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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.
Common Errors and Messages Here are some common Python errors and error messages to look out for. Please let us give if you have any favorite additions for this list.
Your assignment for the semester will involve the development of a system for drawing trees using the Python programming language and the turtle graphics module (turtle.py). Comple
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
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
source code
List Comprehensions Python has a very nice built-in facility for doing many iterative methods, known as list comprehensions. The basic template is [
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
Interacting with the environment Computer systems have to communicate with the world around them, getting information about the external world, and taking actions to cha
What are squared matrices?
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
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