题目内容

给定字典d,以下选项对d.get(x,y) 描述正确的是()

A. 返回字典d中键值对为x:y的值
B. 返回字典d中键为x值,如果不存在则返回y
C. 返回字典d中键为x值,如果不存在则返回空
D. 返回字典d中键为x值,如果不存在则报错

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s="The python language is a cross platform language."print(s.find("language",30))

A. 11
B. 40
C. 10
D. 系统出错

下面代码的输出结果是()a=[9,6,4,5]n=len(a)for i in range(int(n/2)):a[i],a[n-i-1]=a[n-i-1],a[i]print(a)

A. [9,6,4,5]
B. [5,6,9,4]
C. [5,4,6,9]
D. [9,4,6,5]

以下代码输出结果是()lst1=[i*2 for i in "Python"]print(lst1)

A. ["Python","Python"]
B. ["PP","yy","tt","hh","oo","nn"]
C. "Python","Python"
D. "PP","yy","tt","hh","oo","nn"

下列代码的输出结果是:()a=[]for i in range(2,10):count=0for x in range(2,i-1):if i % x == 0:count=count+1if count!=0:a.append(i)print(a)

A. [3,5,7,9]
B. [4,6,8,9,10]
C. [2,3,5,7]
D. [4,6,8,9]

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