Python基础练习100题 ( 51~ 60）

岳光发布于2019-07-31 10:31 / 1882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二解法一解法二解法一解法二解法三解法一解法一解法一解法一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

刷题继续

昨天和大家分享了41-50题，今天继续来刷51~60题

Question 51:

Write a function to compute 5/0 and use try/except to catch the exceptions.

解法一

def divide():
    return 5/0

try:
    divide()
except ZeroDivisionError as ze:
    print("Why you are dividing a number by ZERO!!")
except:
    print("Any other exception")

Question 52:

Define a custom exception class which takes a string message as attribute.

解法一

class CustomException(Exception):
    """Exception raised for custom purpose
    Attributes:message -- explanation of the error
    """

    def __init__(self, message):
        self.message = message

num = int(input())
try:
    if num < 10:
        raise CustomException("Input is less than 10")
    elif num > 10:
        raise CustomException("Input is grater than 10")
except CustomException as ce:
    print("The error raised: " + ce.message)

Question 53:

Assuming that we have some email addresses in the "username@companyname.com" format, please write program to print the user name of a given email address. Both user names and company names are composed of letters only.

Example:
If the following email address is given as input to the
program:

john@google.com

Then, the output of the program should be:

john

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

解法一

def getname(s):
    try:
        return s.split("@")[0]
    except:
        print("This is not a email-adress")

getname("john@google.com")

解法二

import re

email = "john@google.com"
pattern = "(w+)@w+.com"
ans = re.findall(pattern,email)
print(ans)

Question 54:

Assuming that we have some email addresses in the "username@companyname.com" format, please write program to print the company name of a given email address. Both user names and company names are composed of letters only.

Example:
If the following email address is given as input to the program:

john@google.com

Then, the output of the program should be:

google

解法一

import re

email = "john@google.com"
pattern = "w+@(w+).com"
ans = re.findall(pattern,email)
print(ans)

解法二

def getname(s):
    try:
        return s.replace("@",".").split(".")[1]
    except:
        print("Something Wrong")

getname("john@google.com")

Question 55:

Write a program which accepts a sequence of words separated by whitespace as input to print the words composed of digits only.

Example:
If the following words is given as input to the program:

2 cats and 3 dogs.

Then, the output of the program should be:

["2", "3"]

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

解法一

import re
s = input()
print(re.findall("d+",s))

解法二

import re
s= input()
pattern = "d+"
ans = re.findall(pattern,s)
print(ans)

解法三

[int(s) for s in input().split() if s.isdigit()]

Question 56:

Print a unicode string "hello world".

解法一

unicodeString = u"hello world!"
print(unicodeString)

Question 57:

Write a program to read an ASCII string and to convert it to a unicode string encoded by utf-8.

解法一

s = input()
u = s.encode("utf-8")
print(u)

Question 58:

Write a special comment to indicate a Python source code file is in unicode.

解法一

# -*- coding: utf-8 -*-

Question 59:

Write a program to compute 1/2+2/3+3/4+...+n/n+1 with a given n input by console (n>0).

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

Then, the output of the program should be:

3.55

解法一

n = int(input())
sum = 0
for i in range(1, n+1):
    sum+= i/(i+1)
print(round(sum, 2))  # rounded to 2 decimal point

Question 60:

Write a program to compute:

f(n)=f(n-1)+100 when n>0
and f(0)=1

with a given n input by console (n>0).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 == 0:
        return 1
    else:
        return f(n-1) + 100

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

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 51-60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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