Hi$,$ basically I need some help in tweaking my work since I keep getting an error. To give some context, the question is as follows:

"Make use of the merged data to complete the function $`$make$\_$bar$\_$chart$`$ below. The elements requested by the management team for the first visualization are:

$*$ Make $4$ plots, each of which is a bar chart representing the total visitation $($as y$-$axis$)$ of each state $($shown in x$-$axis$)$ in year $2016,2017,2018$ and $2019.$ Each plot should use the data for each year.

$*$ Make the figures readable by adjusting the figure size, and specify the year of each plot using the title $($e$.$g$.,$ A proper title of the plot using $2016$ visitation data could be something like $$Visitation data $2016.)$

$*$ For each plot, place two markers $($style of your choice$)$: one above the bar with the highest visitation and one above the bar with the lowest visitation."

def make$\_$bar$\_$chart$($data$)$:

df $=$ pd$.$DataFrame$($data$)$

df$.$set$\_$index$(\text{'}$state$\text{'},$ inplace$=$True$)$

#Define function for annotating lowest to highest:

def annotate$\_$df$($ax$,$df$)$:

max$\_$value $=$ df$.$max$()$

min$\_$value $=$ df$.$min$()$

#identifying the max & min:

max$\_$index $=$ df$.$idmax$()$

min$\_$index $=$ df$.$idmin$()$

# for loop to itterate through the df$($each year$)$:

for index, value in data.items$()$:

#set condition for max & min:

#$1)$ identified max & min will have arrow pointed

#$2)$ Make sure that arrow is placed above the bar

if value $==$ max$\_$value:

ax$.$annotate$($f$\text{'}$Max: $\{$max$\_$value$\}\text{'},$ xy $=($index$,$ value$),$ xytext $=($index$,$ value$+100),$

arrowprops$=$dict$($facecolor$=$'black', arrowstyle$=\text{'}->\text{'}),$

horizontalalignment $=$'center', verticalalignment$=$'bottom'$)$

elif value $==$ min$\_$value:

ax$.$annotate$($f$\text{'}$Min: $\{$min$\_$value$\}\text{'},$ xy$=($index$,$ value$),$ xytext$=($index$,$ value $+100),$

arroeprops$=$dict$($facecolor$=$'black', arrowstyle$=\text{'}->\text{'}),$

horizontalalignment$=$'center', verticalalignment$=$'bottom'$)$

#To plot each year's data:

fig, axs $=$ plt$.$subplots$(2,2,$ figsize$=(12,10))$

#Define years & colors:

visitation$\_$years $=[\text{'}$visitation$\_2016\text{'},$ 'visitation$\_2017\text{'},$ 'visitation$\_2018\text{'},$ 'visitation$\_2019\text{'}]$

colors $=[\text{'}$lightgreen$\text{'},$ 'salmon', 'gold', 'skyblue'$]$

#to set up itterate through the df:

for x$,$ year in enumerate$($visitation$\_$years$)$:

row $=$ x$//2$

col $=$ x$\%2$

ax $=$ axs$[$row$,$ col$]$

ax$.$bar$($df$.$index, df$[$year$],$ color $=$ colors$[$x$])$

ax$.$set$\_$title$($f$\text{'}$Visitation data $\{$year$\}\text{'})$

annotate$\_$df$($ax$,$ df$[$year$])$

plt$.$show$()$

#return

make$\_$bar$\_$chart$($load$\_$data$())$