python - 缩进错误: unindent does not match any outer indentation

Question

我正在阅读的书建议我使用函数、while 和 if 编写一个程序。

该计划的目的是:

Take 4 numbers from the user, 2 will be summed, 2 will be subtracted.
There are 3 functions. One is procedure_1, it is a while, it is supposed to take numbers from the user and continue the process until sum reaches <= 100 and sub reaches a value of <= 100, it also puts the results of these procedures on a list. In case it does, start() function has an if that, in case it reaches those values, it will run procedure_2, which prints a message and also prints the results of the lists.

这是代码，但我得到:

print "Results of sum and subtract:... %d, %d" % (sum, rest)
                                                               ^
IndentationError: unindent does not match any outer indentation

 

    sum = 0
rest = 0
results = []
results_2 = []

def procedure_1():
    while sum <= 100 and rest <= 100:
        print "What numbers do you wish to sum and subtract?"
        n1 = raw_input("Sum Num1:...") 
        n2 = raw_input ("Sum num2:...")
        ns1 = raw_input("Sub Num 1:...")
        ns2 = raw_input ("Sub Num 2:...")

        inner_sum = n1 + n2
        inner_rest = ns1 - ns2

        print "Results of sum and subtract:... %d, %d" % (inner_sum, inner_rest)
        results.append(inner_sum); results_2.append(inner_rest)

        sum += inner_sum
        rest += inner_rest

def procedure_2():
    print "Values are too high to compute your stuff"
    for inner_sum in results:
    print sum
    for inner_rest in results_2:
        print rest


def start():
    if sum < 100 and rest < 100:
        procedure_1()
    else:
        procedure_2()

start()

检查并仔细检查它，仍然无法运行它并看看它出了什么问题，非常感谢有关如何使该代码工作的建议。多谢。

编辑。 我收到这个新错误:分配之前引用了局部变量“sum”。尝试将全局的放在开始位置，也将它们删除，但没有运气。 Book也没有向我提到过这一点。

Answer 1

您需要使这些行的缩进与 while 循环体的其余部分匹配:

        n1 = raw_input("Sum Num1:...") 
        n2 = raw_input ("Sum num2:...")
        ns1 = raw_input("Sub Num 1:...")
        ns2 = raw_input ("Sub Num 2:...")

所以它看起来像这样:

def procedure_1():
    while sum <= 100 and rest <= 100:
        sum = n1 + n2; rest = ns1 - ns2
        print "What numbers do you wish to sum and subtract?"
        n1 = raw_input("Sum Num1:...") 
        n2 = raw_input ("Sum num2:...")
        ns1 = raw_input("Sub Num 1:...")
        ns2 = raw_input ("Sub Num 2:...")
        print "Results of sum and subtract:... %d, %d" % (sum, rest)
        results.append(sum); results_2.append(rest)

        sum += sum; rest += rest

但是，您可能还想在请求输入后移动总和等的计算:

def procedure_1():
    while sum <= 100 and rest <= 100:
        print "What numbers do you wish to sum and subtract?"
        n1 = raw_input("Sum Num1:...") 
        n2 = raw_input ("Sum num2:...")
        ns1 = raw_input("Sub Num 1:...")
        ns2 = raw_input ("Sub Num 2:...")

        # Note: It's generally considered bad form to use semicolons in Python.
        sum = n1 + n2
        rest = ns1 - ns2

        print "Results of sum and subtract:... %d, %d" % (sum, rest)
        results.append(sum); results_2.append(rest)

        sum += sum
        rest += rest

最后，您不希望两个不同的变量具有相同的名称，因此您的内部变量需要具有不同的名称，以免掩盖全局变量:

def procedure_1():
    while sum <= 100 and rest <= 100:
        print "What numbers do you wish to sum and subtract?"
        n1 = raw_input("Sum Num1:...") 
        n2 = raw_input ("Sum num2:...")
        ns1 = raw_input("Sub Num 1:...")
        ns2 = raw_input ("Sub Num 2:...")

        inner_sum = n1 + n2
        inner_rest = ns1 - ns2

        print "Results of sum and subtract:... %d, %d" % (inner_sum, inner_rest)
        results.append(inner_sum); results_2.append(inner_rest)

        sum += inner_sum
        rest += inner_rest

最后，由于 sum 和 rest 是您想要从函数内部修改的全局变量，因此您需要注意，您想要写入全局变量版本:

def procedure_1():
    # This says to write to the global variables rather than creating local ones.
    global sum, rest

    while sum <= 100 and rest <= 100:
        print "What numbers do you wish to sum and subtract?"
        n1 = raw_input("Sum Num1:...") 
        n2 = raw_input ("Sum num2:...")
        ns1 = raw_input("Sub Num 1:...")
        ns2 = raw_input ("Sub Num 2:...")

        inner_sum = n1 + n2
        inner_rest = ns1 - ns2

        print "Results of sum and subtract:... %d, %d" % (inner_sum, inner_rest)
        results.append(inner_sum); results_2.append(inner_rest)

        sum += inner_sum
        rest += inner_rest

(另请注意，sum 是 Python 中的函数，因此您可能希望将变量命名为其他名称。)