How to Achieve the Functionality of PHP\'s `compact()` and `extract()` in Python?

Python Equivalents to PHP's compact() and extract()

In PHP, the compact() and extract() functions serve practical purposes for creating hashtables and updating local variables, respectively. Python offers similar functionality, although it adheres to distinct principles.

Python's Implementation of compact()

While not strictly recommended in Python, one can implement a compact()-like function as follows:

<code class="python">import inspect

def compact(*names):
    caller = inspect.stack()[1][0]
    vars = {}
    for n in names:
        if n in caller.f_locals:
            vars[n] = caller.f_locals[n]
        elif n in caller.f_globals:
            vars[n] = caller.f_globals[n]
    return vars</code>

This function introspects the caller's local and global variables to create a dictionary with specified variable values.

Python's Approach to Extract Functionality

Previously, it was possible to implement a Python equivalent of extract(), but this method is no longer supported. This reflects Python's preference for explicit variable assignment instead of dynamically updating local variables.

Alternative Approaches

If the need for compact() or extract()-like functions persists, consider whether your approach aligns with Pythonic principles of clarity and explicitness. Alternatives such as accessing variables directly or using data structures like dictionaries may be more appropriate in Python.

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