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摘要：刷題繼續(xù)大家好，我又回來(lái)了，昨天和大家分享了題，今天繼續(xù)來(lái)看題解法一解法二解法一解法二解法一解法二解法一解法二解法一解法一解法一解法一解法一解法一源代碼下載這十道題的代碼在我的上，如果大家想看一下每道題的輸出結(jié)果，可以點(diǎn)擊以下鏈接下載題
刷題繼續(xù)
大家好，我又回來(lái)了，昨天和大家分享了31-40題，今天繼續(xù)來(lái)看41~50題
Question 41:Write a program which can map() to make a list whose elements are square of elements in [1,2,3,4,5,6,7,8,9,10].
lst=[i for i in range(1,11)] lst_square = list(map(lambda x:x*x,lst)) print(lst_square)解法二
li = [1,2,3,4,5,6,7,8,9,10] squaredNumbers = map(lambda x: x**2, li) print(list(squaredNumbers))Question 42:
Write a program which can map() and filter() to make a list whose elements are square of even number in [1,2,3,4,5,6,7,8,9,10].
lst=[i for i in range(1,11)] even_numbers = list(map(lambda x: x**2, filter(lambda x: x%2==0, lst))) print(even_numbers)解法二
def even(x):
return x%2==0
def squer(x):
return x*x
li = [1,2,3,4,5,6,7,8,9,10]
li = map(squer,filter(even,li))
print(list(li))
Question 43:
Write a program which can filter() to make a list whose elements are even number between 1 and 20 (both included).
even_numbers = list(filter(lambda x: x%2==0, range(1,21))) print(even_numbers)解法二
def even(x):
return x%2==0
evenNumbers = filter(even, range(1,21))
print(list(evenNumbers))
Question 44:
Write a program which can map() to make a list whose elements are square of numbers between 1 and 20 (both included).
def sqr(x):
return x*x
squaredNumbers = list(map(sqr, range(1,21)))
print (squaredNumbers)
解法二
squaredNumbers = list(map(lambda x: x**2, range(1,21))) print(squaredNumbers)Question 45:
Define a class named American which has a static method called printNationality.
class American():
@staticmethod
def printNationality():
print("I am American")
american = American()
american.printNationality() # this will not run if @staticmethod does not decorates the function.Because the class has no instance.
American.printNationality() # this will run even though the @staticmethod does not decorate printNationality()
Question 46:
Define a class named American and its subclass NewYorker.
class American():
pass
class NewYorker(American):
pass
american = American()
newyorker = NewYorker()
print(american)
print(newyorker)
Question 47:
Define a class named Circle which can be constructed by a radius. The Circle class has a method which can compute the area.
class Circle:
def __init__(self,radius):
self.radius = radius
def area(self):
return (self.radius**2*3.14)
# Test
circle = Circle(5)
print(circle.area())
Question 48:
Define a class named Rectangle which can be constructed by a length and width. The Rectangle class has a method which can compute the area.
class Rectangle():
def __init__(self,l,w):
self.length = l
self.width = w
def area(self):
return self.length*self.width
rect = Rectangle(2,4)
print(rect.area())
Question 49:
Define a class named Shape and its subclass Square. The Square class has an init function which takes a length as argument. Both classes have a area function which can print the area of the shape where Shape"s area is 0 by default.
class Shape():
def __init__(self):
pass
def area(self):
return 0
class Square(Shape):
def __init__(self,length = 0):
Shape.__init__(self)
self.length = length
def area(self):
return self.length*self.length
Asqr = Square(5)
print(Asqr.area()) # prints 25
print(Square().area()) # prints à
Question 50:
Please raise a RuntimeError exception.
raise RuntimeError("something wrong")
源代碼下載
這十道題的代碼在我的github上，如果大家想看一下每道題的輸出結(jié)果，可以點(diǎn)擊以下鏈接下載：
Python 41-50題
我的運(yùn)行環(huán)境Python 3.6+,如果你用的是Python 2.7版本，絕大多數(shù)不同就體現(xiàn)在以下3點(diǎn)：
raw_input()在Python3中是input()
print需要加括號(hào)
fstring可以換成.format(),或者%s，%d
謝謝大家，我們下期見(jiàn)！希望各位朋友不要吝嗇，把每道題的更高效的解法寫在評(píng)論里，我們一起進(jìn)步！！！
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