Requesting and downloading dynamic website pages

In case of websites having forms or receiving user inputs, we have to submit a GET request or a POST request. Now let's try creating GET requests and post request with Python. The query string is the method for adding key-value pairs to a URL.

Escaping invalid characters

In the previous recipe, what will happen if we remove the try catch block in the last step?

patten = '(http)?s?:?(\/\/[^"]*\.(?:png|jpg|jpeg|gif|png|svg))' 
for line in open('packtpub.txt'): 
    for m in re.findall(patten, line):          
        fileName = basename(urlsplit(m[1])[2])                
        img = urllib2.urlopen('https:' + m[1]).read() 
        file...