Add month value in python

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This is short and sweet method to add a month in a date using relativedelta.

from datetime import datetime
from dateutil.relativedelta import relativedelta

date_after_month = datetime.today()+ relativedelta(months=1)
print 'Today: ',datetime.today().strftime('%d/%m/%Y')
print 'After Month:', date_after_month.strftime('%d/%m/%Y')

Output:

Today: 01/03/2013

After Month: 01/04/2013

Easy way to remove duplicate items from a list using set.

A program to check if a list has any duplicates and if it does it removes them and returns a new list with the items that werent duplicated/removed.
In Python it can be done easily. First make a set from the list and then make a list for that set.

 a_List = list(set(a_List))  

Here is a python example:

 >>> a_List = [1, 2, 3, 3, 2, 2, 4, 5, 5]  
 >>> a_List  
 [1, 2, 3, 3, 2, 2, 4, 5, 5]  
 >>> a_List = list(set(a_List))  
 >>> a_List  
 [1, 2, 3, 4, 5]  

Comments are always welcome!
Have a Happy Python!

Calculate time difference in minutes

Below code will explain how to find a difference in the minute,
if you have two dates, then you can find the difference of the time using divmode function of python

 >>> import datetime  
 >>> end = datetime.datetime.now()  
 >>> start = datetime.datetime.now()  
 >>> diff  
 datetime.timedelta(0, 7, 424199)  
 >>> diff = start - end  
 >>> divmod(diff.days * 86400 + diff.seconds, 60)  
 (0, 7) # 0 minutes, 7 seconds  

Creating generators objects in python

What is Generator?

A generator is a function which can stop whatever it is doing at an arbitrary point in its body, return a value back to the caller, and, later on, resume from the point it had `frozen' and merrily proceed as if nothing had happened (link) . Here is a simple example: 

if you write 

x = [n for n in foo if bar(n)]

you can get the list object assigned to the x.

x=(n for n in foo if bar(n))

you can get out the generator and assign it to x. Now it means you can do

Monkey patching objects in python

Every object in Python has a __dict__ member, which stores the object's attributes.
So, you can do something like this:

 class surf(object):  
   def __init__(self, arg1, arg2, **kwargs):  
     #do stuff with arg1 and arg2  
     self.__dict__.update(kwargs)  
 s = surf('arg1', 'arg2', bar=20, baz=10)  
 # Here s is a object of surf with two extra attributes.  

Built-in getattr function

 You can get a reference to a function without knowing its name until run-time, by using the getattr function.

 class Cls():  
   def getfood(self):  
     self.food = ['Cheese', 'Pizza', 'Burger', 'Hotdog', 'Pie', 'Fires']  
     return self.food  
 c = Cls()  
 print getattr(c, 'getfood')() 

The output of following code will be

 ['Cleese', 'Palin', 'Idle', 'Gilliam', 'Jones', 'Chapman']

Devide a list in n sized chunks.

Here is the method to devide list in to chunks of n size

 def chunks(list, size):  
   for i in xrange(0, len(list), size):  
     yield list[i:i+size]  
 for list in list(chunks(product_without_season, 1000)):  
   print list