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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def main():
 """ The entry point for this module """

    # first, check we can import aeneas package, exiting on failure
    if check_import():
        sys.exit(1)

    # import and run the built-in diagnostics
    from aeneas.diagnostics import Diagnostics
    errors, warnings, c_ext_warnings = Diagnostics.check_all()
    if errors:
        sys.exit(1)
    if c_ext_warnings:
        print_warning(u"All required dependencies are met but at least one Python C extension is not available")
        print_warning(u"You can still run aeneas but it will be slower")
        print_warning(u"Enjoy running aeneas!")
        sys.exit(2)
    else:
        print_success(u"All required dependencies are met and all available Python C extensions are working")
        print_success(u"Enjoy running aeneas!")
        sys.exit(0)