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Matplotlib doesn't seem to find files in the current working directory when running latex. Does anyone know where it looks for files? The background is: I have a huge preamble that I \input into latex before processing (lots of macros, various usepackages, etc.). In a stand-alone paper, I do \input{BigFatHeader.tex} . So when I use matplotlib, I try to just input this file in the preamble. The python code to do this is matplotlib.rcParams['text.latex.preamble'].append(r'\input{BigFatHeader.tex}') And I can verify that that file is in the cwd -- I see it when I ls , or I can do os.path.isfile("BigFatHeader.tex") and get True. But when I try to plot something using latex, python spits out a big error message from the latex process, that culminates in ! LaTeX Error: File BigFatHeader.tex not found. So presumably it changes to some other directory (not /tmp/ ; I checked) to do its work. Any idea where this might be? My minimal working example is: import matplotlib import matplotlib.pyplot as plt matplotlib.rcParams['text.latex.preamble'] = r'\input{BigFatHeader.tex}' matplotlib.rcParams['text.usetex'] = True plt.plot([1,2]) plt.savefig('MWE.pdf') Where BigFatHeader.tex might be as simple as \usepackage{bm}

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