How to use the moltemplate.ttree.WriteVarBindingsFile function in moltemplate

# (with the original variable names present)
        WriteFiles(files_content, suffix=".template", write_to_stdout=False)

        # Write the files with the variables substituted by values
        sys.stderr.write(' done\nbuilding and rendering templates...')
        files_content = defaultdict(list)
        ExecCommands(g_static_commands, files_content, settings, True)
        ExecCommands(g_instance_commands, files_content, settings, True)
        sys.stderr.write(' done\nwriting rendered templates...\n')
        WriteFiles(files_content)

        # Now write the variable bindings/assignments table.
        sys.stderr.write('writing \"ttree_assignments.txt\" file...')
        open('ttree_assignments.txt', 'w').close() # <-- erase previous version.
        WriteVarBindingsFile(g_objectdefs)
        WriteVarBindingsFile(g_objects)
        sys.stderr.write(' done\n')

    except (ValueError, InputError) as err:
        sys.stderr.write('\n\n'+str(err)+'\n')
        sys.exit(-1)

# Write the files with the variables substituted by values
        sys.stderr.write(' done\nbuilding and rendering templates...')
        files_content = defaultdict(list)
        ExecCommands(g_static_commands, files_content, settings, True)
        ExecCommands(g_instance_commands, files_content, settings, True)
        sys.stderr.write(' done\nwriting rendered templates...\n')
        WriteFiles(files_content)
        sys.stderr.write(' done\n')

        # Now write the variable bindings/assignments table.
        sys.stderr.write('writing \"ttree_assignments.txt\" file...')
        # <-- erase previous version.
        open('ttree_assignments.txt', 'w').close()
        WriteVarBindingsFile(g_objectdefs)
        WriteVarBindingsFile(g_objects)
        sys.stderr.write(' done\n')

    except (ValueError, InputError) as err:
        if isinstance(err, ValueError):
            sys.stderr.write('Error converting string to numeric format.\n'
                             '      This sometimes means you have neglected to specify the atom style\n'
                             '      (using the \"-atomstyle\" command).  Alternatively it could indicate\n'
                             '      that the moltemplate file contains non-numeric text in one of the\n'
                             '      .move(), .rot(), .scale() commands.  If neither of these scenarios\n'
                             '      apply, then please report this bug. (jewett.aij at gmail dot com)\n')
            sys.exit(-1)
        else:
            sys.stderr.write('\n\n' + str(err) + '\n')
            sys.exit(-1)

    return

WriteFiles(files_content, suffix=".template", write_to_stdout=False)

        # Write the files with the variables substituted by values
        sys.stderr.write(' done\nbuilding and rendering templates...')
        files_content = defaultdict(list)
        ExecCommands(g_static_commands, files_content, settings, True)
        ExecCommands(g_instance_commands, files_content, settings, True)
        sys.stderr.write(' done\nwriting rendered templates...\n')
        WriteFiles(files_content)
        sys.stderr.write(' done\n')

        # Now write the variable bindings/assignments table.
        sys.stderr.write('writing \"ttree_assignments.txt\" file...')
        # <-- erase previous version.
        open('ttree_assignments.txt', 'w').close()
        WriteVarBindingsFile(g_objectdefs)
        WriteVarBindingsFile(g_objects)
        sys.stderr.write(' done\n')

    except (ValueError, InputError) as err:
        if isinstance(err, ValueError):
            sys.stderr.write('Error converting string to numeric format.\n'
                             '      This sometimes means you have neglected to specify the atom style\n'
                             '      (using the \"-atomstyle\" command).  Alternatively it could indicate\n'
                             '      that the moltemplate file contains non-numeric text in one of the\n'
                             '      .move(), .rot(), .scale() commands.  If neither of these scenarios\n'
                             '      apply, then please report this bug. (jewett.aij at gmail dot com)\n')
            sys.exit(-1)
        else:
            sys.stderr.write('\n\n' + str(err) + '\n')
            sys.exit(-1)

# Write the files as templates 
        # (with the original variable names present)
        WriteFiles(files_content, suffix=".template", write_to_stdout=False)

        # Write the files with the variables substituted by values
        sys.stderr.write(' done\nbuilding and rendering templates...')
        files_content = defaultdict(list)
        ExecCommands(g_static_commands, files_content, settings, True)
        ExecCommands(g_instance_commands, files_content, settings, True)
        sys.stderr.write(' done\nwriting rendered templates...\n')
        WriteFiles(files_content)

        # Now write the variable bindings/assignments table.
        sys.stderr.write('writing \"ttree_assignments.txt\" file...')
        open('ttree_assignments.txt', 'w').close() # <-- erase previous version.
        WriteVarBindingsFile(g_objectdefs)
        WriteVarBindingsFile(g_objects)
        sys.stderr.write(' done\n')

    except (ValueError, InputError) as err:
        sys.stderr.write('\n\n'+str(err)+'\n')
        sys.exit(-1)