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import qeds
qeds.themes.mpl_style();

---------------------------------------------------------------------------
RecursionError                            Traceback (most recent call last)
<ipython-input-16-72b73e412c56> in <module>()
      5 # activate plot theme
      6 import qeds
----> 7 qeds.themes.mpl_style();

1 frames
/usr/local/lib/python3.6/dist-packages/qeds/themes.py in mpl_style()
     49     rcp['axes.labelsize'] = 'large'
     50 
---> 51     plt.style.library["qeds"] = mpl_style()
     52     plt.style.reload_library()
     53     plt.style.use("qeds")

... last 1 frames repeated, from the frame below ...

/usr/local/lib/python3.6/dist-packages/qeds/themes.py in mpl_style()
     49     rcp['axes.labelsize'] = 'large'
     50 
---> 51     plt.style.library["qeds"] = mpl_style()
     52     plt.style.reload_library()
     53     plt.style.use("qeds")

RecursionError: maximum recursion depth exceeded in comparison

import pandas as pd
import numpy as np

df = pd.DataFrame({'x': [1, 2, np.nan, 3, 4]})

df

output:
    x
0  1.0
1  2.0
2  NaN
3  3.0
4  4.0


df.pct_change()

output:
          x
0       NaN
1  1.000000
2  0.000000
3  0.500000
4  0.333333

df.pct_change(fill_method=None)

output:
          x
0       NaN
1  1.000000
2       NaN
3       NaN
4  0.333333