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:*
5
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:
5
Then, the output of the program should be:
501
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:
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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