3. Python Services

The modules described in this chapter provide a wide range of services related to the Python interpreter and its interaction with its environment. Here's an overview:

sys: --- Access system specific parameters and functions.
types: --- Names for all built-in types.
traceback: --- Print or retrieve a stack traceback.
pickle: --- Convert Python objects to streams of bytes and back.
shelve: --- Python object persistency.
copy: --- Shallow and deep copy operations.
marshal: --- Convert Python objects to streams of bytes and back (with different constraints).
imp: --- Access the implementation of the import statement.
__builtin__: --- The set of built-in functions.
__main__: --- The environment where the top-level script is run.

3. Python Services

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