Python基础练习100题 ( 41~ 50）

mochixuan 发布于2019-07-31 10:31 / 1858人阅读

摘要：刷题继续大家好，我又回来了，昨天和大家分享了题，今天继续来看题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码下载这十道题的代码在我的上，如果大家想看一下每道题的输出结果，可以点击以下链接下载题

刷题继续

大家好，我又回来了，昨天和大家分享了31-40题，今天继续来看41~50题

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")

源代码下载

这十道题的代码在我的github上，如果大家想看一下每道题的输出结果，可以点击以下链接下载：

Python 41-50题

我的运行环境Python 3.6+,如果你用的是Python 2.7版本，绝大多数不同就体现在以下3点：

raw_input()在Python3中是input()

print需要加括号

fstring可以换成.format(),或者%s，%d

谢谢大家，我们下期见！希望各位朋友不要吝啬，把每道题的更高效的解法写在评论里，我们一起进步！！！

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