Python练习作业2

我什么都学不会2026-01-26 19:24

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# 1 D
x = list(range(9))
del x[:2]
print(x)

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# 2 B
print(len(range(1,10)))

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# 3 D
"""
A:生成新字符串
B:最后一个元素后没有逗号
C:最后一个元素后不会增加逗号
"""

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# 4 A
print([1,2,3] * 3)

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# 5 B
aList = [3,4,5,6,7,9,11,13,15,17]
print(aList[3:7])

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# 6 D
x = list(range(20))
print(x[-1])

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# 7 D
print(list(range(6))[::2])

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# 8 C
x=[3,7,5]
x=x.sort(reverse=True)
print(x)

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# 9 D
txt=["a","b","c","d","e"]
stop_words=["d","i"]
t=[x for x in txt if x not in stop_words]
print(t)

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# 10 C
ls=["abcd","ab","cd","cdab"]
n,m=0,0
for line in ls:
     if "ab" and "cd" in line:
          n+=1
          m+=1
     elif "ab" in line:
          n+=1
     elif "cd" in line:
          m+=1
print (n,m)

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# 11 A
ls=[11,22,33,44]
for i in ls:
     if i=="33":
        print("找到！i=",i)
        break
else:
      print("未找到...")

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# 12 C
k=0
for i in range (4):
     for j in range(i+1):
          k+=j
          if j>1:
               break
print(k)

测试结果：