Python Institute PCPP-32-101 Exam - Topic 6 Question 38 Discussion

Actual exam question for Python Institute's PCPP-32-101 exam

Question #: 38
Topic #: 6

Select the true statements related to PEP 8 programming recommendations for code writing. (Select two answers:)

AYou should use the not ... is operator (e.g. if not spam is None:), rather than the is not operator (e.g. if spam is not None:), to increase readability.

BYou should make object type comparisons using the ismstanceQ method (e.g. if isinstance (obj, int) :) instead of comparing types directly (eg if type(obj) is type(i)).

CYou should write code in a way that favors the CPython implementation over PyPy, Cython. and Jython.

DYou should not write string literals that rely on significant trailing whitespaces as they may be visually indistinguishable, and certain editors may trim them

Show Suggested Answer

Suggested Answer: B, D

Option B is true because theunbind()method is invoked from within a widget's object1.

Option D is true because theunbind()method needs the event name as an argument1.

Theunbind()method in Tkinter is used to remove a binding between an event and a function. It can be invoked from within a widget's object when a binding is no longer needed. The method requires the event name as an argument to remove the binding for that specific event. For example:

button = tk.Button(root, text='Click me')

button.bind('<Button-1>', callback_function) # bind left mouse click event to callback_function

button.unbind('<Button-1>') # remove the binding for the left mouse click event

by Lisbeth at Sep 18, 2024, 02:44 AM

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Sherrell

4 months ago

I agree with B, type comparisons should be clean and clear!

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Colene

4 months ago

Wait, is C really a thing? That seems odd.

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Dortha

4 months ago

D makes sense, trailing spaces can be a pain!

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Nana

4 months ago

I thought A was right too, but I prefer is not for clarity.

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Brock

4 months ago

B is definitely true, using isinstance is the way to go!

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Aliza

5 months ago

I definitely recall that PEP 8 recommends using isinstance for type comparisons. It makes sense to avoid direct type checks!

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Maryann

5 months ago

I’m a bit confused about the is vs. is not operators. I thought both were acceptable, but maybe one is more readable?

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Providencia

5 months ago

I feel like I saw a practice question about avoiding trailing whitespaces in string literals. That one seems important for readability.

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Val

5 months ago

I think I remember that using isinstance is preferred for type checking, but I'm not entirely sure about the specifics.

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Mozelle

5 months ago

Trailing whitespaces, huh? I didn't know that was something to watch out for. Good to know for writing clean, readable code.

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Judy

5 months ago

The part about favoring CPython over other implementations is new to me. I'll make sure to read up on that before the exam.

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Rasheeda

5 months ago

Ah, I remember the recommendation about using isinstance() instead of directly comparing types. That's a good tip to keep in mind.

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Dorthy

5 months ago

Hmm, I'm a bit unsure about the difference between "not ... is" and "is not". I'll need to review that part of the PEP 8 guidelines.

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Ahmed

5 months ago

This looks like a straightforward PEP 8 question. I'm pretty confident I can handle this one.

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Dorothy

10 months ago

Wait, PEP 8 actually recommends something other than 'import this'? I'm shocked! I'll just go with the flow and pick B and D.

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Carma

9 months ago

Definitely, B and D seem like solid choices based on PEP 8 guidelines.

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Florinda

9 months ago

I think B and D are the way to go as well. PEP 8 has some useful recommendations.

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Galen

10 months ago

I agree, PEP 8 has more to offer than just 'import this'. B and D are good choices.

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Anthony

11 months ago

Haha, 'is not' over 'not... is'? That's like saying 'this is not not true' instead of 'this is true'. Gotta go with A and D, folks.

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Kasandra

9 months ago

It's important to prioritize readability and avoid potential issues with certain editors.

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Sharen

9 months ago

I always try to follow PEP 8 recommendations for code writing.

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Justa

10 months ago

Definitely, using 'is not' can be confusing.

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Meaghan

10 months ago

I agree, A and D are the correct choices.

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Mickie

11 months ago

C? Really? Who cares about CPython when we have the mighty PyPy and Cython? I'm going with B and D, thank you very much.

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Alfred

10 months ago

CPython may have its advantages, but PyPy and Cython are definitely powerful options.

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Abel

10 months ago

I agree with you, B and D are the way to go.

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Benedict

11 months ago

B is definitely the way to go. I once spent hours debugging a weird issue because I didn't use isinstance(). Never again!

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Ligia

11 months ago

I'm not sure about C, but I think B is also a valid statement based on PEP 8 guidelines.

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Desiree

11 months ago

I agree with Gaston, A and D make sense for following PEP 8 recommendations.

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Nancey

11 months ago

A and D? Seriously, who would ever use 'is not' instead of 'not... is'? And trailing whitespaces? What is this, the 90s?

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Gaston

11 months ago

I think A and D are true statements.

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