How do I link these two files together $```$

def main$()$:

# Creating the inventory dictionary

book$\_$inventory $=\{$

"William Shakespear": $[$

$\{"$book name": "Hamlet", "year pub": $1601,$ "price": $14\mathrm{.}52,$ "quantity": $43\},$

$\{"$book name": "Macbeth", "year pub": $1606,$ "price": $13\mathrm{.}45,$ "quantity": $50\},$

$\{"$book name": "Othello", "year pub": $1604,$ "price": $15\mathrm{.}30,$ "quantity": $37\},$

$\{"$book name": "Romeo and Juliet", "year pub": $1597,$ "price": $12\mathrm{.}99,$ "quantity": $60\}$

$],$

"Charles Dickens": $[$

$\{"$book name": "A Tale of Two Cities", "year pub": $1859,$ "price": $9\mathrm{.}56,$ "quantity": $75\},$

$\{"$book name": "Great Expectations", "year pub": $1861,$ "price": $12\mathrm{.}50,$ "quantity": $60\},$

$\{"$book name": "Oliver Twist", "year pub": $1837,$ "price": $9\mathrm{.}75,$ "quantity": $50\},$

$\{"$book name": "David Copperfield", "year pub": $1850,$ "price": $11\mathrm{.}25,$ "quantity": $48\}$

$],$

"James Joyce": $[$

$\{"$book name": "Ulysses", "year pub": $1922,$ "price": $19\mathrm{.}99,$ "quantity": $30\},$

$\{"$book name": "A Portrait of the Artist as a Young Man", "year pub": $1916,$ "price": $13\mathrm{.}20,$ "quantity": $25\},$

$\{"$book name": "Dubliners", "year pub": $1914,$ "price": $12\mathrm{.}00,$ "quantity": $35\},$

$\{"$book name": "Finnegans Wake", "year pub": $1939,$ "price": $20\mathrm{.}10,$ "quantity": $20\}$

$],$

"Ernest Hemingway": $[$

$\{"$book name": "The Old Man and the Sea", "year pub": $1952,$ "price": $10\mathrm{.}35,$ "quantity": $80\},$

$\{"$book name": "A Farewell to Arms", "year pub": $1929,$ "price": $14\mathrm{.}75,$ "quantity": $45\},$

$\{"$book name": "For Whom the Bell Tolls", "year pub": $1940,$ "price": $13\mathrm{.}50,$ "quantity": $50\},$

$\{"$book name": "The Sun Also Rises", "year pub": $1926,$ "price": $12\mathrm{.}99,$ "quantity": $55\}$

$],$

$"$J$.$K$.$ Rowling": $[$

$\{"$book name": "Harry Potter and the Philosopher's Stone", "year pub": $1997,$ "price": $16\mathrm{.}62,$ "quantity": $100\},$

$\{"$book name": "Harry Potter and the Chamber of Secrets", "year pub": $1998,$ "price": $22\mathrm{.}99,$ "quantity": $90\},$

$\{"$book name": "Harry Potter and the Prisoner of Azkaban", "year pub": $1999,$ "price": $23\mathrm{.}99,$ "quantity": $85\},$

$\{"$book name": "Harry Potter and the Goblet of Fire", "year pub": $2000,$ "price": $25\mathrm{.}99,$ "quantity": $80\}$

$]$

$\}$

$``````$

# Function to check inventory

def check$\_$inventory$()$:

print$("$Book Inventory"$)$

print$("-"*40)$

for author, books in book$\_$inventory.items$()$:

print$($f$"$Author: $\{$author$\}")$

for book in books:

print$($f$"$ Book: $\{$book$[\text{'}$book name'$]\}")$

print$($f$"$ Year Published: $\{$book$[\text{'}$year pub'$]\}")$

print$($f$"$ Price: $$\{$book$[\text{'}$price$\text{'}]$:$\mathrm{.}2$f$\}")$

print$($f$"$ Quantity: $\{$book$[\text{'}$quantity$\text{'}]\}\text{'})$

print$("-"*40)$

# Function to calculate total inventory value

def calculate$\_$total$\_$value$()$:

total$\_$value $=0$

for books in book$\_$inventory.values$()$:

for book in books:

total$\_$value $+=$ book$["$price$"]*$ book$["$quantity$"]$

print$($f$"$Total inventory value: $$\{$total$\_$value:$\mathrm{.}2$f$\}")$

# Main program menu

while True:

print$("1.$ Check Inventory"$)$

print$("2.$ Calculate Total Value"$)$

print$("3.$ Exit"$)$

choice $=$ input$("$Enter your choice: $")$

if choice $=="1"$:

check$\_$inventory$()$

elif choice $=="2"$:

calculate$\_$total$\_$value$()$

elif choice $=="3"$:

print$("$Exiting program."$)$

break

else:

print$("$Invalid choice. Please try again."$)$

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

main$()$

$```$