what is the correct syntax for this code?

import tkinter as tk

def main$()$:

window$=$ tk$.$Tk$()$

window.title$("$Miles Converter"$)$

window.geometry$("350$x$250")$

# create instruction label

label $=$ tk$.$Label$($window$,$ text$=$"Enter the number of miles below. $")$

# place label in window at position x$,$y

label.place$($x$=10,$y$=10)$

# create Miles label

label$1=$ tk$.$Label$($window$,$ text$=$"Miles $")$

# place label$1$ in window at position x$,$y

label$1.$place$($x$=50,$y$=70)$

# create Kilometers label

label$2=$ tk$.$Label$($window$,$ text$=$"Kilometers $")$

# place label$2$ in window at position x$,$y

label$2.$place$($x$=50,$y$=100)$

# create a text box

textbox$1=$ tk$.$Entry$($window$,$ width$=12)$

# place textbox$1$ in window at position x$,$y

textbox$1.$place$($x$=200,$y$=70)$

# create a label$3$ with empty text:

label$3=$ tk$.$Label$($window$,$ text$="")$

# place label$3$ in window at position x$,$y

label$3.$place$($x$=200,$y$=100$

def btn$1\_$click$()$:

kilometers $=$ round$(($float$($textbox$1.$get$())*1\mathrm{.}60934),2)$

label$3.$configure$($text $=$ str$($kilometers$)+\text{'}$ Kilometers'$)$

# create a button with text Button $1$

btn$1=$ tk$.$Button$($window$,$ text$=$"Compute", command $=$ btn$1\_$click$)$

# place this button in window at position x$,$y

btn$1.$place$($x$=150,$y$=150)$

window.mainloop$()$

main$()$