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Time-resolved photoluminescence (TRPL) is a powerful tool to extract the material and optoelectronic properties of semiconductors. However, extracting relevant information from TRPL data can be challenging as many complex electron dynamics can exist in these materials. Therefore, simulating TRPL data as a function of various material properties is of interest to better understand these electron dynamics and correlate with measured data. Dedicated commercial software for simulating transient electron dynamics is, however, limited and cost-prohibitive. Here we introduce an open-source program that we have developed to simulate transient electron dynamics in semiconductors. This program uses numerical methods to solve non-linear coupled differential equations as these equations governing the transient diffusion, drift, and the decay of electrons – whose recombination is a precursor to photon emission – can generally not be solved analytically. Our Python application for generating, visualizing, and exporting electron dynamics and TRPL data will be shown. In addition, example TRPL simulations in comparison to experimental data will be shown for thin-film photovoltaic absorbers and semiconducting nanowires.