如何在循环python中积累

Question

我是编程新手，我在循环中累积有困难

    wrong_guesses=0
    formSoFar=''
    game_over=False
    while (game_over==False and wrong_guesses<max_guesses):
        guess1= raw_input("Please enter an operation symbol or digit: ")
        if (guess1 in formula):
            print "Your guess is correct!"
            for i in range (len(formula)):
                if (randomFormula[i] == guess1):
                    formSoFar += formula[i]
                else:
                    formSoFar+= "-"
            print "The formula you have guessed so far is: ",formSoFar

假设用户试图猜测的等式是1 + 2 + 3并且他们的第一次猜测是2，formSoFar是--2--但他们第二次猜测它应该显示第一个猜测，所以如果他们猜测1它应该是1-2--但是这个代码是打印 - 2--1-2-- 请帮忙:(

Answer 1

在每个循环中，您将字符附加到formSoFar。你要做的是让它从一些值开始并在你去的时候进行编辑：

formSoFar = ['-'] * len(formula)

while not game_over and wrong_guesses < max_guesses:
    guess = raw_input(...)
    if guess in formula:
        for i, c in enumerate(formula):
            if c == guess:
                formSoFar[i] = c

        print 'The formula you have guessed so far is:', ''.join(formSoFar)

另请注意，您在()声明中不需要if。那是一个C / C ++ / Java的东西。