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Python基礎(chǔ)練習(xí)100題 ( 31~ 40）

miracledan / 2189人閱讀

摘要：刷題繼續(xù)昨天和大家分享了題，今天繼續(xù)來(lái)刷題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)擊以下鏈接下載題我的運(yùn)行環(huán)境如果你

刷題繼續(xù)

昨天和大家分享了21-30題，今天繼續(xù)來(lái)刷31~40題

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 31-40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！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！?。?/p>

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