Python FTPLIB Simple Example

#!/usr/bin/python
from ftplib import FTP
import sys

print "hello world"
site = 'ftp.example.com'
ftp = FTP(site)
print 'Logging in to '+site
print ftp.login('myname', 'passwd')
directory = '~/public_html/'
print 'Changing to ' + directory
print ftp.cwd(directory)
for myfile in sys.argv:
ftp.storbinary("STOR " + myfile, file(myfile, "rb"))
print ftp.retrlines('LIST')
print ftp.close()

MD5 Python

>>> import urllib, hashlib
>>> me = hashlib.md5('hello')
>>> print me
<md5 HASH object @ 0x10568d970>
>>> print me.hexdigest()
5d41402abc4b2a76b9719d911017c592

Python: Error Handling

import traceback
def formatExceptionInfo(maxTBlevel=5):
         cla, exc, trbk = sys.exc_info()
         excName = cla.__name__
         try:
             excArgs = exc.__dict__["args"]
         except KeyError:
             excArgs = ""
         excTb = traceback.format_tb(trbk, maxTBlevel)
         return (excName, excArgs, excTb)

try:
         x = x + 1
except:
         print formatExceptionInfo()

Python: Kill Self

import os
def properExit():
 os.system('kill %d' % os.getpid())

Print just the name of the running Python program

#!/usr/bin/env python
import sys
import os
for i in sys.argv:
        print i
print sys.argv[0]
print os.path.basename(sys.argv[0].split(".")[0])

#>bin/test.py 56 555
bin/test.py
56
555
bin/test.py
test

MySQL Connect in Python

#!/usr/bin/env python
import pymysql

conn = pymysql.connect(host='localhost', user='root', passwd='cyrushellborg666', db='brewing')
cur = conn.cursor()
cur.execute("SHOW TABLES")
# print cur.description
# r = cur.fetchall()
# print r
# ...or...
for r in cur:
   print r
cur.close()
conn.close()

Basic timer in Python

#!/usr/bin/env python


import time
import threading

class Timer(threading.Thread):
  def __init__(self, seconds):
   self.runTime = seconds
   threading.Thread.__init__(self)
  def run(self):
   time.sleep(self.runTime)
   print "Buzzzz!! Time's up!"

class CountDownTimer(Timer):
  def run(self):
   counter = self.runTime
   for sec in range(self.runTime):
    print counter
    time.sleep(1.0)
    counter -= 1
   print "Done."


class CountDownExec(CountDownTimer):   
  def __init__(self, seconds, action):  
   self.action = action    
   CountDownTimer.__init__(self, seconds) 
  def run(self):      
   CountDownTimer.run(self)   
   self.action()     
   
def myAction():      
  print "Performing my action..."   



c = CountDownExec(10, myAction)
c.start()

#>./timer.py 
10
9
8
7
6
5
4
3
2
1
Done.
Performing my action...

Pad and sort list of IP numbers

L = ['123.76.9.2', '125.76.9.3', '123.76.10.12', '92.93.3.79', '92.93.3.78', '222.222.222.222', '222.222.1.222']
L = sorted([".".join(['%03d' % int(j) for j in i.split('.')]) for i in L])
print L

In list of numbers, find each pair that equals 100

Yes I know this has no graceful error protection for user input, wanted the example code to focused on problem space.

#!/usr/bin/env python
import random
import sys
X=int(sys.argv[1]) # e.g. enter 100 on the command line
print "In list of numbers, find each pair that equals " + str(X)

myNumbers = []
matched = []
for i in range(1,X):
 myNumbers.append(random.randrange(0,X))

for i in myNumbers:
 A=myNumbers.pop()
 for j in myNumbers:
  if A != False:
   try:
    if ((A+myNumbers[j]) == X):
     B=myNumbers[j]
     del myNumbers[j]
     matched.append([A, B])
     A = False
   except:
    TypeError

for i, j  in enumerate(matched):
 if ((i>0) and (i % 5 == 0)):
  print j
 else:   print j,

print
print "length of remaining unmatched numbers list is " + str(len(myNumbers)) 
print "length of remaining matched numbers list is " + str(len(matched)) 

ipserver.py

#!/usr/bin/env python
#
# 
import os
import cgi


def main():
 print 'Content-Type: text/plain'
 print ''
        print os.environ['REMOTE_ADDR']
   

if __name__ == "__main__":
        
 main()

Integer division in Python 3.0

>python
Python 2.5.1 (r251:54863, Feb  4 2008, 21:48:13) 
[GCC 4.0.1 (Apple Inc. build 5465)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> 200/400
0
>>> 200.0/400
0.5
>>> from __future__ import division
>>> 200/400
0.5
>>> 200//400
0
>>> print "In Python 3.0 200/400 will yield 0.5"
In Python 3.0 200/400 will yield 0.5
>>> 

Easy Access to Python

Goal: Have methodology for quickly accessing anything about Python. While programming, do not have completed thought process without aid of computer stored information.

>pydoc -g
      |
      |
      +--+ opens Tkinter window

       |
       |
      +-+ open browser
            |
            |
            + Python: Index of Modules

http://python.org/doc/2.5/lib/development.html

NSLOOKUP in Python

from socket import gethostbyaddr 

def nslooky(ip):
      try: 
           output = gethostbyaddr(ip)
           return output[0]
     except: 
           output = "not found" 
           return output

 your_ip = request.META.get('REMOTE_ADDR') 
# above is Django module object
 your_name = nslooky(your_ip)

Original code by Cluther

Excellent tutorial on Operating System access via Python

Working with the Operating System

Lance's Django/Python Powered iMac Web Server

My home server is where I'm learning Python and Django. I'm creating content that shows the Python/Django code and resulting HTML.
See it here-->http://64.81.169.244/

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My Favorite Appspots

• http://codereview.appspot.com/
• http://shell.appspot.com/ (source)

Game of Life on a Hexapent

http://www.4dsolutions.net/ocn/life.html

Where are the Python modules in this computer?

Start you python command prompt, and type:
>>import sys
>>sys.path
( it will print out a list of directories)

Another way is write a python script that prints the list out a little prettier:

#!/usr/bin/env python
import sys

for x in sys.path:
        print x
# add to the list of paths with this:
a="/Users/lance/bin/"
sys.path.append(a)

Python URLLIB

This is the most useful resource I've found on URLLIB: http://blog.doughellmann.com/2008/03/pymotw-urllib.html

my projects hosted at code.google.com

• python: code.google.com/p/quick-math/
• bash: code.google.com/p/metamount/
• bash: code.google.com/p/filemultiplexer
• bash: code.google.com/p/ab-command
• bash: code.google.com/p/apple-get-mac-address/