pyteuf is a package for time-frequency analysis/synthesis with possibly missing data in Python. pyteuf provides: - a time-frequency 2D data structure TfData to manipulate time-frequency representations, either complex (STFT, etc.) or real (spectrograms, etc.) in which some coefficients may be missing (missing amplitude, missing phase, or both), - a class Stft and a class Istft, which are an interface to ltfatpy in order to facilitate the use of direct and inverse short-time Fourier transforms.