! Do you want another game with 4 digits (y or n) n
How many digits? 4
Allow repeated digits (y or n)? y
2
Guess: 1123
0B 1C
Guess: 2245
0B 2C
Guess: 6627
0B 2C
Guess: 8872
2B 2C
Guess: 7892
4B 0C
Got it! Do you want another game with 4 digits (y or n) y
Guess: 1123
0B 2C
Guess: 4451
0B 2C
Guess: 6715
0B 1C
Guess: 2345
0B 3C
Guess:
Do you give up (y or n)? y
The secret number is 3274
Do you want another game with 4 digits (y or n) n
How many digits? 0
>>>
1  Tasks
For each function that you write you need to provide a suitable comment
giving a description, the type and any preconditions. You should use the
triple-quote commenting style.
3

1.2 Write the code
Finally, write your solution to the assignment making sure you have included
suitable comments.
As you can see from the example above the main entry point is the function
bulls_and_cows. When called, this function provides the required interface.
To support this function you need to write the following four functions.
• make_secret(numdigits, repeat) that takes the number of digits for
the secret number and whether or not repeated digits are allowed and
returns the list of digit characters as the secret. A list is used rather
than a number for two reasons. First, it’s difficult to use a number when
we want leading zeros and second, it’s easier to compare the secret as
a list of digit characters with the users guess. This function should use
the random number module to generate the secret numbers.
Here are some examples (remember that this is generating random
numbers).
>>> make_secret(4, True)
[’1’, ’7’, ’8’, ’3’]
>>> make_secret(4, True)
[’1’, ’9’, ’2’, ’2’]
>>> make_secret(4, False)
[’3’, ’7’, ’0’, ’5’]
>>> make_secret(4, False)
[’2’, ’7’, ’1’, ’9’]
>>>
• score(secret, guess) that takes two lists of the same length and
returns, as a pair, the number of bulls and cows.
4
Here are some examples.
>>> score([’2’, ’7’, ’1’, ’9’], [’2’, ’1’, ’3’, ’5’])
(1, 1)
>>> score([’1’, ’9’, ’2’, ’2’], [’1’, ’3’, ’2’, ’3’])
(2, 0)
>>> score([’1’, ’9’, ’2’, ’2’], [’2’, ’2’, ’2’, ’3’])
(1, 2)
>>>
• check_guess(numdigits, repeat, guess) that takes the number of
digits of the secret, whether repeats are allowed and the user guess as a
list of digit characters and returns True if the guess is a valid guess or
False if the guess is invalid - i.e. it has the wrong number of digits, it
contains non-digit characters or (if repeats are not allowed) it contains
repeated digit characters. As a side effect it prints an error message of
the appropriate kind if an error is detected.
Here are some examples.
>>> check_guess(4, True, [’1’,’1’,’1’,’1’])
True
>>> check_guess(4, True, [’1’,’1’,’1’,’x’])
Must be digits
False
>>> check_guess(4, False, [’1’,’1’,’1’,’1’])
Repeated digits
False
>>> check_guess(4, False, [’1’,’2’,’3’])
Wrong number of digits
False
>>> check_guess(4, False, [’1’,’2’,’3’, ’4’])
True
>>>
• make_guess(numdigits, repeats, secret) that takes the number
of digits, whether repeats are allowed and the secret as a list of digit
characters. It is responsible for getting a guess from the user, checking
5
if the guess is empty and if not calculating and displaying the number
of bulls and cows and determining if the game is over. The function
should return one of three characters: ’c’ if the current game should
continue, ’y’ if the current game should end (either because the user
has guessed the secret or has given up) but the user wants another
game of the current style and ’n’ if the current game should end but
the user does not want another game of the current style.
Here are some examples.
>>> make_guess(4, False, [’1’, ’2’, ’3’, ’4’])
Guess: 2134
2B 2C
’c’
>>> make_guess(4, False, [’1’, ’2’, ’3’, ’4’])
Guess:
Do you give up (y or n)? n
’c’
>>> make_guess(4, False, [’1’, ’2’, ’3’, ’4’])
Guess:
Do you give up (y or n)? y
The secret number is 1234
Do you want another game with 4 digits (y or n) n
’n’
>>> make_guess(4, False, [’1’, ’2’, ’3’, ’4’])
Guess: 1234
4B 0C
Got it! Do you want another game with 4 digits (y or n) y
’y’
>>>
Note that the ’c’, ’n’ and ’y’ above are the displayed returns of the
function while the other parts of the display are due to the interaction
with the user.
6
You will find that the four functions above can be used either directly or
indirectly in the definition of the top-level function bulls_and_cows.