please help on this $,$am getting an syntax error$-$ clfs $=[]$

for ccp$\_$alpha in ccp$\_$alphas:

clf $=$ DecisionTreeClassifier$($

random$\_$state$=1,$ ccp$\_$alpha$=$ccp$\_$alpha, class$\_$weight$=$"balanced"

$)$

clf$.$fit$($X$\_$train, y$\_$train$)2$

clfs$.$append$($clf$)$

print$($

"Number of nodes in the last tree is: $\{\}$ with ccp$\_$alpha: $\{\}".$format$($

clfs$[-1].$tree$\_.$node$\_$count, ccp$\_$alphas$[-1]$

$)$

$)$