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De?nition
A method de?nition has the abstract form:
def (, ..., ):
...
There are essentially three parts:
When we compute a procedure de?nition in an environment, E, Python does have two things:
1. Makes a procedure object19 that contains the formal parameters, the body of the function, and a pointer to E; and then
2. Binds the name to have this procedure as its value.
Here is a program of an environment after we have calculated
Note how the construct to which square points is a procedure body, with a number of formal parameters, a object, and a pointer to its environment.
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 exampl
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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 >>
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
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The goal of this exercise is to write a \business phrase" generator, which each time it is called produces lines of business speak, such as: It's time that we became uber-effici
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