di是一个字典类型的变量,以下不能打印出字典di中的键值的是。
A: for x,y in di.items(): print(x)
B: for x in di.keys(): print(x)
C: for x in di: print(di[x])
D: for x in di: print(x)
A: for x,y in di.items(): print(x)
B: for x in di.keys(): print(x)
C: for x in di: print(di[x])
D: for x in di: print(x)
举一反三
- 设解释I如下:DI是实数集,DI中特定元素a=0,DI中特定函数f(x,y)=x-y,特定谓词F(x,y)为x<y.在解释I下,下列哪些公式为真,哪些为假?(1)xF(f(a,x),a);(2)xy(¬F(f(x,y),x));(3)xyz(F(x,y)→F(f(x,z),f(y,z)));(4)xyF(x,f(f(x,y),y)).
- x为100,输出变量x的值,以下正确的是 A: print("x="+x) B: print("x=",x) C: print("x=".format(x)) D: print('x=x')
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- 修剪命令的快捷键是( )。 A: ex B: tr C: di D: x
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