[调用函数[closed]时python中的语法错误

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下面给出的代码在代码（dictionary.get（option））的倒数第二行中有一些语法错误。请告诉我错误。

CALCULATOR

def switch():
    print('Choose the option from the given below: \n 1 Addition \n 2 Subtraction \n 3 Multiplication \n 4 Division')
    option=int(input('Your option : '))
    def add():
        x1 = float(input('Enter the first value : '))
        x2 = float(input('Enter the second value : '))
        print('The sum of these values is : {}'.format(x1+x2))
    def sub():
        x1 = float(input('Enter the first value : '))
        x2 = float(input('Enter the second value : '))
        print('The difference of these values is : {}'.format(x1-x2))
    def mul():
        x1 = float(input('Enter the first value : '))
        x2 = float(input('Enter the second value : '))
        print('The product of these values is : {}'.format(x1*x2))
    def div():
        x1 = float(input('Enter the first value : '))
        x2 = float(input('Enter the second value : '))
        print('The division of these values is : {}'.format(x1/x2))

    dictionary = {
        1 : add,
        2 : sub,
        3 : mul,
        4 : div
    }

    dictionary.get(option){}

switch()

Answer 1

好的，您错过的是函数调用，您需要使用()来调用函数，但是您在倒数第二行中使用了{}。只需更改

dictionary.get(option){}

to

dictionary.get(option)()

这应该对您来说很好。整个代码

def switch():
    print('Choose the option from the given below: \n 1 Addition \n 2 Subtraction \n 3 Multiplication \n 4 Division')
    option=int(input('Your option : '))
    def add():
        x1 = float(input('Enter the first value : '))
        x2 = float(input('Enter the second value : '))
        print('The sum of these values is : {}'.format(x1+x2))
    def sub():
        x1 = float(input('Enter the first value : '))
        x2 = float(input('Enter the second value : '))
        print('The difference of these values is : {}'.format(x1-x2))
    def mul():
        x1 = float(input('Enter the first value : '))
        x2 = float(input('Enter the second value : '))
        print('The product of these values is : {}'.format(x1*x2))
    def div():
        x1 = float(input('Enter the first value : '))
        x2 = float(input('Enter the second value : '))
        print('The division of these values is : {}'.format(x1/x2))

    dictionary = {
        1 : add,
        2 : sub,
        3 : mul,
        4 : div
    }

    dictionary.get(option)()

switch()

Answer 2

语法错误在dictionary.get(option) {}语句中。将其更改为dictionary.get(option)。

这是您的带有更正的代码：

#################################      CALCULATOR     ####################################
def switch():
    print('Choose the option from the given below: \n 1 Addition \n 2 Subtraction \n 3 Multiplication \n 4 Division')
    option=int(input('Your option : '))
    def add():
        x1 = float(input('Enter the first value : '))
        x2 = float(input('Enter the second value : '))
        print('The sum of these values is : {}'.format(x1+x2))
    def sub():
        x1 = float(input('Enter the first value : '))
        x2 = float(input('Enter the second value : '))
        print('The difference of these values is : {}'.format(x1-x2))
    def mul():
        x1 = float(input('Enter the first value : '))
        x2 = float(input('Enter the second value : '))
        print('The product of these values is : {}'.format(x1*x2))
    def div():
        x1 = float(input('Enter the first value : '))
        x2 = float(input('Enter the second value : '))
        print('The division of these values is : {}'.format(x1/x2))

    dictionary = {
        1 : add,
        2 : sub,
        3 : mul,
        4 : div
    }

    dictionary.get(option)

switch()