filter pandas code example

Example 1: count nan pandas

#Python, pandas
#Count missing values for each column of the dataframe df

df.isnull().sum()

Example 2: filter dataframe with list

df[df['Your_Column'].isin([3, 6])]

Example 3: see all columns pandas

pd.set_option('max_columns', None)

Example 4: pandas filter dataframe

In [96]: df
Out[96]:
   A  B  C  D
a  1  4  9  1
b  4  5  0  2
c  5  5  1  0
d  1  3  9  6

In [99]: df[(df.A == 1) & (df.D == 6)]
Out[99]:
   A  B  C  D
d  1  3  9  6

Example 5: pandas column filter

filter = df['column']!= 0
df = df[filter]

Example 6: how to apply filters in pandas

# filter rows for year 2002 using  the boolean expression
>gapminder_2002 = gapminder[gapminder.year.eq(2002)]
>print(gapminder_2002.shape)
(142, 6)