how to filter columns by name in pandas code example

Example 1: 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 2: pandas column filter

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

Example 3: pandas filter

df[(df['year'] > 2012) & (df['reports'] < 30)]

Example 4: pandas filter

#To select rows whose column value is in list 
years = [1952, 2007]
gapminder.year.isin(years)