In Python, the members of classes indicated with a leading underscore is

Question

BlackTom AI · Accepted Answer

Question restatement: In Python, the members of classes indicated with a leading underscore is

Options:
1) A normal member, indicated as protected by convention
2) A member that is accessible only to classes inheriting from it
3) A member that is not accessible outside of class even for those that inherit from it
4) You cannot use a leading underscore

Analysis:
Option 1: 'A normal member, indicated as protected by convention' — This is the correct interpretation. In Python, a single leading underscore on an attribute or method (for example, _value) is a convention signaling that it is intended for internal or protected use, i.e., by convention it is not part of the public API. This is not enforced by the language, but rather a programmer-guided hint to users of the class.
Option 2: 'A member that is accessible only to classes inheriting from it' — This describes true access control like protected access in languages that enforce it. Python does not enforce access restrictions based on inheritance; any code can access a member starting with a single underscore. The presence of the underscore is only a convention, not a rule.
Option 3: 'A member that is not accessible outside of class even for those that inherit from it' — This would imply strict access control, which Python does not implement with a single underscore. In Python, such a member remains accessible to external code; the underscore is a hint, not a barrier. If stricter access were needed, name mangling with double underscores would be involved, which is a different mechanism.
Option 4: 'You cannot use a leading underscore' — This is false. Python allows leading underscores in identifiers; they are commonly used to indicate private or protected-like members by convention.

Summary: The only statement aligning with Python’s convention is that a leading underscore marks a member as being protected by convention, not by language-enforced access control. The other statements misstate how Python handles visibility and access to such members.

SOFT3202 COMP9202 (ND) Quiz 1

In Python, the members of classes indicated with a leading underscore is

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