Python基础练习100题 ( 31~ 40）

miracledan 发布于2019-07-31 10:31 / 1981人阅读

摘要：刷题继续昨天和大家分享了题，今天继续来刷题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解法二解法一解法二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我的运行环境如果你

刷题继续

昨天和大家分享了21-30题，今天继续来刷31~40题

Question 31:

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.

解法一

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

解法二

def printDict():
    dict={i:i**2 for i in range(1,21)}   
    print(dict)
printDict()

Question 32:

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.

解法一

def printDict():
    dict = {i: i**2 for i in range(1, 21)}
    print(dict.keys())      
printDict()

解法二

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

Question 33:

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

解法一

def printList():
    lst = [i ** 2 for i in range(1, 21)]
    print(lst)
printList()

Question 34:

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.

解法一

def printList():
    lst = [i ** 2 for i in range(1, 21)]
    print(lst[:5])

printList()

Question 35:

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.

解法一

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

Question 36:

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.

解法一

def printList():
    lst = [i ** 2 for i in range(1, 21)]
    print(lst[5:])
    
printList()

Question 37:

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

解法一

def printTuple():
    lst = [i ** 2 for i in range(1, 21)]
    print(tuple(lst))

printTuple()

Question 38:

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.

解法一

tpl = (1,2,3,4,5,6,7,8,9,10)

for i in range(0,5):
    print(tpl[i],end = " ")
print()
for i in range(5,10):
    print(tpl[i],end = " ")

解法二

tp = tuple(i for i in range(1,11))
lst1,lst2 = list(tp[:5]),list(tp[5:])
print(lst1)
print(lst2)

Question 39:

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).

解法一

tpl = (1,2,3,4,5,6,7,8,9,10)
tpl_even = tuple(i for i in tpl if i%2 == 0)
print(tpl_even)

解法二

tpl = (1,2,3,4,5,6,7,8,9,10)
tpl_even= tuple(filter(lambda x : x%2==0,tpl))  
print(tpl_even)

Question 40:

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

解法一

s = input()
if s.lower() == "yes": 
    print("Yes")
else:
    print("No")

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 31-40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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