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There seems to be an issue with adding tex symbols in matplotlib after import pyOPAL. The simple code snippet below

from matplotlib import rc
from opal.opal import load_dataset
import matplotlib.pyplot as plt

FontSize=22
FontSizeLabelAxis=22
rc('xtick',labelsize=FontSize)
rc('ytick',labelsize=FontSize)
rc('text', usetex=True)

x=np.linspace(-10,10,100)
plt.plot (x,x**2)
plt.xlabel (r'$x$ ')

give the error

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-4-11cccf49f543> in <module>
     14 x=np.linspace(-10,10,100)
     15 plt.plot (x,x**2)
---> 16 plt.xlabel (r'$x$ ')

/usr/lib64/python3.9/site-packages/matplotlib/pyplot.py in xlabel(xlabel, fontdict, labelpad, loc, **kwargs)
   3113 @_copy_docstring_and_deprecators(Axes.set_xlabel)
   3114 def xlabel(xlabel, fontdict=None, labelpad=None, *, loc=None, **kwargs):
-> 3115     return gca().set_xlabel(
   3116         xlabel, fontdict=fontdict, labelpad=labelpad, loc=loc,
   3117         **kwargs)

/usr/lib64/python3.9/site-packages/matplotlib/axes/_axes.py in set_xlabel(self, xlabel, fontdict, labelpad, loc, **kwargs)
    245         elif loc == 'right':
    246             kwargs.update(x=1, horizontalalignment='right')
--> 247         return self.xaxis.set_label_text(xlabel, fontdict, **kwargs)
    248 
    249     def get_ylabel(self):

/usr/local/lib/python3.9/site-packages/opal-1.0.0-py3.9.egg/opal/utilities/wrapper.py in run(*args, **kwargs)
     35     @functools.wraps(fun)
     36     def run(*args, **kwargs):
---> 37         return new_fun(fun, *args, **kwargs)
     38     return run
     39 

/usr/local/lib/python3.9/site-packages/opal-1.0.0-py3.9.egg/opal/utilities/wrapper.py in new_label(fun, *args, **kwargs)
     67         # we need to add the signs otherwise LaTex formulas
     68         # are not properly compiled
---> 69         re._alphanum_str = re._alphanum_str.union(signs)
     70         lst[idx] = re.escape(lst[idx])
     71         # remove signs again

AttributeError: module 're' has no attribute '_alphanum_str'