conte nan panda
#Python, pandas
#Count missing values for each column of the dataframe df
df.isnull().sum()
dataframe trova righe nan
df[df.isnull().any(axis=1)]
conteggio df valori mancanti
In [5]: df = pd.DataFrame({'a':[1,2,np.nan], 'b':[np.nan,1,np.nan]})
In [6]: df.isna().sum()
Out[6]:
a 1
b 2
dtype: int64
trova i valori nan in una colonna panda
df.isnull().values.any()
trova posizione di nan panda
# position of NaN values in terms of index
df.loc[pandas.isna(df["b"]), :].index
# position of NaN values in terms of rows that cotnain NaN
df.loc[pandas.isna(df["b"]), :]