label error

$32$ ###generate labels

$--->33$ train$\_$df$[\text{'}$label$\text{'}].$replace$(["$ham$",$"spam"$],[0\mathrm{.}1],$ inplace$=$True$)$

$34$ train$\_$df$.$head$()$

$35$ test$\_$df$[\text{'}$label$\text{'}].$replace$(["$ham$",$"spam"$],[0,1],$ inplace$=$True$)$

$36$ test$\_$df$.$head$()$

~$\backslash$miniconda$3\backslash$Lib$\backslash$site$-$packages$\backslash$pandas$\backslash$core$\backslash$generic$.$py in $?($self$,$ to$\_$replace, value, inplace, limit$,$ regex, method$)$

$8091$ value $=[$value$]*$ len$($to$\_$replace$)$

$8092$

$8093$ # e$.$g$.$ we have to$\_$replace $=[$NA$,\text{'}\text{'}]$ and value $=[0,$ 'missing'$]$

$8094$ if len$($to$\_$replace$)!=$ len$($value$)$:

$->8095$ raise ValueError$($

$8096$ f$"$Replacement lists must match in length. $"$

$8097$ f$"$Expecting $\{$len$($to$\_$replace$)\}$ got $\{$len$($value$)\}"$

$8098)$

ValueError: Replacement lists must match in length. Expecting $2$ got $1$

How to fix?