Python基礎練習100題 ( 61~ 70）

jeyhan 發布于2019-07-31 10:31 / 2397人閱讀

摘要：刷題繼續昨天和大家分享了題，今天繼續來刷題解法一解法一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解法二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果，可以點擊以下鏈接下載題

刷題繼續

昨天和大家分享了51-60題，今天繼續來刷61~70題

Question 61:

The Fibonacci Sequence is computed based on the following formula:

f(n)=0 if n=0
f(n)=1 if n=1
f(n)=f(n-1)+f(n-2) if n>1

Please write a program to compute the value of f(n) with a given n input by console.

*Example:
If the following n is given as input to the program:*

Then, the output of the program should be:

解法一

def f(n):
    if n < 2:
        return n
    return f(n-1) + f(n-2)

n = int(input())
print(f(n))

Question 62:

The Fibonacci Sequence is computed based on the following formula:

f(n)=0 if n=0
f(n)=1 if n=1
f(n)=f(n-1)+f(n-2) if n>1

Please write a program to compute the value of f(n) with a given n input by console.

*Example:
If the following n is given as input to the program:*

Then, the output of the program should be:

0,1,1,2,3,5,8,13

解法一

def f(n):
    if n < 2:
        fibo[n] = n
        return fibo[n]
    fibo[n] = f(n-1) + f(n-2)
    return fibo[n]

n = int(input())
fibo = [0]*(n+1)  # initialize a list of size (n+1)
f(n)            
fibo = [str(i) for i in fibo]   
ans = ",".join(fibo)    
print(ans)

Question 63:

Please write a program using generator to print the even numbers between 0 and n in comma separated form while n is input by console.

*Example:
If the following n is given as input to the program:*

Then, the output of the program should be:

0,2,4,6,8,10

In case of input data being supplied to the question, it should be assumed to be a console input.

解法一

def get_evennumbers(x):
    for x in range(0,x+1):
        if x%2==0:
            yield x

input_number=int(input())
values = []
for i in get_evennumbers(input_number):
    values.append(str(i)) 
print(",".join(values))

Question 64:

Please write a program using generator to print the numbers which can be divisible by 5 and 7 between 0 and n in comma separated form while n is input by console.

*Example:
If the following n is given as input to the program:*

Then, the output of the program should be:

0,35,70

解法一

def devision_seven_five(x):
    for x in range(0,x+1):
        if x%35==0:
            yield x

input_number=int(input())
values = []
resp = [str(i) for i in devision_seven_five(input_number)]
print(",".join(resp))

Question 65:

Please write assert statements to verify that every number in the list [2,4,6,8] is even.

解法一

data = [2,4,5,6]
for i in data:
    assert i%2 == 0, "{} is not an even number".format(i)

Question 66:

Please write a program which accepts basic mathematic expression from console and print the evaluation result.

*Example:
If the following n is given as input to the program:*

35 + 3

Then, the output of the program should be:

解法一

expression = input()
ans = eval(expression)
print(ans)

Question 67:

Please write a binary search function which searches an item in a sorted list. The function should return the index of element to be searched in the list.

解法一

from bisect import bisect_right 

def BinarySearch(a, x): 
    i = bisect_right(a, x) 
    if i != len(a)+1 and a[i-1] == x: 
        return (i-1) 
    else: 
        return -1

lst = [1,2,4,5,6,7,8] 
x = int(input()) 
res = BinarySearch(lst, x) 
if res == -1: 
    print(x, "is absent") 
else: 
    print("Last occurrence of", x, "is present at", res)

Question 68:

Please generate a random float where the value is between 10 and 100 using Python module.

解法一

import random
rand_num = random.uniform(10,100)
print(rand_num)

解法二

import random
print(random.random()*100)

Question 69:

Please generate a random float where the value is between 5 and 95 using Python module.

解法一

  
import  random 
print(random.random()*100-5)

解法二

import  random  rand_num  =  random.uniform(5,95)  
print(rand_num)

Question 70:

Please write a program to output a random even number between 0 and 10 inclusive using random module and list comprehension.

解法一

import random
resp = [i for i in range(2,11,2)]
print(random.choice(resp))

解法二

import random
even_numbers = [x for x in range(0,11) if x%2==0]
print(random.choice(even_numbers))

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果，可以點擊以下鏈接下載：

Python 61-70題

我的運行環境Python 3.6+,如果你用的是Python 2.7版本，絕大多數不同就體現在以下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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