This is the Python source code for the software GAmma-Ray Monte-carlo Radiative transfer (GARMR). The code uses Monte Carlo approach to solve the propagation of photons in nova and supernova ejecta. It uses random number to determine the possible interactions of photons with the surrounding particles by Compton scattering, photoelectric absorption and photopair production, and computes the gamma-ray spectra and light curves of nova and supernova explosions. The detailed physics and validation are reported in the following article. The zip file here contains the necessary code with the setting which can reproduce similar results attached in the "output" directory. Detailed instruction is available in the README file and in the documentation of each class file. Reference: Shing-Chi Leung, A New Versatile Code for Gamma-Ray Monte-Carlo Radiative Transfer, arXiv:2205.04450 (2022)

{"references": ["Leung, Shing-Chi (2022): decouple software associated to arXiv:2205.04450"]}