Program in Python that draws a fractal tree using the turtle module

This program uses recursion to draw the fractal tree. The draw_tree function takes a turtle object t and a branch length branch_len as arguments. It first checks if the branch length is greater than 5, which serves as the base case for the recursion. If it is, it moves the turtle forward by branch_len, turns right by 20 degrees, calls draw_tree recursively with a branch length of branch_len-15 (to create the smaller branches on the right), turns left by 40 degrees, calls draw_tree recursively with a branch length of branch_len-15 again (to create the smaller branches on the left), turns right by 20 degrees, and moves the turtle backward by branch_len to return to the starting point.
In the main function, a turtle object is created and initialized, and the draw_tree function is called with a branch length of 75 to draw the full fractal tree. The turtle window is kept open until the user clicks on it.