Google App Engine and Your First Webapp

That's all you need to know

Search Engine, Phase I: Collecting links in a seed page

1:  #A program to gather links present in a webpage and to print them.  
2:  import urllib2  
3:  pos=0  
4:  contents=0  
5:  website_1=raw_input("Enter the website")  
6:  def web_contents(website):  
7:       global contents #really important stuff.   
8:       web_page=urllib2.urlopen(website)  
9:       contents=web_page.read()  
10:       return contents # ican't call contents outside the function, i can only  
11:               #calll the function defined  
12:  web_contents(website_1)  
13:  #print contents #to access a variable outside function it should be global  
14:  #global means it should be declared before any function definition(line no:5)  
15:  #A global variable created should be edited only by using the global keyword  
16:  #http://stackoverflow.com/questions/423379/using-global-variables-in-a-function-other-than-the-one-that-created-them  
17:  def parse_contents(contents,pos):  
18:       i=0  
19:       null_pos=contents.find("<a href=")  
20:       start_pos=contents.find("http",null_pos)  
21:       end_pos=contents.find('"',start_pos)  
22:       url_to_be_passed=contents[start_pos:end_pos]  
23:       #return url_to_be_passed,end_pos  
24:       links=[]  
25:       links.append(url_to_be_passed)  
26:       #return links  
27:       url_to=[]  
28:       while start_pos!=-1:  
29:            null_pos=contents.find("<a href=",end_pos)  
30:            #print null_pos  
31:            start_pos=contents.find("http",null_pos)  
32:            #print start_pos  
33:            end_pos=contents.find('"',start_pos)  
34:            #print end_pos  
35:            #print contents[1071:1091]  
36:            url_to.append(contents[start_pos:end_pos])  
37:            #print url_to  
38:            #links.append(url_to_b_passed)  
39:            #return url_to_be_passed,end_pos  
40:            #i=i+1  
41:            #links.append(url_to)  
42:            i=i+1  
43:       links=links+url_to  
44:       for each in links:  
45:            print each  
46:  parse_contents(contents,pos)  
47:  #def extract_links(url_to_be_passed):  
48:  #     list=[]  
49:  #     list.append(url_to_be_passed)  

The Zen of Python

Hi,

This will be my first post on this blog. And i want to start with an easter egg present in  Python interpreter.


Type this into the interpreter..

$ import this

The Zen of Python, by Tim Peters

"Beautiful is better than ugly.
Explicit is better than implicit.
Simple is better than complex.
Complex is better than complicated.
Flat is better than nested.
Sparse is better than dense.
Readability counts.
Special cases aren't special enough to break the rules.
Although practicality beats purity.
Errors should never pass silently.
Unless explicitly silenced.
In the face of ambiguity, refuse the temptation to guess.
There should be one-- and preferably only one --obvious way to do it.
Although that way may not be obvious at first unless you're Dutch.
Now is better than never.
Although never is often better than *right* now.
If the implementation is hard to explain, it's a bad idea.
If the implementation is easy to explain, it may be a good idea.
Namespaces are one honking great idea -- let's do more of those! "





That is python philosophy explained in the most ambiguous and concise manner. It might take years of programming experience for me to properly understand what Tim Peters have tried to convey through those lines. This is where i start , from the Zen of Python on my journey to charm this snake.