Learn Python in 2 days - Day 2

1. Day 2
Function, Object Oriented, Packaging

2. Function
Introduction
Function Parameters
Scope of Variables
Global statement
Default Argument Values
Keyword Arguments
The return statement
DocStrings in Functions
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3. Function : Introduction
Functions are reusable pieces of programs
Functions are defined using the def keyword
A function can take parameters
You can declare variables inside a function
definition
Functions can have optionals parameters too
Functions can have named arguments
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4. Function : Global statement
You can use the values of such variables defined
outside the function
Try to avoid the use of this global statement
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5. Function : Parameters
Parameters are specified within the pair of
parentheses in the function definition,
separated by commas.
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6. Function : Scope of Variables
the parameter passed in is actually a reference to
a variable (but the reference is passed by value)
some data types are mutable, but others aren't
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7. Function : Default Argument Values
Used when you want to declare as an optional
argument
default argument value should be a constant
(immutable)
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8. Function : Keyword Arguments
You can give values for such parameters by
naming them - this is called keyword arguments
we use the name (keyword) instead of the
position, to specify the arguments to the
function.
Benefits of this feature
no need to remembers the order
we can give values to only those parameters which
we want
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9. Function : Keyword Arguments
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10. Function : Keyword Arguments
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11. Function : return
The return statement is used to return from a
function i.e. break out of the function.
We can optionally return a value from the
function as well.
In python can return one or move values
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12. Function : best way to return
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13. Function : DcdocStrings
documentation strings which is usually referred
by docstring
important tool, you should make use of it
we can even get back the docstring
from, say a function, when the program is
actually running!
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14. Function : working with DcdocStrings
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15. Object Oriented
Introduction
Classes and Constructors
Object Methods
Class, Object Variables & Properties
Inheritance
Iterators and Generator
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16. OO : Introduction
Declare a class with class keyword followed by
class name
class NewStyle(object):
""" NewStyle class decleration in Python 3.0 """
pas s
class OldStyle:
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17. OO : class and constructor
Creating constructors in Python is really easy;
Simple create a method __init__
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18. OO : arguments to constructor
Constructor is an like an methods
We can pass arguments to constructors
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19. OO : Object Methods
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20. OO : Class, Object Variables & Properties
Class variable are static variable
Variable declared with self are Object variable
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21. OO : Class, Object Variables & Properties
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22. OO : static method & object method
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23. OO : Inheritance
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24. OO : Magic method
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25. OO : Iterator and generator
Iterator objects in python conform to the iterator
protocol
which basically means they provide two methods:
__iter__() and next()
The __iter__ returns the iterator object and is
implicitly called at the start of loops.
The next() method returns the next value and is
implicitly called at each loop increment.
next() raises a StopIteration exception when
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26. OO : Iterator
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27. OO : generator
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28. Packaging
Modules : Introduction
Byte-compiled .pyc files
A module's __name__
Creating your own Modules
from..import
The dir() function
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29. Next Session ?
Installation of OpenERP
Working with LP
Understanding structure - Architecture
Customization Without Developments
Exercise: Room Reservation
Module - Minimal Structure
Module structure
Hello World – First module to OpenERP
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30. Contact me...
Mantavya Gajjar
Phone : 94263 40093
Email : mail@mantavyagajjar.in
Website : www.opentechnologies.in
Follow on Twitter : @mantavyagajjar
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