PCPP-32-101 1.11 (De)serialize Python Objects PCPP-32-1 Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A developer is writing a caching system that stores the results of expensive function calls. The results are Python objects that may include custom class instances. The cache must be stored in memory as a bytes object so it can be sent to a remote cache server. Which function should the developer use to convert the result object to bytes?

   • Abytes(result)
   • Bstr(result).encode()
   • Cpickle.dumps(result)
   • Dpickle.dump(result, file)
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2. 2application · medium

   A system administrator maintains a Python script that stores configuration values in a dictionary. The script must persist this dictionary to disk so that a separate monitoring script can read and modify individual keys without loading the entire dictionary into memory. The configuration contains only strings, integers, and booleans. Which approach is most appropriate?

   • AStore the dictionary in a global variable and use multiprocessing.shared_memory to share it between scripts.
   • BWrite the dictionary to a plain text file in key=value format and parse it on each read.
   • CUse shelve.open() to create a persistent dictionary and access keys individually.
   • DSerialize the entire dictionary with pickle.dump() and reload it with pickle.load() each time a change is needed.
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4. 3foundation · easy

   Given the following code, what is the type of the variable `restored`?

   • Atuple
   • Bbytes
   • Cdict
   • Dstr
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5. 4foundation · easy

   What does the mode parameter in `shelve.open(filename, mode='c')` control?

   • AThe access permissions for the file, such as read-only or read-write.
   • BThe database open mode, such as read-only, read-write, or create-if-not-exists.
   • CThe compression level used to reduce the size of the stored data.
   • DThe file format used to store the data (e.g., JSON, XML, or binary).
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6. 5application · medium

   A developer is using the shelve module to store user session data. The script opens the shelf, writes several keys, and then needs to ensure all data is written to disk before the program continues. Which action is required?

   • AReassign the shelf variable to a new shelve.open() call.
   • BCall the flush() method on the shelf object.
   • CCall the sync() method on the shelf object.
   • DWait for the garbage collector to run.
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