Strange location for a comma

[ast]

Hello, 

At the end of the last line of the following program,
there is a comma, I dont understand why ?

Thx


from cx_Freeze import setup, Executable

# On appelle la fonction setup
setup(
    name = "salut",
    version = "0.1",
    description = "Ce programme vous dit bonjour",
    executables = [Executable("salut.py")],    #  <--- HERE
)