panda only show if location equals code example

Example 1: pandas lambda if else

df['equal_or_lower_than_4?'] = df['set_of_numbers'].apply(lambda x: 'True' if x <= 4 else 'False')

Example 2: make a condition statement on column pandas

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