Local and global variables
Functions, Modules and Packages example from a Well House Consultants training course
More on Functions, Modules and Packages [link]
Source code: locvar.py Module: Y105
# Variable scope
first = 1
"Double a global variable, return it + 3."
first *= 2
result = first+3
print("first now has the value",first)
print("result has the value",result)
** Important Note **
This is an example from our training material and illustrates
variable scope in Python. The variable called result within the
one function is local to that function, so is not visible outside
and so the program generates an error when run, as follows:
WomanWithCat:y105 grahamellis$ python3 locvar.py
Double a global variable, return it + 3.
first now has the value 8
Traceback (most recent call last):
File "locvar.py", line 21, in <module>
print("result has the value",result)
NameError: name 'result' is not defined
The subject of varaible scope and why "default local" is a good
idea is full covered in the training notes from which the code
above is copied ... see http://www.wellho.net/course/ypfull.html """
Learn about this subject
This module and example are covered on the following public courses:
* Learning to program in Python
* Python Programming
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