group by aggregate pandas code example

Example 1: pandas groupby aggregate quantile

# 50th Percentile
def q50(x):
    return x.quantile(0.5)

# 90th Percentile
def q90(x):
    return x.quantile(0.9)

my_DataFrame.groupby(['AGGREGATE']).agg({'MY_COLUMN': [q50, q90, 'max']})

Example 2: how can i aggregate without group by in pandas

df.groupby(lambda _ : True).agg(new_col_name = ('col_name', 'agg_function'))