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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.
Non-local references in procedures There is an important subtlety in the way names are handled in the environment created by a function call. When a value that is not
Write a program that asks the user to enter a number of seconds. The responses of the program will vary depending on the length of seconds: • If the number of seconds is under 60
a code to add two numbers
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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
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
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
Tuples and strings Python has two different more list-like data types that are very important to understand.A tuple is a structure that is like a list, but is not mutab
from urllib2 import urlopen # Open http://placekitten.com/ for reading on line 4! response = kittens.read() body = response[559:1000] # Add your ''print'' statement here!
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