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Python基礎練習100題 ( 41~ 50）

mochixuan / 1893人閱讀

摘要：刷題繼續(xù)大家好，我又回來了，昨天和大家分享了題，今天繼續(xù)來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，可以點擊以下鏈接下載題

刷題繼續(xù)

大家好，我又回來了，昨天和大家分享了31-40題，今天繼續(xù)來看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].
解法一 
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].
解法一 
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).
解法一 
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).
解法一 
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.
解法一 
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.
解法一 
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.
解法一 
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.
解法一 
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.
解法一 
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.
解法一 
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，可以點擊以下鏈接下載：

Python 41-50題

我的運行環(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：

raw_input()在Python3中是input()

print需要加括號

fstring可以換成.format(),或者%s，%d

謝謝大家，我們下期見！希望各位朋友不要吝嗇，把每道題的更高效的解法寫在評論里，我們一起進步！！！

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