pandas select columns where condition code example

Example 1: or condition in pandas

df1 = df[(df.a != -1) & (df.b != -1)]

Example 2: make a condition statement on column pandas

df['color'] = ['red' if x == 'Z' else 'green' for x in df['Set']]

Example 3: make a condition statement on column pandas

df.loc[df['column name'] condition, 'new column name'] = 'value if condition is met'