Python - Script to measure block performance (Time = Tempo)

 #Script de Tempo Begin

from datetime import datetime

from dateutil.relativedelta import relativedelta

def diff(t_a, t_b):

    t_diff = relativedelta(t_b, t_a)  # later/end time comes first!

    return '{h}h {m}m {s}s'.format(h=t_diff.hours, m=t_diff.minutes, s=t_diff.seconds)

t_a = datetime.now()

 #Processo a medir

df = pd.read_sql_query(""" SELECT * from ErrorLog """ , cnxn)

#Script de Tempo End

t_b = datetime.now()

diff(t_a,t_b)

print("Time End: ",diff(t_a,t_b))