Just like PerlTeX or PyLuaTeX (and unlike PythonTeX or lt3luabridge), this only requires a single run, and variables are persistent throughout the run. Unlike PerlTeX or PyLuaTeX, there is no restriction on compiler or script required to run the code. There are also debugging functionalities: TeX errors result in Python traceback, and Python errors result in TeX traceback. Errors in code executed with the pycode environment give the correct traceback point to the Python line of code in the TeX file. For advanced users, this package allows the user to manipulate the TeX state directly from within Python, so you don’t need to write a single line of TeX code. CAUTION: In addition to this LaTeX package you need the Python pythonimmediate-tex package, which can be obtained from https://pypi.org/project/pythonimmediate-tex/.