Write clear Python, classify errors, and debug with confidence.
Arrange a short sequence and watch the robot follow exactly what you provide.
Add steps to your algorithm.
Algorithm is empty.
Select commands to start.
A precise, step-by-step procedure for solving a specific task.
An algorithm is the plan. A program expresses the plan in instructions Python can run.
📝 → 💻
Clear steps become code
Python follows the instructions we write. Their order, spelling, and symbols all matter.
Mistakes are normal. The first useful question is: what kind of error is this?
The symptoms tell us where to begin looking.
Syntax Error
Breaks Python's grammar, so the program cannot start normally.
Logic Error
Runs without crashing, but produces the wrong result.
Runtime Error
The program starts, then fails during execution.
Classify the problem before trying to fix it.
Question
You type an email address without the @ symbol. The form immediately reports an invalid format and refuses to continue.
Which error family does this describe?
Classify the problem before trying to fix it.
Question
A GPS app runs normally and announces that you have arrived, but it guided you to the wrong street.
Which error family does this describe?
Classify the problem before trying to fix it.
Question
A mobile game opens successfully, but it suddenly closes during the third level.
Which error family does this describe?
Quotes tell Python that the characters inside are text data.
💬
"Hello, Python!"
The quotes mark the boundaries. The text between them is the string literal.
Text, Not Instructions
Python displays the characters inside instead of trying to execute them.
Matching Quotes
A string must begin and end with matching quote characters.
Predict what Python will display before the program runs.
Python executes each instruction from top to bottom.
print() displays its arguments and then moves to a new line by default.
Function Name
print tells Python to display a value.
Argument
The parentheses hold the value passed to print.
New Line
After each print() call, Python moves to the next line by default.
What exactly appears in the output? Include spaces and line breaks.
A backslash gives special meaning to the character that follows it.
New Line
Moves the output to the next line.
Double Quote
Prints a quote inside text.
Backslash
Prints one backslash.
What exactly is printed?
Classify the error, then notice the two places a comment can appear.
For Humans
A comment explains purpose, choices, or reminders to the reader.
Starts with #
Everything after # on that line is treated as a comment.
Not Output
Python ignores the comment when it runs the program.
An error message is evidence that helps you choose the next change.
The closing quote completes the string, so Python can run both instructions.
Complete it on time and submit it before the deadline.
Key takeaways from this lesson.
Classify
Errors can be syntax, logic, or runtime errors.
Output
Strings, print(), and escape sequences control displayed text.
Debug
Read, compare, change one thing, and run again.
Use the symptom, not a guess, to choose the error family.
1. Write Syntax, Logic, or Runtime for each situation.
A. A missing quote prevents a program from starting. B. A calculator runs but adds instead of multiplying. C. A game closes only when a level loads.
Write the exact output before running the code.
1. Predict every space and line break in the output.
2. Run the code and compare the result with your prediction.
Use string literals and escape sequences to reproduce the target exactly.
1. Write a Python program that produces the target output exactly.
2. Use at least one \n, one \", and one \\.
PYTHON PROFILE Name: "Ada" Path: C:\Python Ready! Go!
Document the program without changing what it prints.
1. Add one full-line comment describing the program.
2. Add one comment after a code line.
3. Run the program and confirm that the output is unchanged.
Repair the program, then extend it without introducing new syntax errors.
1. Classify the error that prevents this program from running.
2. Repair the smallest broken detail and run again.
3. Add two profile lines, including one comment after a code line.
4. Check every space, quote, and line break in the final output.