We have a page that redirects to another page. How to figure out where the redirection points to?
import urllib s = "https://pythonadventures.wordpress.com?random" # returns a random post page = urllib.urlopen(s) print page.geturl() # e.g. http:// pythonadventures.wordpress.com/2010/10/08/python-challenge-1/
I found it in this thread.
>>> import requests >>> r = requests.get('https://pythonadventures.wordpress.com?random') >>> r.url u'https://pythonadventures.wordpress.com/2010/09/30/create-import-module/'
Here is a mini cheat sheet for reading and writing a text file.
Read a text file line by line and write each line to another file (copy):
f1 = open('./in.txt', 'r') to = open('./out.txt', 'w') for line in f1: to.write(line) f1.close() to.close()
text = f.read() # read the entire file line = f.readline() # read one line at a time lineList = f.readlines() # read the entire file as a list of lines
I had the following unicode string: “Kellemes Ünnepeket!” that I wanted to simplify to this: “Kellemes Unnepeket!”, that is strip “Ü” to “U”. Furthermore, most of the strings were normal ascii, only some of them were in unicode.
import unicodedata title = ... # get the string somehow try: # if the title is a unicode string, normalize it title = unicodedata.normalize('NFKD', title).encode('ascii','ignore') except TypeError: # if it was not a unicode string => OK, do nothing pass
I used the following resources:
You want to interact with a MySQL database from your Python script.
First of all, you need to install the following package:
sudo apt-get install python-mysqldb
Then try the following basic script to check if everything is OK:
#!/usr/bin/env python import MySQLdb conn = MySQLdb.connect (host = "localhost", user = "testuser", passwd = "testpass", db = "test") cursor = conn.cursor () cursor.execute ("SELECT VERSION()") row = cursor.fetchone () print "server version: ", row cursor.close () conn.close ()
We have a .csv file with two columns: symbol and name. Iterate through the lines and insert each line in a database table as a record.
#!/usr/bin/env python import MySQLdb f1 = open('./NYSE.csv', 'r') # A line looks like this: # ZLC; Zale Corporation conn = MySQLdb.connect(host = "localhost", user = "user", passwd = "passwd", db = "table") cursor = conn.cursor() for line in f1: pieces = map(str.strip, line.split(';')) #print "'%s' => '%s'" % (pieces, pieces) query = "INSERT INTO symbol_name (symbol, name) VALUES (\"%s\", \"%s\")" % (pieces, pieces) #print query cursor.execute(query) f1.close() conn.commit() cursor.close () conn.close ()
There are lots of Python-MySQL tutorials on the net. Let’s see some of them: