SyntaxError invalid syntax. I cant find the error can i get help?

import pandas as pd

import numpy as $np$

def chickenpox$\_$by$\_$sex$()$:

$df=$pan, read$\_$csv $("$filename$.$csv$",$ index$\_$clmn$=0)$

chickenpox$\_$sex$=$df$[$df$[\text{'}$P$\_$NUMVRC'$].$gt$(0)$ & df$[\text{'}$had$\_$chickenpox'$].$ It$(3).$ loc $[$: $,[\text{'}$had$\_$chickenpox', 'sex' $]]$

chickenpox$1\_$sex$1=$len $($chickenpox$\_$sex $[($chickenpox$\_$sex$[\text{'}$had$\_$chickenpox'$]==1)$ & $($chickenpox$\_$sex$[\text{'}$sex$\text{'}]==1)])$

chickenpox$1\_$sex$2=$len $($chickenpox$\_$sex$[($chickenpox$\_$sex$[\text{'}$had$\_$chickenpox'$]==1)$ & $($chickenpox$\_$sex$[\text{'}$sex$\text{'}]==2)])$

chickenpox$2\_$sex$1=$len$($chickenpox$\_$sex$[($chickenpox$\_$sex$[\text{'}$had$\_$chickenpox'$]==2)$ & $($chickenpox$\_$sex$[\text{'}$sex$\text{'}]==1)])$

chickenpox$2\_$sex$2=$len$($chickenpox$\_$sex$[($chickenpox$\_$sex$[\text{'}$had$\_$chickenpox'$]==2)$ & $($chickenpox$\_$sex$[\text{'}$sex$\text{'}]==2)])$

cbs male": $0,$ female": $0$