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Modules
As you start to write larger programs, you will want to save the function de?nitions in multiple ?les, collected together according to what they do. So, for example, we may collect a set of utility functions together into in one file, called utility.py. This ?le is known as a module in Python.
Now, if we want to use those procedures in another shell or file, we will require to say import utility so that all those procedures become available to us and to the Python interpereter. Now, if we have a function in utility.py named foo, we may use it with the name utility.foo. You may study more about modules, and how to instance reference functions described in procedures, in the Python documentation.
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
Every programming language has to have some method for indicating grouping of operations. Here is how you execute an if-then-else structure in Java: if (s == 1){ s = s
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Normalize a vector Let's imagine we want to normalize a vector of three variables; that is to compute a new vector of three values, such that its size is 1. Here is o
List Comprehensions Python has a very nice built-in facility for doing many iterative methods, known as list comprehensions. The basic template is [
In Python, the fundamental abstraction of a computation is as a procedure (other books call them "functions" instead; we will end up using both values). A function that tak
from urllib2 import urlopen var= ('' response">http://placekitten.com'') response = kittens.read(body) body = response[559:1000] print ''Kittens:'', response
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
Worked example 1 Let's examine what happens when we compute the following Python code: def p(x, y): z = x*x - y return z + 1/z >>> p(1.0, 2.0) -2.0
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