how to find a specific value in df based on row and column code example

Example 1: fetch row where column is equal to a value pandas

df.loc[df['column_name'] == 'value']

Example 2: panda select rows where column value inferior to

df.loc[df['column_name'] == some_value]

Example 3: only keep rows of a dataframe based on a column value

df.loc[(df['column_name'] >= A) & (df['column_name'] <= B)]