Section 6.9 of your textbook ("Debugging") lists three possibilities to consider if a function is not working. Describe each possibility in your own words. Define "precondition" and "postcondition

Section 6.9 of your textbook ("Debugging") lists three possibilities to consider if a function is not working.

• Describe each possibility in your own words. 
• Define "precondition" and "postcondition" as part of your description. 
• Create your own example of each possibility in Python code. List the code for each example, along with sample output from trying to run it.