Question

describe('DataService', () => {
    let service: DataService;
    let httpMock: HttpTestingController;

    beforeEach(() => {
        TestBed.configureTestingModule({
            imports: [HttpClientTestingModule],
            providers: [DataService]
        });

        // inject the service
        service = TestBed.get(DataService);
        httpMock = TestBed.get(HttpTestingController);
    });   

    it('can test for server error', () => {
        service.createEmployee(MOCK_EMPLOYEE[0]).subscribe((response) => {
         fail('should not respond with new employee')
        },
            (error: HttpErrorResponse) => {
                expect(error.error.status).toEqual(500);
            });

       let call: TestRequest = 
        httpMock.expectOne(`${service.baseUrl}/employees`);
        expect(call.request.method).toEqual('POST');
        call.error(
            new ErrorEvent('Server error'), { status: 500 }
        );
        httpMock.verify();
    });
}

我实际上只是试图构建一个程序来理解逻辑运算符。问题是它不断抛出此错误。

#!/usr/bin/env python3

status = False

while status == True:
    status == "retired"

def ageCheck():
    age = int(input("Enter Your Age: "))
    if ageCheck.age() >= 65 or age <18:
        status = True

def discountCheck():
    if (ageCheck.age() >= 65 and status == "retired") or ageCheck.age() < 18: 
        print("You get 5% off")

def welcome():
    print()
    print("Welcome to Age Test")


welcome()

ageCheck()

discountCheck()

Answer 1

agecheck是一个函数-您访问其age()属性，该属性没有任何属性-因此出错。

改为使用age。

当心作用域-status中的ageCheck()不是全局status，而是局部变量。您可以将status用作string或bool-取决于您的功能。

确定状态（是/否）和状态（是否退休）中的一个或使用2个不同的变量。

您可以像这样重写一些代码：

#!/usr/bin/env python3

def getAge():
    while True:
        age = input("Enter Your Age: ")

        if age.isdigit() and int(age) > 0: 
            return int(age)
        # repeat until number given

def isElegibleForDiscount(someAge, isRetired):
    return someAge < 18 or someAge >= 65 and isRetired # operator  precedence, no () needed 

def discountCheck(myAge,myStatus):
    if isElegibleForDiscount(myAge, myStatus == "retired"):
        print("You get 5% off")
    else:
        print("No discount, sorry.")

def welcome():
    print()
    print("Welcome to Age Test")


welcome()
age = getAge()
discountCheck(age,"retired")
discountCheck(age,"still kickin")

避免在解析非整数输入时出错，无需全局变量就传递变量，并简化逻辑检查。

17的输出：

Welcome to Age Test
Enter Your Age: 17
You get 5% off
You get 5% off

输出为65：

Welcome to Age Test
Enter Your Age: 65
You get 5% off
No discount, sorry.

HTH

Answer 2

由于@PatrickArtner，我能够使用构建程序时所用的初始IF语句来完成此操作。谢谢！！！

#!/usr/bin/env python3


def statusCheck(somage):
    if somage >= 65:
        return True
    else:
        return False

def ageCheck():
    while True:

        age = input("Enter Your Age: ")

        if age.isdigit() and int(age) > 0: 
            return int(age)

def discountCheck(someage, mystatus):
        if (someage >= 65 and mystatus == "isAble") or someage < 18: 
            print("You get 5% off")
        else:
            print("Age inacceptable")

def welcome():
    print()
    print("Welcome to Age Test")


welcome()

age = ageCheck()
statusCheck(age)

def ifstatus():
    if statusCheck(age) == True:
        status = "isAble"
        return str(status)

status =  ifstatus()

discountCheck(age, status)

我的逻辑运算符理解尝试

2 个答案: