Programming fundamentalsLesson 3 of 5 in the course Statements

Reading Python Tracebacks and Diagnosing Common Errors

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

Save course
Lesson progress
0 / 5

Your progress is kept in this browser only.Sign up to save it

Summary

Programming mistakes are a normal part of writing code—even experienced programmers encounter them. When Python cannot understand or carry out instructions, it reports an error. Learning to read that report helps you locate and correct problems efficiently.

File "example.py", line 1 print "Hello!" ^ SyntaxError: Missing parentheses in call to 'print'. Did you mean print("Hello!")?

All flashcards

What is a traceback?
A Python report that identifies where an error was encountered and provides its type and details.
What information does an error type provide?
It identifies the general kind of problem, such as invalid syntax, an unrecognized name, or invalid indentation.
What is a common cause of a SyntaxError?
Code Python cannot parse, such as a missing closing parenthesis or quotation mark.
Why can a misspelled variable cause a NameError?
Python treats differently spelled names as different identifiers; referring to an undefined name can raise a NameError.
How should you handle a program that reports errors one at a time?
Read the error, correct the likely cause, and run the program again to check for further errors.

Quiz questions

  1. What information does a Python error message commonly include?Answer: A line reference, an error category, and diagnostic details.
  2. What does the caret (^) in an error message indicate?Answer: Where Python detected a problem, though the underlying mistake may be nearby.
  3. Given `word = "cat"` followed by `print(wird)`, which error type is likely?Answer: NameError
  4. A top-level Python line begins with unintended whitespace. Which error type might be reported?Answer: IndentationError
  5. After one error is fixed, running a program reveals another. What should you do?Answer: Inspect the new error and nearby code, make a correction, and run the program again.

Based on Introduction to Python Programming by Udayan Das, Aubrey Lawson, Chris Mayfield, Narges Norouzi (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

More in Programming fundamentals

All Programming fundamentals lessons
Programming fundamentalsTracing Conditional and Function-Call Control Flow5 flashcards · 5 quiz questions · 4 gamesPlay free →Programming fundamentalsWhile Loops: Conditions, Counters, and Input-Controlled Repetition5 flashcards · 5 quiz questions · 4 gamesPlay free →Programming fundamentalsVariable Scope: Global and Local Variables in Python5 flashcards · 5 quiz questions · 4 gamesPlay free →Programming fundamentalsPython Function Arguments, Defaults, and PEP 8 Spacing5 flashcards · 5 quiz questions · 4 gamesPlay free →Programming fundamentalsRecursive Cases and Base Cases in Elementary Math Functions5 flashcards · 5 quiz questions · 4 gamesPlay free →Programming fundamentalsRecursive Binary Search, Three Towers, and Coin-Toss Sequences5 flashcards · 5 quiz questions · 4 gamesPlay free →