Pythonandyou for Blog 110911070003 Phpapp01

8/12/2019 Pythonandyou for Blog 110911070003 Phpapp01

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By

Karthik Prakash


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Introduction to Python nteractive ShellBasic Types and ContainersControl Structures


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Remarkable power with very clear syntax

Python is an Interpreted, Object Oriented

Programming language.

its named after a television series MontyPythons Flying Circus

It was created by Guido Van Rossum in the year1990


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Features :-

Free and Open Source Maintained by the PSF (PythonSoftware Foundation)

Rapid Prototyping

Compiled to interpreted byte code .. sometimes called asScripting language.i.e Compilation is implicit

Indentation for block structure

Life's better without braces(Bruce Eckel)

Extremely Portable (Windows,Linux,Unix,Mac etc)

Powerful Standard libraries


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Two variations: IDLE (GUI) and PYTHON (command line)

Most Python implementations work on CLI (Command LineInterface)

Great for learning the language by experimenting with the library

Great for testing your own modules

Benefits of IDLE

Multi Windows Text Editor

Interactive Command Shell Syntax Highlighting

Auto-Indentation

Auto Completion extended to Intellisence


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None Numbers and Floats Complex Numbers . (i + j) Floating point

Boolean. True or False Strings uUnicode Tuples () Lists []

Dictonaries {}

Built-in Function type()


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List Comprehension

Functions

Doc Strings Smart way of Documenting modules

File Handling read , write , append to file


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Single[ for itemin sequence]

NestedSpecial care has to be taken for the nestedlist

comprehension:

.when nesting list comprehensions, read fromright to left.


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Function Definition :def name (arg1, arg2. , argn)

Documentation #optional

statements

return expression

name(arg1,arg2) # Call to


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File Modes Mode Meaning 'r' open for reading (default)

'w' open for writing, truncating thefile first

'a' open for writing, appending to theend of the file if it exists

'b' binary mode


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f = open(filename, [mode])

read(), readline(), readlines()

write(), writelines()

seek(pos), tell()

close()


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Classes

Class Definition

Class Objects

Class Data members

Class Methods

Class Inheritance


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classStack:"A well-known data structure"

def __init__(self): # constructorself.items = []

def push(self, x):

self.items.append(x) #. Push into the Stackthe sky is the limit

def pop(self):

x = self.items[-1] # Pop from the stack

del self.items[-1]return x

def empty(self):

return len(self.items) == 0 # Boolean result


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object = Stack() #--- Object of the ClassStack

.. Constructor invoked during Object instantiation

object.push(arg1) #---- Call to Class Method push

print object.items #---- Access the Class Data Member


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class BaseClass:

baseDataVar = 10

def baseMethods(self)statements

class DerivedClass(BaseClass):def Method()

print self.baseDataVar

self.baseMethods() #-- Call to base class method

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Pythonandyou for Blog 110911070003 Phpapp01