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python - 函数不返回转换后的变量类型

问题描述

我有一个任务，并创建了一个名为的函数，它根据步长的数量cycle_convert(variable, n)转换 a 的类型。我在 Python 中有以下固定的类型顺序：int → float → bool → string → complexvariablen

例如，我有变量number = 10，并使用我的函数cycle_convert(number, 2)将类型从 a 更改int为 a bool。它也适用于环绕和负步长。

我有完成这些任务的代码，但是在返回变量时，即使函数对其进行了转换，转换后的类型似乎也没有返回，并且变量number仍然是int. 我的代码如下：

def cycle_convert(x, n=1):
    if type(x) == int:
        num = 1
    elif type(x) == float:
        num = 2
    elif type(x) == bool:
        num = 3
    elif type(x) == str:
        num = 4
    elif type(x) == complex:
        num = 5
    prev_type = type(x)

    final_num = num + n
    while final_num not in range(1,6):
        if final_num <1:
            final_num = 5 + final_num
        if final_num >5:
            final_num = final_num - 5

    if final_num == 1:
        x = int(x)
    elif final_num == 2:
        x = float(x)
    elif final_num == 3:
        x = bool(x)
    elif final_num == 4:
        x = str(x)
    elif final_num == 5:
        x = complex(x)
    print('Your variable type has been changed from ', prev_type, 'to ', type(x), ': ')
    return x


number = 10
cycle_convert(number, 2)

谁能向我解释为什么 return 函数在这种情况下不起作用？

谢谢

标签： pythonfunctionif-statement

解决方案

我相信这个问题是一个错字。您正在定义您的函数来接受一个参数，并且p的默认值 = 1。但是稍后，在您的函数中，您正在评估一个变量，这意味着无论何时调用函数时传递的参数都不会生效。这应该有效：nnxp

def cycle_convert(x, n=1):
    if type(x) == int:
        num = 1
    elif type(x) == float:
        num = 2
    elif type(x) == bool:
        num = 3
    elif type(x) == str:
        num = 4
    elif type(x) == complex:
        num = 5
    prev_type = type(x)

    final_num = num + n
    while final_num not in range(1,6):
        if final_num <1:
            final_num = 5 + final_num
        if final_num >5:
            final_num = final_num - 5

    if final_num == 1:
        x = int(x)
    elif final_num == 2:
        x = float(x)
    elif final_num == 3:
        x = bool(x)
    elif final_num == 4:
        x = str(x)
    elif final_num == 5:
        x = complex(x)
    print('Your variable type has been changed from ', prev_type, 'to ', type(x), ': ')
    return x


number = 10
cycle_convert(number, 2)

输出：

Your variable type has been changed from  <class 'int'> to  <class 'bool'> :

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