034 if elif else statements tủ tài liệu training

if-elif-else statements In previous lesson, we have learned if-else statements In this lesson, we are going to see if-elif-else statements if-elif-else blocks Sometimes a situation arises when there are several conditions To handle this situation Python allows us adding any number of elif clause after an if and before an else clause Here is the syntax of if-elif-else statement: if expression1: something elif expression2: something else elif expression3: something else else: another thing In our programs, we can create as many elif blocks as we need also it's not mandatory to write else In if - elif - else statements, which condition is satisfied the program executes that condition block and the if block is ended The Complete Python Programming Course: (Beginner to Advanced) In [1]: print(""" =========================== Simple Calculator =========================== Please select an operation: 1) Add 2) Subtract 3) Multiply 4) Divide """) choice = input("Please enter a choice(1/2/3/4):") num1 = int(input("Enter first number: ")) num2 = int(input("Enter second number: ")) if choice == '1': print(num1,"+",num2,"=", num1+num2) elif choice == '2': print(num1,"-",num2,"=", num1-num2) elif choice == '3': print(num1,"*",num2,"=", num1*num2) elif choice == '4': print(num1,"/",num2,"=", num1/num2) else: print("Invalid input") =========================== Simple Calculator =========================== Please select an operation: 1) Add 2) Subtract 3) Multiply 4) Divide Please enter a choice(1/2/3/4):1 Enter first number: Enter second number: + = Python Program to Calculate Grade of Student In [2]: mark = float(input("Please, enter your score: ")) if mark >= 90: print('Your grade is : A+') elif mark >= 85: print('Your grade is : A') elif mark >= 80: print('Your grade is : B') elif mark >= 70: print('Your grade is : C') elif mark >= 60: print('Your grade is : D') else: print('Failed! Your grade is : F') Please, enter your score: 80 Your grade is : B The Complete Python Programming Course: (Beginner to Advanced) If we use if instead of elif keywords; our program would not work properly In [4]: mark = float(input("Please, enter your score: ")) if mark >= 90: print('Your grade is : A+') if mark >= 85: print('Your grade is : A') if mark >= 80: print('Your grade is : B') if mark >= 70: print('Your grade is : C') if mark >= 60: print('Your grade is : D') else: print('Failed! Your grade is : F') Please, enter Your grade is Your grade is Your grade is your score: 80 : B : C : D In [ ]: The Complete Python Programming Course: (Beginner to Advanced) ... score: ")) if mark >= 90: print('Your grade is : A+') elif mark >= 85: print('Your grade is : A') elif mark >= 80: print('Your grade is : B') elif mark >= 70: print('Your grade is : C') elif mark... number: ")) if choice == '1': print(num1,"+",num2,"=", num1+num2) elif choice == '2': print(num1,"-",num2,"=", num1-num2) elif choice == '3': print(num1,"*",num2,"=", num1*num2) elif choice ==... is : D') else: print('Failed! Your grade is : F') Please, enter your score: 80 Your grade is : B The Complete Python Programming Course: (Beginner to Advanced) If we use if instead of elif keywords;