1. Debugging 101
Exterminating Vermin

2. Types of Errors
Syntax Errors
Runtime Errors
Logic Errors

3. Syntax Error A "grammatical" error in the program
Results in a ParseError message
Examples:
Missing punctuation
Malformed expressions
At runtime, interpreter scans entire program and discovers these before executing any of the program

4. Runtime Error
An error that occurs when the interpreter executes a statement
Examples:
NameError
Misspelled variable or function name
Use of variable in expression before it is assigned an initial value
TypeError
Operand of incorrect type for operator
ValueError
Passing wrong type of data to function

5. Logic Error The program appears to work without error
However, the output is not correct
Detect these using test cases

6. Using print() to Debug
During development, add print() statements at strategic places in the program to
help you understand how the program is working
see the values of variables
Comment out or remove the debugging print() statements before submitting

7. Debugging with print()
# A buggy version of chickenfeed with extra debugging print() statements
temperature = int(input('Enter the temperature in degrees fahrenheit: '))
totalWeight = int(input('Enter total chicken weight in pounds'))
if temperature <= 60:
print(‘It’s cold! temperature =‘, temperature) # for debugging
feedAmt = totalWeight * .12
elif temperature >= 90:
print(‘It’s hot! temperature =‘, temperature) # for debugging
feedAmt = totalWeight * .08
else:
print(‘It’s comfortable! temperature =‘, temperature) # for debugging
feedAmt = totalWeight * .1
print('Feed them ', feedAmt, " pounds of Robert's Best")