How to use the scons.scons-local-250.SCons.Action.CommandAction function in SCons

if isinstance(act, ActionBase):
        return act

    if is_String(act):
        var=SCons.Util.get_environment_var(act)
        if var:
            # This looks like a string that is purely an Environment
            # variable reference, like "$FOO" or "${FOO}".  We do
            # something special here...we lazily evaluate the contents
            # of that Environment variable, so a user could put something
            # like a function or a CommandGenerator in that variable
            # instead of a string.
            return LazyAction(var, kw)
        commands = str(act).split('\n')
        if len(commands) == 1:
            return CommandAction(commands[0], **kw)
        # The list of string commands may include a LazyAction, so we
        # reprocess them via _do_create_list_action.
        return _do_create_list_action(commands, kw)
    
    if is_List(act):
        return CommandAction(act, **kw)

    if callable(act):
        try:
            gen = kw['generator']
            del kw['generator']
        except KeyError:
            gen = 0
        if gen:
            action_type = CommandGeneratorAction
        else:

# This looks like a string that is purely an Environment
            # variable reference, like "$FOO" or "${FOO}".  We do
            # something special here...we lazily evaluate the contents
            # of that Environment variable, so a user could put something
            # like a function or a CommandGenerator in that variable
            # instead of a string.
            return LazyAction(var, kw)
        commands = str(act).split('\n')
        if len(commands) == 1:
            return CommandAction(commands[0], **kw)
        # The list of string commands may include a LazyAction, so we
        # reprocess them via _do_create_list_action.
        return _do_create_list_action(commands, kw)
    
    if is_List(act):
        return CommandAction(act, **kw)

    if callable(act):
        try:
            gen = kw['generator']
            del kw['generator']
        except KeyError:
            gen = 0
        if gen:
            action_type = CommandGeneratorAction
        else:
            action_type = FunctionAction
        return action_type(act, kw)

    # Catch a common error case with a nice message:
    if isinstance(act, int) or isinstance(act, float):
        raise TypeError("Don't know how to create an Action from a number (%s)"%act)

# This looks like a string that is purely an Environment
            # variable reference, like "$FOO" or "${FOO}".  We do
            # something special here...we lazily evaluate the contents
            # of that Environment variable, so a user could put something
            # like a function or a CommandGenerator in that variable
            # instead of a string.
            return LazyAction(var, kw)
        commands = str(act).split('\n')
        if len(commands) == 1:
            return CommandAction(commands[0], **kw)
        # The list of string commands may include a LazyAction, so we
        # reprocess them via _do_create_list_action.
        return _do_create_list_action(commands, kw)
    
    if is_List(act):
        return CommandAction(act, **kw)

    if callable(act):
        try:
            gen = kw['generator']
            del kw['generator']
        except KeyError:
            gen = 0
        if gen:
            action_type = CommandGeneratorAction
        else:
            action_type = FunctionAction
        return action_type(act, kw)

    # Catch a common error case with a nice message:
    if isinstance(act, int) or isinstance(act, float):
        raise TypeError("Don't know how to create an Action from a number (%s)"%act)

if isinstance(act, ActionBase):
        return act

    if is_String(act):
        var=SCons.Util.get_environment_var(act)
        if var:
            # This looks like a string that is purely an Environment
            # variable reference, like "$FOO" or "${FOO}".  We do
            # something special here...we lazily evaluate the contents
            # of that Environment variable, so a user could put something
            # like a function or a CommandGenerator in that variable
            # instead of a string.
            return LazyAction(var, kw)
        commands = str(act).split('\n')
        if len(commands) == 1:
            return CommandAction(commands[0], **kw)
        # The list of string commands may include a LazyAction, so we
        # reprocess them via _do_create_list_action.
        return _do_create_list_action(commands, kw)
    
    if is_List(act):
        return CommandAction(act, **kw)

    if callable(act):
        try:
            gen = kw['generator']
            del kw['generator']
        except KeyError:
            gen = 0
        if gen:
            action_type = CommandGeneratorAction
        else:

def __init__(self, var, kw):
        if SCons.Debug.track_instances: logInstanceCreation(self, 'Action.LazyAction')
        CommandAction.__init__(self, '${'+var+'}', **kw)
        self.var = SCons.Util.to_String(var)
        self.gen_kw = kw

def get_parent_class(self, env):
        c = env.get(self.var)
        if is_String(c) and not '\n' in c:
            return CommandAction
        return CommandGeneratorAction

def get_parent_class(self, env):
        c = env.get(self.var)
        if is_String(c) and not '\n' in c:
            return CommandAction
        return CommandGeneratorAction