PythonPython30个笔试题
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Python测试题
1.求结果:( )
v = dict.fromkeys([‘k1’,‘k2’],[])
v[‘k1’].append(666)
print(v)
v[‘k1’] = 777
print(v)
A.“K1”:[666],“K2”:[666] “K1”:777,“K2”:666
B.“K1”:[666],“K2”:666 “K1”:777,“K2”:[666]
C.“K1”:666,“K2”:[666] “K1”:777,“K2”:[666]
D.“K1”:[666],“K2”:[666] “K1”:777,“K2”:[666]
答案: D
2.一下不是常见的内置函数?( )
A.map B.reduce C.filter D.mapreduce
答案: D
3.以下不能创建一个字典的语句是 ( )
A、dict1 =
B、dict2 = 3 : 5
C、dict3 = [1,2,3]: “uestc”
D、dict4 = (1,2,3): “uestc”
答案: C
4.df是一个DataFrame,下面用法不正确的是( )
A.df.apply(lambda x:x.sum(), axis=1)
B.df.applymap(abs)
C.df.rolling(10).apply(lambda x:x.rank())
D.df.applymap(np.log)
答案: B
5.下列哪个语句在Python中是非法的?( )
A、x = y = z = 1 B、x = (y = z + 1)
C、x, y = y, x D、x += y
答案: B
6、下列哪种说法是错误的 ( )
A、除字典类型外,所有标准对象均可以用于布尔测试
B、空字符串的布尔值是False
C、空列表对象的布尔值是False
D、值为0的任何数字对象的布尔值是False
答案: D
7、下列Python语句正确的是 ()
A、min = x if x < y else y
B、max = x > y ? x : y
C、if (x > y) print x
D、while True : pass
答案: D
8、函数如下:
def showNnumber(numbers):
for n in numbers:
print(n)
下面那些在调用函数时会报错( )
A showNumer([2,4,5]) B showNnumber(‘abcesf’)
C showNnumber(3.4) D showNumber((12,4,5))
答案: C
9、 函数如下
def chanageInt(number2):
number2 = number2+1
print("changeInt: number2= ",number2)
#调用
number1 = 2
chanageInt(number1)
print(“number:”,number1)
打印结果哪项是正确的( )
A changeInt: number2= 3
number: 3
B changeInt: number2= 3
number: 2
C number: 2
changeInt: number2= 2
D number: 2
changeInt: number2= 3
答案: B
10、class A:
Pass
可实现类A可迭代的函数是( )
A._new_
B._iter_
C._dict_
D._iterator_
答案: B
11、定义类如下:
class hello():
def showInfo(self):
print(self.x)
下面描述正确的是( )
A该类不可以实例化
B 该类可以实例化
C 在pycharm 工具中会出现语法错误,说self有定义
D 该类可以实例化,并且能正常通过对象调用showInfo()
答案: AC
12、定义类如下
class Hello():
def __init__(self,name)
self.name=name
def showInfo(self)
print(self.name)
下面代码能正常执行的 ( )
A h = Hello
h.showInfo()
B h = Hello()
h.showInfo(‘张三’)
C h = Hello(‘张三’)
h.showInfo()
D h = Hello(‘admin’)
showInfo
答案: C
13、
g = (xx for x in range(10)),L = [xx for x in range(10)]
正确的是( )
A.g==L
B.g[0]==L[0]
C.Type(g)==type(L)
D.Sum(g)==sum(L)
答案: D
14 下面定义函数正确的是:( )
A.def func(a,*args,b):pass
B.Def func(a,**kwargs):pass
C.Def func(a,**kwargs, *args, c):pass
D.Def func(a,b,*args, **kwargs):pass
答案: D
15、
a = [1,2,3,4,5,6,7]
b = filter(lambda x: x > 5, a)
print b
下面正确的是:( )
A.[6,7]
B.[7,6]
C.[5,7,6]
D.[5,6,7]
答案: A
16.reduce(lambda x,y:x*y,range(1,4))
下面正确的是( )
A.6
B.7
C.8
D.9
答案: A
17、
import copy
a = [1, 2, 3, 4, [‘a’, ‘b’]] #原始对象
b = copy.copy(a)
c = copy.deepcopy(a)
正确的是( )
A.id(a[1])!=id(b[1])
B.id(a[-1])==id(b[-1])
C.id(a[-1])==id(c[-1])
D.id(a[0])!=id(b[0])!=id(c[0])
答案: B
18. 导入模块的方式错误的是( )
A import mo B from mo import *
C import mo as m D import m from mo
答案: D
19、
A1 = ‘小明’:93,‘小红’:88,‘小刚’:100
A2 = ‘小刚’:100,‘小明’:93,‘小红’:88
print(A1 == A2)
下面正确的是:( )
A、A1 == A2
B、False
C、”False”
D、True
答案: D
20、
a = [1,2,3]
b = [4,5]
A.append(b)
下面正确的是( )
A.Len(a)==4
B.Len(a)==5
C.sum(a)==15
D.a[-1]==5
答案: A
21、
a = “601988-中国银行”
print(re.findall(“(\\d+)-([\\u4e00-\\u9fa5]+)”, a))
下面正确的是( )
A.[(‘601988’, ‘中国银行’)]
B.“‘601988’”
C.“中国银行”
D.(‘601988’, ‘中国银行’)
答案: A
22、
a = “a”:1, “b”:2, “c”:3
print(Max(a))
print(max(a), key=lambda x:a[x])
下面正确的是( )
A.”c” 和3
B.“c”和”c”
C.“3”和”3”
D.“3”和”c”
答案: C
23、
a = [(“a”, 3), (“b”, 2), (“d”, 0)]
sorted(a, key= lambda x:a[0])
下面正确的是( )
A.[(“a”, 3), (“b”, 2), (“d”, 0)]
B.[(“d”, 0), (“”b, 2), (“a”,3)]
C.[(“a”, 0), (“b”, 2), (“d”,3)]
D.[(“a”, 3), (“b”, 2), (“d”,0)]
答案: A
24、df是一个DataFrame,,均值填充NaN值( )
A.df.fillna(df.mean())
B.Df.fillna(method=”ffill”)
C.df.fillna(“mean”)
D.Df.fillna(np.mean)
答案: A
25、下面不能提高python性能的是( )
A.Map
B.Numpy
C.For
D.Cython
答案: C
26、
from collections import defaultdict, OrderedDict
a = defaultdict(OrderedDict)
def func(code, i):
a[code][i] = i
def timer():
while 300000!=sum(map(lambda code: len(a[code]), a.keys())):
print(sum(map(lambda code: len(a[code]), a.keys())))
time.sleep(1)
print("ending")
t0 = Thread(target=timer)
t0.start()
ts = []
for code in ["a", "b", "c"]:
for i in range(100000):
t = Thread(target=func, args=(code, i, ))
ts.append(t)
t.start()
for t in ts:
t.join()
print(sum([set(a[k].keys())!=set(a[k].values()) for k in a]))
下面正确的是( )
A.0
B.100000
C.99999
D.4999950000
答案: ?
27.print(0 or False and 1)
下面正确的是( )
A.False
B.0
C.1
D.True
答案: A
28、
from collections import deque
queue = deque(['Eric', 'John', 'Michael'])
queue.append('Terry')
queue.append('Graham')
print(queue)
queue.popleft()
print(queue)
下面正确的是( )
A.deque([‘Eric’, ‘John’, ‘Michael’, ‘Terry’, ‘Graham’])
deque([‘John’, ‘Michael’, ‘Terry’, ‘Graham’])
B.[‘Eric’, ‘John’, ‘Michael’, ‘Terry’, ‘Graham’]
[‘John’, ‘Michael’, ‘Terry’, ‘Graham’]
C.deque([‘Eric’, ‘John’, ‘Michael’, ‘Terry’, ‘Graham’])
[‘John’, ‘Michael’, ‘Terry’, ‘Graham’]
D.[‘Eric’, ‘John’, ‘Michael’, ‘Terry’, ‘Graham’]
deque([‘John’, ‘Michael’, ‘Terry’, ‘Graham’])
答案: A
29、
df1, df2都是DataFrame
df1,df2=df1.align(df2, join=‘inner’)
下面正确的是( )
A.df1.columnsdf2.columns and df1.indexdf2.index
B.df1.columns!=df2.columns and df1.index!=df2.index
C.df1.columns!=df2.columns and df1.indexdf2.index
D.df1.columnsdf2.columns and df1.index!=df2.index
答案: A
30、
def mul(x):
return x*x
n=[1,2,3,4,5]
res=list(map(mul,n))
print(res)
下面正确的是( )
A.[1, 4, 9, 16, 25]
B.[1,2,3,4,5]
C.<map at 0x25d57825400>]
D.[1,4,3,4,25]
答案: A
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