PyCall

Allows importing any Python module as a Ruby module, making functions callable with minimal syntax, as shown in the README example with math.sin.

Handles conversions for basic types like numbers, strings, arrays, and hashes without manual intervention, simplifying cross-language data passing.

Maps Python constructors to .new and callables to .(), with keyword arguments using Ruby hash syntax, making Python code feel natural in Ruby.

Provides PyCall.without_gvl to release Ruby's GVL during long Python calls, improving concurrency in blocking operations, as documented in the usage section.