Python编程：从入门到实践的动手试一试答案（第五章）

#5-1 条件测试car = 'subaru'print("Is car == 'subaru'? I predict True.")if car == 'subaru':    print(car == 'subaru')

#5-2 更多的条件测试略

#5-3 外星人颜色#1alien_color = ['green']if 'green' in alien_color:    print('恭喜你获得了5个点')print('版本2')alien_color = ['red']if 'green' in alien_color:    print('恭喜你获得了5个点')

#5-4 外星人颜色#2alien_color = ['green']if 'green' in alien_color:    print('恭喜你获得了5个点')else:    print('恭喜你获得10个点')print('版本2')alien_color = ['red']if 'green' in alien_color:    print('恭喜你获得了5个点')else:    print('恭喜你获得10个点')

#5-5 外星人颜色#3alien_color = ['green']if 'green' in alien_color:    print('恭喜你获得了5个点')elif 'yellow' in alien_color:    print('恭喜你获得10个点')else:    print('恭喜你获得15个点')print('版本2')alien_color = ['red']if 'green' in alien_color:    print('恭喜你获得了5个点')elif 'yellow' in alien_color:    print('恭喜你获得10个点')else:    print('恭喜你获得15个点')print('版本3')alien_color = ['yellow']if 'green' in alien_color:    print('恭喜你获得了5个点')elif 'yellow' in alien_color:    print('恭喜你获得10个点')else:    print('恭喜你获得15个点')

#5-6 人生的不同阶段age = 10if age < 2:    print("婴儿")elif age < 4:    print('蹒跚学步')elif age < 13:    print('儿童')elif age < 20:    print('青少年')elif age < 65:    print('成年人')else:    print('老年人')

#5-7 喜欢的水果 略

#5-8 以特殊方式跟管理员打招呼names = ['ergou','tiezhu','shitou','admin','erya']for name in names:    if name == 'admin':        print('Hello ' + name + ',would you like to see a status report?')    else:        print('Hello ' + name +',thank you for logging in again')

#5-9 处理没有用户的情形names = []if names:    for name in names:        if name == 'admin':            print('Hello ' + name + ',would you like to see a status report?')        else:            print('Hello ' + name +',thank you for logging in again')else:    print('We need to find some users!')

#5-10 检查用户名current_users = ['ergou','tiezhu','Shitou','admin','erya']new_users = ['Ergou','xiaofeng','shitou','shuanzi','dongzi']linshi = [] #临时储存全部小写的current_users里的元素#小写的current_users里的元素for name in current_users:        linshi.append(name.lower())for name in new_users:    if name.lower() in linshi:        print(name + '已被使用，请输入别的用户名！')    else:        print('该用户名未被使用！')

#5-11 序数numbers = list(range(1,10))print (numbers)for number in numbers:    if number == 1:        print(str(number)+'st')    elif number == 2:        print(str(number)+'nd')    elif number == 3:        print(str(number)+'rd')    else:        print(str(number)+'th')