Python基础练习100题 ( 61~ 70）

jeyhan 发布于2019-07-31 10:31 / 2370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

昨天和大家分享了51-60题，今天继续来刷61~70题

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 61-70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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