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#!/usr/bin/python -tt | |
# Copyright 2010 Google Inc. | |
# Licensed under the Apache License, Version 2.0 | |
# http://www.apache.org/licenses/LICENSE-2.0 | |
# Google's Python Class | |
# http://code.google.com/edu/languages/google-python-class/ | |
# Additional basic list exercises |
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#!/usr/bin/python -tt | |
# Copyright 2010 Google Inc. | |
# Licensed under the Apache License, Version 2.0 | |
# http://www.apache.org/licenses/LICENSE-2.0 | |
# Google's Python Class | |
# http://code.google.com/edu/languages/google-python-class/ | |
# Basic string exercises | |
# Fill in the code for the functions below. main() is already set up |
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#!/usr/bin/python2.4 -tt | |
# Copyright 2010 Google Inc. | |
# Licensed under the Apache License, Version 2.0 | |
# http://www.apache.org/licenses/LICENSE-2.0 | |
# Google's Python Class | |
# http://code.google.com/edu/languages/google-python-class/ | |
# Additional basic string exercises |
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__INIT__: | |
The name __init__ is essentially reserved in python , special function or method.What's special about it ? Creates space in memory or initialzes | |
for class to remeber details of class attributes or variables. | |
class movie(): | |
def __init__(self,title,story): | |
self.title = "hero" | |
self.storyline = "drama" | |
somehow initialize these variable(title,story) with information init is going to receive.And in particular it is going to receive the information while |
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Python2 --Range | |
1.It produces a list for itertions. | |
For x in range(3): | |
print x | |
O/p: | |
0 | |
1 | |
2 | |
y = range(5) |
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Basic Examples: | |
1.{ x^2: x is a natural number less than 10 } | |
[x*2 for x in range(0,10)] | |
2.{ x: x is a whole number less than 20, x is even } | |
[x for x in range(0,20) if x%2 == 0] | |
3.{ x: x is an alphabet in word ‘MATHEMATICS’, x is a vowel } | |
[x for x in "MATHEMATICS" x not in "AEIOU"] | |
======================================================================================= | |
The same gets implemented in a simple LC construct in a single line as: | |
[ output_expression() for(set of values to iterate) if(conditional filtering) ] |
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Mary had a little lambda, | |
as pure as snow | |
For every Program Mary wrote, | |
the lambda was all she needed to know |
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In Python access specifiers doesn't exist.Beacause it's considered as we all are adults here I mean if developerdoesn't want to aceess | |
a variable why will he. | |
In case if some variable needs to private it is initiated with '__'. | |
The main concept behind not having any of those logic is because, We used to have those access specifiers so | |
that out side classes will not be able to use the attribute of a class. But unless the developer will not try to | |
access a class within another class, They are not going to be used like that. | |
So default is public anyone can access any method anywhere. | |
But, You can privatize them in a different and more logical way. Using _ or __ . | |
__ can be used to define private attributes in a class. by default we define all variable names as words, |
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What is Exception? | |
An exception is an error that happens during execution of a program. When that | |
error occurs, Python generate an exception that can be handled, which avoids your | |
program to crash. | |
Why use Exception? | |
Exceptions are convenient in many ways for handling errors and special conditions | |
in a program. When you think that you have a code which can produce an error then | |
you can use exception handling | |
Raising an exception breaks current code execution and returns the exception | |
back until it is handled. |
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#! /usr/bin/python | |
#Opening the file | |
f0 = open("out.txt","rw+") #File containing the original testing report. | |
f1 = open("new.txt","rw+") #File containg the report in string format | |
f2 = open("new3.txt","rw+")#File containing the required fields in string format | |
f3 = open("book2.csv","w+")#csv file with the value for keys | |
#function to remove whitespaces from file out.txt and writing it in new.txt |
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