用BeautifulSoup和Python語法選擇，輸入和解析？

Question

我是BeautifulSoup和python開發人員的全新手，我想爲我的個人網站自動化一些代碼。

我有這樣的：

#!/usr/bin/env python 

""" Test menu for Website 
""" 

import urllib2 
from bs4 import BeautifulSoup 

print (47 * '-') 
print (" C H O I C E L I S T") 
print (47 * '-') 
print ("1. Page One") 
print ("2. Page Two") 
print ("3. Page Three") 
print ("4. Page Four") 
print (47 * '-') 
print (47 * '-') 

############################# 
## Robust error handling ## 
## only accpet int  ## 
############################# 
## Wait for valid input in while...not ### 

is_valid=0 

while not is_valid : 
     try : 
       choice = int (raw_input('Enter your choice [1-8] : ')) 
       is_valid = 1 ## set it to 1 to validate input and to terminate the while..not loop 
     except ValueError, e : 
       print ("'%s' is not a valid choice." % e.args[0].split(": ")[1]) 


### Take action as per selected choice list option ### 

if choice == 1: 
     print ("www.mywebsite.com/page_one.html") 
elif choice == 2: 
     print ("www.mywebsite.com/page_two.html") 
elif choice == 3: 
     print ("www.mywebsite.com/page_three.html") 
elif choice == 4: 
     print ("www.mywebsite.com/page_four.html") 
else: 
     print ("Invalid choice. try again...") 

print (47 * '-') 
print (47 * '-') 


username = raw_input("Please, type your username\n") 


html_content = urllib2.urlopen("http://" + [choice] + "/" + username) 

soup = BeautifulSoup(html_content, "lxml") 

##################### 
## STRINGS REPLACE ## 
##################### 

start_msg = "Hey, you have " 
end_msg = "comments !" 
end_str = "read !" 


#################### 
## COMMENTS COUNT ## 
#################### 

count_comments = soup.find("span", "sidebar-comments") 
count_comments 
count_comments_final = count_comments.find_next("meta") 


################ 
## COUNT READ ## 
################ 

count_read = soup.find("span", "sidebar-read") 
count_read 
count_read_final = count_read.find_next("meta") 



################## 
## PRINT RESULT ## 
################## 

print start_msg + count_comments_final['content'].split(':')[1] + end_msg 
print start_msg + count_read_final['content'].split(':')[1] + end_str 

有了這個劇本，我想：

1 - 選擇我的網頁上（選擇列表 - 4）

2 - 輸入自己的用戶名

3 - 解析我選擇的網頁，並獲得所有評論和所有閱讀的計數。

我的問題是這裏html_content = urllib2.urlopen("http://" + [choice] + username)，我無法檢索一個好的URL所需的參數！

請幫我找到正確的語法！

我最後的URL應該是：http://www.mywebsite.com/page_one.html/username

Answer 1

這是一個奇怪的URL有，但你需要的唯一的事情就是網址存儲在變量和重用。

而且，我會用一個字典映射一個int的選擇和實際的URL：

mapping = { 
    1: 'www.mywebsite.com/page_one.html', 
    2: 'www.mywebsite.com/page_two.html', 
    3: 'www.mywebsite.com/page_three.html', 
    4: 'www.mywebsite.com/page_four.html' 
} 

try: 
    page = mapping[choice] 
except KeyError: 
    print ("Invalid choice. try again...") 
    # TODO: try again? :) 

username = raw_input("Please, type your username\n") 

url = "http://{page}/{username}".format(page=page, username=username) 
html_content = urllib2.urlopen(url)