Select all correct definitions of functions making sure to adhere to best practices.

Question

BlackTom AI · Accepted Answer

Snake_case naming and valid Python syntax are the key items here: functions should be defined with the def keyword, use clear names in snake_case (PEP8), and have valid Python statements.

1) Relevant knowledge points and concepts
- Python functions must start with def followed by a valid identifier and parentheses, e.g. def my_func(...):.
- PEP8 style recommends snake_case for function and variable names (avoid camelCase).
- Using non-Python keywords (e.g. function) is a syntax error.
- A function that prints is valid (it has a side effect); a function that returns a value is also valid. Both can be acceptable depending on intended use.

2) Step-by-step reasoning for each option
- a: def tax_value(): gst = 0.10 return gst
  - Syntax is correct (uses def). Name tax_value is snake_case. The function returns a numeric constant. While one might move a constant to module-level, this definition is valid and follows naming/syntax best practices.
- b: def say_hi(name): print("Hi, " + str(name))
  - Syntax is correct and name is snake_case. Converting name to str is safe for printing. Printing is a legitimate function behavior for a greeting; this follows best practices for naming and syntax.
- c: def calculateGST(itemValue): return itemValue*0.1
  - Syntax executes, but the function name calculateGST and parameter itemValue use camelCase. PEP8 best practice is snake_case (calculate_gst, item_value), so this fails the “adhere to best practices” requirement.
- d: def calculate_gst_due(items): gstDue = 0 for item in items: gstDue += float(item) * 0.1 return gstDue
  - Function name is snake_case (good), but the internal variable gstDue uses camelCase (should be gst_due). Mixing styles violates PEP8. (Also minor: converting each item to float assumes items are numeric strings; not necessarily a best-practice guarantee.)
- e: function count_cookies(jar): return length(jar)
  - This uses the non-Python keyword function (syntax error) and length(jar) is not Python (len(jar) is correct). So e is invalid.

3) Conclusion
Options a and b follow Python syntax and naming best practices, while c, d, and e violate style or syntax rules. Therefore the correct selections are a. and b., matching the provided answer.

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