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from __future__ import print_function
import sys
msg = "\nThe matplotlib python module is missing or not installed properly.\n"
msg += "Is the PYTHONPATH environment variable set correctly?\n"
msg += "Please verify your installation by running on the command line:\n"
msg += "python -c 'import matplotlib'\n"
msg += "\n"
msg += "This module is optional and required in order to use "
msg += "ASE's simple GUI.\n"
msg += "If you don't wish to use ASE's GUI ignore this error, otherwise\n"
msg += "please install the package using "
msg += "your distribution package manager, i.e.:\n"
msg += "\n"
msg += " Debian/Ubuntu: sudo apt-get python-matplotlib\n"
msg += "\n"
msg += " OpenSUSE: yast -i python-matplotlib\n"
msg += "\n"
msg += " Red Hat/Fedora: yum install python-matplotlib\n"
msg += "\n"
msg += "or perform manual installation, preferably as non-root user,\n"
msg += "following http://matplotlib.sourceforge.net/users/installing.html."
if locals().get('display'):
try:
import matplotlib
matplotlib # silence pyflakes
except ImportError:
print(msg, file=sys.stderr)
raise
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