Errors

Errors

1. Syntax errors

   • Syntax errors are the easiest to find and fix
   • Your code will not run at all if there is a syntax error
     • An error message will show the exact line containing the error
       • The error message will tell you exactly which line contains the syntax error
   • It happens when your code contains something that is not valid python
   • Code with syntax errors will not run at all

2. Runtime errors

   • Runtime errors occur when your code is valid python, but is instructing the computer to do something it doesn’t know how to do
   • Unlike syntax errors, code containing runtime errors will run, but will crash if and when the error is encountered
   • Runtime errors are harder to fix because it’s possible to run through a program without ever encountering the error, so it may not be spotted
   • Types of runtime errors
     • Name error
     • Value error
     • Zero division error
     • Type error

3. Logic errors

   • In a logic error, no programming mistakes have been made, and the program runs to completion without any errors, but the output is not correct.
     • The program “correctly does the wrong thing”
   • A Logic error is the hardest error to fix because there is no crash, so it’s hard to know exactly where the mistake is
     • Often we have to trace through the program to spot where it went wrong

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