苍穹外卖

1

Define a class named Circle which can be constructed by a radius. The Circle class has a method which can compute the area.

分析：考察构造函数和类方法

class Circle(object):
    def __init__(self,r):
        self.radius=r
    def area(self):
        return self.radius*self.radius
c=Circle(4)
print(c.area())

2

Define a class named American and its subclass NewYorker.

class American(object):
    def __init__(self):
        pass
class NewYorker (American):
    def __init__(self):
        American.__init__(self)

3

Define a class named American which has a static method called printNationality.

class American(object):
    def __init__(self):
        pass
    @staticmethod
    def printNationality(Nationality):
        print(Nationality)

4

Write a program which can map() to make a list whose elements are square of numbers between 1 and 20 (both included).

分析：lambda函数的用法

s = map(lambda x: x**2, range(1,21))
print (list(s))

5

Write a program which can filter() to make a list whose elements are even number between 1 and 20 (both included).

l = filter(lambda x: x%2==0,range(1,21))
print(list(l))

6

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].

li = [1,2,3,4,5,6,7,8,9,10]
evenNumbers = map(lambda x: x**2, filter(lambda x: x%2==0, li))
print (list(evenNumbers))

7

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].

li = [1,2,3,4,5,6,7,8,9,10]
l =map(lambda x:x**2,li)
print(list(l))

8

Write a program which can filter even numbers in a list by using filter function. The list is: [1,2,3,4,5,6,7,8,9,10].

li = [1,2,3,4,5,6,7,8,9,10]
l = filter(lambda x: x%2==0,li)
print(list(l))

9

Write a program which accepts a string as input to print “Yes” if the string is “yes” or “YES” or “Yes”, otherwise print “No”.

s =input("Please input:")
if (s=="yes" or s=="YES"or s=="Yes"):
    print("Yes")
else:
    print("No")

10

Write a program to generate and print another tuple whose values are even numbers in the given tuple (1,2,3,4,5,6,7,8,9,10).

分析：考察元组

t =(1,2,3,4,5,6,7,8,9,10)
l = []
for i in t:
    if(i%2==0):
        l.append(i)
t1=tuple(l)
print(t1)

11

With a given tuple (1,2,3,4,5,6,7,8,9,10), write a program to print the first half values in one line and the last half values in one line.

分析：[a : b : c]表示从a到b步长为c取元素

tp=(1,2,3,4,5,6,7,8,9,10)
tp1=tp[:5]
tp2=tp[5:]
print (tp1)
print (tp2)

12

Define a function which can generate and print a tuple where the value are square of numbers between 1 and 20 (both included).

分析：考察元组

def printTuple():
    li=list()
    for i in range(1,21):
        li.append(i**2)
    print (tuple(li))
printTuple()

13

Define a function which can generate a list where the values are square of numbers between 1 and 20 (both included). Then the function needs to print all values except the first 5 elements in the list.

def printList():
    li=list()
    for i in range(1,21):
        li.append(i**2)
    print (li[:5])
printList()

14

Define a function which can generate a list where the values are square of numbers between 1 and 20 (both included). Then the function needs to print the last 5 elements in the list.

分析：考察列表

def printList():
    li=list()
    for i in range(1,21):
        li.append(i**2)
    print (li[-5:])
printList()

15

Define a function which can generate a list where the values are square of numbers between 1 and 20 (both included). Then the function needs to print the first 5 elements in the list.

def printList():
    li=list()
    for i in range(1,21):
        li.append(i**2)
    print (li[:5])
printList()

16

Define a function which can generate and print a list where the values are square of numbers between 1 and 20 (both included).

def printList():
    li=list()
    for i in range(1,21):
        li.append(i**2)
    print (li)
printList()

17

Define a function which can generate a dictionary where the keys are numbers between 1 and 20 (both included) and the values are square of keys. The function should just print the keys only.

分析：考察字典

def printDict():
    d=dict()
    for i in range(1,21):
        d[i]=i**2
    for k in d.keys():
        print (k,end=" ")
printDict()

18

Define a function which can generate a dictionary where the keys are numbers between 1 and 20 (both included) and the values are square of keys. The function should just print the values only.

def printDict():
    d=dict()
    for i in range(1,21):
        d[i]=i**2
    for v in d.values():
        print (v,end=" ")
printDict()

19

Define a function which can print a dictionary where the keys are numbers between 1 and 20 (both included) and the values are square of keys.

def printDict():
    d=dict()
    for i in range(1,21):
        d[i]=i**2
    print (d)
printDict()

20

Define a function which can print a dictionary where the keys are numbers between 1 and 3 (both included) and the values are square of keys.

def printDict():
    d=dict()
    for i in range(1,4):
        d[i]=i**2
    print (d)
printDict()

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