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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.
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
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Expressions and assignment We can think of most computer programs as performing some sort of transformation on data. Our code may get as input the exam scores of everyone in
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
List Comprehensions Python has a very nice built-in facility for doing many iterative methods, known as list comprehensions. The basic template is [
Write a Python program to accomplish the following. Use modular design. Include at least 3 functions: one that returns zero values, one that returns one value, and one that retu
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Import the sample code below into the Python IDLE and enhance it, run it and debug it. Add features to make this a more realistic database tool by providing for easy data entry an
Print vs Return Here are two different method declarations: def f1(x): print x + 1 def f2(x): return x + 1 What happens when we call them? >>> f1(3) 4 >>
Bank transfer What if we have two values, representing bank accounts, and need to transfer an amount of money amt between them? Consider that a bank account is show
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