PCAP-31-03 1.5 Create and Use User-Defined Modules and Packages PCAP-31 Practice Questions (Page 5)

Questions 21–25

1. 21expert · medium

   A developer has a package `mypkg` with the following structure: ``` project/ main.py mypkg/ __init__.py sub/ __init__.py helper.py ``` The developer runs `main.py` from the `project` directory. The import `from mypkg.sub import helper` fails with `ModuleNotFoundError`. The developer checks `sys.path` and confirms `project` is listed. What is the most likely cause of the failure?

   • AThe `main.py` file must be inside the `mypkg` package.
   • BThe `sub` directory is missing an `__init__.py` file.
   • CThe `helper.py` file is missing a leading underscore in its name.
   • DThe `__pycache__` directory is missing.
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2. 22foundation · easy

   What happens when Python executes the statement `import mymodule` for the first time?

   • AIt copies the module's source code into the current file.
   • BIt executes the code in `mymodule.py` and makes its names available under the `mymodule` namespace.
   • CIt only checks for syntax errors and does not execute any code in the module.
   • DIt creates a new function named `mymodule` in the current namespace.
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4. 23foundation · easy

   What is the primary purpose of the `__pycache__` directory created by Python?

   • ATo keep a log of all import statements executed by the program.
   • BTo prevent modules from being modified after they are imported.
   • CTo store the original source code of imported modules for backup.
   • DTo store compiled bytecode files so that subsequent imports can be faster.
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5. 24application · medium

   A developer creates a package `shapes` with the following structure: ``` shapes/ __init__.py circle.py square.py ``` The `__init__.py` file is currently empty. The developer wants `import shapes` to automatically make the `circle` submodule available as `shapes.circle`. What should be added to `__init__.py`?

   • A`__all__ = ['circle']`
   • B`import circle`
   • C`from circle import *`
   • D`from . import circle`
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6. 25application · easy

   A developer is writing a module `config.py` that contains a constant `_internal_token = 'abc123'` and a function `get_public_config()`. The developer wants to signal to other developers that `_internal_token` should not be accessed directly. What is the correct way to communicate this intent?

   • APlace the variable inside a `try`/`except` block so it is not defined when imported.
   • BUse the `private` keyword before the variable name.
   • CUse a leading underscore in the name, as in `_internal_token`, which by convention marks it as private.
   • DStore the variable in the `__pycache__` directory.
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