Web Reference: Aug 12, 2013 · It may happen when you have file name matplotlib.py in your working directory. In python3, a separate installation of matplotlib using python3 -m pip install matplotlib solved the error. Aug 8, 2025 · The issue is easy: Python cannot find the matplotlib library in your system. This happens when matplotlib isn’t installed, or Python is looking for it in the wrong place. Let’s get in! The easy solution is to install matplotlib using pip, Python’s package installer. This method works in 90% of cases I’ve encountered. Here’s how to do it: Plot y versus x as lines and/or markers with attached errorbars. x, y define the data locations, xerr, yerr define the errorbar sizes. By default, this draws the data markers/lines as well as the errorbars. Use fmt='none' to draw errorbars without any data markers.
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