Python - 运算符和条件

a = 2b = 4result = (a > b)print(result)false

a = 2b = 4result = (a <= b)print(result)true

#andcondition_1 = truecondition_2 = trueprint(condition_1 and condition_2)truecondition_1 = truecondition_2 = falseprint(condition_1 and condition_2)false#orcondition_1 = truecondition_2 = falseprint(condition_1 or condition_2)true

#notcondition_1 = trueprint(not condition_1 )false

a = 25b = 25if a > b:    print("a is greater than b")elif a == b:    print("a is equal to b")else:    print("a is less than b")

a is equal to b

name = input("what is your name? ")print("hello, " + name + "!")print("have a nice day.")

age = input("enter your age: ")age = int(age)print("you are " + str(age) + " years old.")

age = int(input("enter your age: "))print("you are " + str(age) + " years old.")

num = float(input("enter a number: "))if num > 0 :   result = "positive"elif num < 0 :   result = "negative"else :   result = 0print(f"the number is {result}.")

if mark >= 91 and mark <= 100:    print("Grade A")elif mark >= 81 and mark < 91:    print("Grade B")elif mark >= 71 and mark < 81:    print("Grade C")elif mark >= 61 and mark < 71:    print("Grade D")elif mark >= 45 and mark < 61:    print("Grade E")elif mark < 45:    print("Fail")else:    print("Mark not valid")