def print$\_$list$($lst$)$:

print$(\text{'},\text{'}.$join$($lst$))$

# $2$

def start$\_$with$\_$count$($lst$,$ char$)$:

return sum$(1$ for item in lst if item.startswith$($char$))$

# $3$

def double$\_$list$($lst$)$:

doubled$\_$list $=[]$

for car in lst:

doubled$\_$list.extend$([$car$,$ car$])$

return doubled$\_$list

# $4$

def print$\_$reversed$($lst$)$:

reversed$\_$list $=[]$

for i in range$($len$($lst$)-1,-1,-1)$:

reversed$\_$list.append$($lst$[$i$])$

print$($reversed$\_$list$)$

# $5$

def rotate$\_$list$($lst$)$:

rotated $=$ lst$[1$:$]+[$lst$[0]]$

return rotated

# $6$

def cal$\_$avg$($lst$)$:

total$\_$length $=$ sum$($len$($item$)$ for item in lst$)$

return total$\_$length $/$ len$($lst$)$

if $\_\_$name$\_\_=="\_\_$main$\_\_"$:

car$\_$list $=[\text{'}$Chevrolet$\text{'},$ 'Cadillac', 'Buick', $\text{'}$GMC$\text{'},$ 'Ford', 'Jeep', 'Dodge', 'Tesla', 'Austin'$]$

print$(\text{'}$Here is the list:$\text{'})$

print$\_$list$($car$\_$list$)$

print$(\text{'}$The number of cars start with C is:$\text{'},$ start$\_$with$\_$count$($car$\_$list, $\text{'}$C$\text{'}))$

print$(\text{'}$The list doubled: $\text{'})$

print$($double$\_$list$($car$\_$list$))$

print$(\text{'}$The list reversed:$\text{'})$

print$\_$reversed$($car$\_$list$)$

print$(\text{'}$The list after a right rotate:$\text{'})$

print$($rotate$\_$list$($car$\_$list$))$

print$(\text{'}$The average length of the list items is: $\%\mathrm{.}2$f$\text{'}\%$ cal$\_$avg$($car$\_$list$))$