Python 语言中，以下表达式输出结果为11的选项是（ ）。 A: print("1+1") B: print(eval("1+1")) C: print(eval("1" + "1")) D: print(1+1)

以下类方法定义正确的是（） A: class Student: fav=("唱歌","跳舞","绘画") def showFav(cls): for item in cls.fav: print(item) B: class Student: fav=("唱歌","跳舞","绘画") @classmethod def showFav(cls): for item in fav: print(item) C: class Student: fav=("唱歌","跳舞","绘画") @classmethod def showFav(cls): for item in cls.fav: print(item) D: class Student: fav=("唱歌","跳舞","绘画") @classmethod def showFav(): for item in fav: print(item)

以下哪个Python程序能成功运行： A: a=int(input("请输入一个整数："))if a>0: print(a)else: print(-a) B: a=int(input("请输入一个整数："))if a>0:print(a)else:print(-a) C: a=int(input("请输入一个整数："))if a>0 print(a)else print(-a) D: a=int(input("请输入一个整数："))if a>0: print(a)else a<0: print(-a)

程序执行时输入12和34，结果如下所示，那么print（）函数正确的调用形式是（ ）请输入x:12请输入y:34x= 12 y= 34 A: print("x=",x ; "y=",y) B: print("x=",x,"y=",y) C: print(x,y) D: print(x=,x,y=,y)

下面说法正确的是（ ）。知识点：列表->字符串 A: time = [23,59,59]print(":".join(time))的输出结果是23:59:59 B: time = ['23','59','59']print(":".join(time))的输出结果是23:59:59 C: time = ['23','59','59']t_str = ""for t in time: t_str += t+":"print(t_str)程序输出结果是23:59:59 D: time = [23,59,59]t_str = ""for i in range(len(time)): if i<len(time)-1: t_str += str(time[i])+":" else: t_str += str(time[i])print(t_str)程序输出结果是23:59:59