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Range
Very frequently, we will want to iterate through a list of integer values, often as indices. Python gives a useful function, range, which gives lists of integers. It may be used in complex types, but the basic usage is range(n), which gives a list of integers going from 0 up to, but not adding, its argument. So range(3) returns [0, 1, 2].
Structured assignment Once we have tuples and lists, we may use a nice trick in assignment expression, based on the packing and unpacking of tuples. >>> a, b, c = 1, 2
You should use for whenever you can, because it creates the structure of your loops clear. Sometimes, however, you require to do an operation various times, but you don't want t
Models It is a new system that is considerably easier than the system being modelled, but which saves the important points of the original machine. We might create a physical
Perimeter of a polygon Now, let's consider the problem of computing the length of the perimeter of a polygon. The input is a structure of vertices, encoded as a list of list
We encourage you to adopt an interactive style of debugging and programming. Use the Python shell a lot. Write short pieces of code and check them. It is much simpler to test the
What if you had a list of integer values, and you need to add them up and give the sum? Here are a number of different types of doing it. First, here is a type in a style
List mutation and shared structure Lists are mutable data structures, which defines that we can actually modifies the values stored in their components. We do this by usi
Procedures in Firrst-class objects In Python, unlike many other languages, methods are behave in much the same way as num bers: they can be stored as values of variabl
List Comprehensions Python has a very nice built-in facility for doing many iterative methods, known as list comprehensions. The basic template is [
from urllib2 import urlopen var= ('' response">http://placekitten.com'') response = kittens.read(body) body = response[559:1000] print ''Kittens:'', response
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