replace nan in pandas
df['DataFrame Column'] = df['DataFrame Column'].fillna(0)
                                
                            replace nan in pandas
df['DataFrame Column'] = df['DataFrame Column'].fillna(0)
                                
                            python dataframe replace nan with 0
In [7]: df
Out[7]: 
          0         1
0       NaN       NaN
1 -0.494375  0.570994
2       NaN       NaN
3  1.876360 -0.229738
4       NaN       NaN
In [8]: df.fillna(0)
Out[8]: 
          0         1
0  0.000000  0.000000
1 -0.494375  0.570994
2  0.000000  0.000000
3  1.876360 -0.229738
4  0.000000  0.000000
                                
                            pandas where retuning NaN
# Try using a loc instead of a where:
df_sub = df.loc[df.yourcolumn == 'yourvalue']
                                
                            represent NaN with pandas in python
import pandas as pd
if pd.isnull(float("Nan")):
  print("Null Value.")
                                
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