select only rows that have criteria pandas code example
Example 1: or condition in pandas
df1 = df[(df.a != -1) & (df.b != -1)]
Example 2: filter df by column value
# does year equals to 2002?
# is_2002 is a boolean variable with True or False in it
>is_2002 = gapminder['year']==2002
>print(is_2002.head())
0 False
1 False
2 False
3 False
4 False