Question

我尝试创建一个函数，使用它来进行数学运算，如（加法和乘法），我能够提示值，当我插入值时，结果不会按预期返回。 enter image description here

代码

def addition(num1,num2):    
    return num1+num2 def
multiplication(num1,num2):
    return num1*num2

print("1.addition") 
print("2.multiplication") 
choice  = int(input("Enter Choice 1/2"))


num1 = float(input("Enter First Number:")) 
num2 = float(input("Enter Second Number:")) 
sum = float(num1)+float(num2) 
multiply = float(num1)*float(num2) 
if choice == 1:     
    print("additon of {0} and {1} is".format(num1,num2, sum)) 
elif choice == 2:   
    print("additon of {0} and {1} is".format(num1,num2, multiply))

Answer 1

您缺少结果的位置说明符。由于您有三个参数，因此需要指定三个位置。

@Component({
  selector: 'my-app',
  template: `
    <button (click)="dec()">-</button>
    <button (click)="inc()">+</button>

    <div [style]="style"> My height is set by CSS Variable </div>
  `,
  styles: [`
    div {
      height: var(--height);
    }
    `
  ]
})
export class AppComponent {
  height = 50;

  get style() {
    return this.sanitizer.bypassSecurityTrustStyle(`--height: ${this.height}px`);
  }

  constructor(private sanitizer: DomSanitizer) { }

  inc() {
    this.height += 10;
  }


  dec() {
    this.height -= 10;
    if (this.height <= 0) {
      this.height = 0;
    }
  }
}

Answer 2

您不需要这些功能，也不需要sum或multiply个变量，只需将操作放在str.format()中，您就错过了最后一个位置。

# def addition(num1,num2):  
#     return num1+num2
# def multiplication(num1,num2):
#     return num1*num2

print("1.addition")
print("2.multiplication") 
choice = int(input("Enter Choice 1/2"))

num1 = float(input("Enter First Number:"))
num2 = float(input("Enter Second Number:"))
# sum = float(num1)+float(num2)
# multiply = float(num1)*float(num2) 
if choice == 1: 
    print("additon of {0} and {1} is {2}".format(num1,num2, num1 + num2))
elif choice == 2:
    print("additon of {0} and {1} is {2}".format(num1, num2, num1 * num2))

并且知道你可以使用fstrings（＆gt; = Python 3.6）：

if choice == 1:
   print(f"additon of {num1} and {num2} is {num1 + num2}")
elif choice == 2:
   print(f"additon of {num1} and {num2} is {num1 * num2}")

旧式格式：

if choice == 1:
   print("additon of %s and %s is %s" % (num1,num2, num1 + num2))
elif choice == 2:
   print("additon of %s and %s is %s" % (num1, num2, num1 * num2))

或字符串连接：

if choice == 1:
   print("additon of " + num1 + " and " + num2 + " is " + (num1 + num2))
elif choice == 2:
   print("additon of " + num1 + " and " + num2 + " is " + (num1 * num2))

每个人都采用不同的方式，有时候了解所有这些方法很有用。

Python中的添加功能无法按预期工作

2 个答案: