一、判断

1、条件判断

age = 18if age >= 18:    print('your are is', age)    print('adult')age = 3if age >= 18:    print('your are is', age)    print('adult')elif age >= 6:    print('your are is', age)    print('Sarah')elif age >= 3:    print('your are is', age)    print('Jack')else:    print('your are is', age)    print('mike')# 注意:# input()返回的是字符串# 必须通过int()将字符串转换为整数# 才能用于数值比较:age = int(input('Input your age:'))if age >= 18:    print('your are is', age)    print('adult')elif age >= 6:    print('your are is', age)    print('Sarah')elif age >= 5:    print('your are is', age)    print('Jack')else:    print('your are is', age)    print('mike')