filter column values in pandas code example

Example 1: filter data in a dataframe python on a if condition of a value python by Testy Toucan on May 22 2020 Donate

# filter rows in a dataframe by a condition on a column

df_filtered = df.loc[df['column'] == value]

Example 2: python - show repeted values in a column

df = df[df.duplicated(subset=['val1','val2'], keep=False)]

Example 3: pandas filter rows by value in list

df.loc[df['col name'].isin(ls_conditions)]

Example 4: filter a column in pandas by list of values

In [1]: df = pd.DataFrame({'A': [5,6,3,4], 'B': [1,2,3,5]})

In [2]: df
Out[2]:
   A  B
0  5  1
1  6  2
2  3  3
3  4  5

In [3]: df[df['A'].isin([3, 6])]
Out[3]:
   A  B
1  6  2
2  3  3

Example 5: unique values in dataframe column

#List unique values in the df['name'] column
df.name.unique()

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)