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ysoisochrone is a Python3 package that handles the isochrones for young stellar objects (YSOs), and utilize isochrones to derive the stellar mass and ages. Our primary method is a Bayesian inference approach, and the Python code builds on the IDL version developed in Pascucci et al. (2016). The code estimates the stellar masses, ages, and associated uncertainties by comparing their stellar effective temperature, bolometric luminosity, and their uncertainties with different stellar evolutionary models, including those specifically developed for YSOs. User-developed evolutionary tracks can also be utilized when provided in the specific format described in the code documentation.