Ren'Py reserves all names beginning with a single underscore (_). Do not use names beginning with an underscore, as that may cause your game to break in future versions of Ren'Py.
The following is a list of names that are used by Python. Re-using these names can lead to obscure problems.
The following is a list of names that are used by Ren'Py. While in some cases it makes to redefine these names, one should be aware that doing so can cause obscure problems.
AddToSet()AlphaBlend()AlphaDissolve()AlphaMask()AnimatedValue()At()AudioPositionValue()BarValueBorders()Call()Character()ColorComposeTransition()ConditionSwitch()Confirm()CropMove()DictInputValue()DictValue()DisableAllInputValues()Dissolve()DragDragGroupDynamicDisplayable()DynamicImage()EndReplay()Fade()FieldInputValue()FieldValue()FileAction()FileCurrentPage()FileCurrentScreenshot()FileDelete()FileJson()FileLoad()FileLoadable()FileNewest()FilePage()FilePageName()FilePageNameInputValue()FilePageNext()FilePagePrevious()FileSave()FileSaveName()FileScreenshot()FileSlotName()FileTakeScreenshot()FileTime()FileUsedSlots()Fixed()Flatten()FontGroup()Frame()Function()GalleryGamepadCalibrate()GamepadExists()Grid()HBox()Help()Hide()HideInterface()If()Image()ImageDissolve()InputValueInvertSelected()Jump()Language()LiveComposite()LiveCrop()LiveTile()MainMenu()MixerValue()MouseMove()MoveTransition()Movie()MultiPersistentMultipleTransition()MusicRoomNoRollbackNotify()Null()NullAction()OpenURL()ParameterizedText()Pause()PauseAudio()Pixellate()Placeholder()PlayCharacterVoice()Preference()PushMove()Queue()QueueEvent()QuickLoad()QuickSave()Quit()RemoveFromSet()Replay()RestartStatement()Return()RollForward()Rollback()RollbackToIdentifier()ScreenVariableInputValue()ScreenVariableValue()Screenshot()SelectedIf()SensitiveIf()SetCharacterVolume()SetDict()SetField()SetMixer()SetMute()SetScreenVariable()SetVariable()SetVoiceMute()Show()ShowMenu()ShowTransient()ShowingSwitch()SideImage()Skip()SnowBlossom()Solid()SpriteSpriteManagerStart()StaticValue()StyleStylePreference()Text()ToggleDict()ToggleField()ToggleMute()ToggleScreenVariable()ToggleSetMembership()ToggleVariable()ToggleVoiceMute()TooltipTransformVBox()VariableInputValue()VariableValue()VoiceReplay()With()XScrollValue()YScrollValue()advblindscenterdissolveeasefadehpunchirisinleftmain_menumenu()mouse_visiblemovemoveinrightmoveoutrightname_onlynarratoroffscreenleftoffscreenrightpixellatepushrightresetrightsave_namesayslideawayleftslideleftsquaressvtoplefttoprighttruecentervoice()voice_can_replay()voice_replay()voice_sustain()vpunchwipeleftzoominzoominoutzoomoutRen'Py reserves filenames beginning with an underscore or "00".