Update exercises/variograms.py

exercises/variograms.py

@@ -6,7 +6,7 @@ import getpass
 # import pymysql
 import matplotlib.pyplot as plt
 from sqlalchemy import create_engine
-st.write(pd. __version__)
+
 def variogram(nugget=0.0, srange=100., struct_type='Spherical'):
   var = 1.-nugget
   h = np.arange(0,150.,5.)