# what is scripted expression syntax **URL:** \ **Category:** Python Support\ **Created:** [December 8, 2011, 2:36am UTC](https://blenderartists.org/t/what-is-scripted-expression-syntax/526624 "2011-12-08T02:36:14Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![huggaida](https://blenderartists.org/user_avatar/blenderartists.org/huggaida/32/17705_2.png) [@huggaida](https://blenderartists.org/u/huggaida)\ **Post date:** [December 8, 2011, 2:36am UTC](https://blenderartists.org/t/what-is-scripted-expression-syntax/526624/1 "2011-12-08T02:36:14Z")
So i want to use drivers with option “scripted expression”? for example typing “frame” in var field gives me my propertie equal current frame. If i want for example cube1 locX be equal cube2 rotZ? what is syntaxis. I tryed wiki’s : _math.pi \* 2 + 5.0_ Blender.Get(“curframe”) # the current animation frame math.sin(Blender.Get(“curframe”)) # the sine of the current frame self.LocX \* 10 but non of this dos not work for me with 2.6 Please help! ---
**Author:** ![test-dr](https://blenderartists.org/letter_avatar_proxy/v4/letter/t/d07c76/32.png) [@test-dr](https://blenderartists.org/u/test-dr)\ **Post date:** [December 8, 2011, 4:47am UTC](https://blenderartists.org/t/what-is-scripted-expression-syntax/526624/2 "2011-12-08T04:47:14Z")
> [@huggaida"](#): > > So i want to use drivers with option “scripted expression”? for example typing “frame” in var field gives me my propertie equal current frame. If i want for example cube1 locX be equal cube2 rotZ? what is syntaxis. I tryed wiki’s : > > _math.pi \* 2 + 5.0_ > > > > Blender.Get(“curframe”) # the current animation frame > > math.sin(Blender.Get(“curframe”)) # the sine of the current frame > > _self.LocX \* 10_ > > but non of this dos not work for me with 2.6 > Please help! to set cube1 locx to the rotation of cube2 rotZ enter for the driver of cube1-locx (insert a single-driver … switch to fcurves-\>drivers) a variable (±sign) and select as object: cube2 and as part the transform: rotation-Z-axis (check you have the right rotation-mode … XYZ-Euler … and not quaternions…) then enter into the expression field: var press return, maybe enable debug to view the current values … … you know the rotations are in radians …? for conversion to degrees, just use var\*360/pi ---
**Author:** ![batFINGER](https://blenderartists.org/user_avatar/blenderartists.org/batfinger/32/5981_2.png) [@batFINGER](https://blenderartists.org/u/batFINGER)\ **Post date:** [December 8, 2011, 7:29am UTC](https://blenderartists.org/t/what-is-scripted-expression-syntax/526624/3 "2011-12-08T07:29:44Z")
frame was only a recent and handy addition. For math.sin(Blender.Get(“curframe”)) # the sine of the current frame you can type #sin(frame) straight into the property as shown here. > **[GSoC11 - An easy way to create expressions...](http://aligorith.blogspot.nl/2011/07/gsoc11-easy-way-to-create-expressions.html)** > > In case you missed my commit the other day , I've recently committed a new feature which makes it easier to set up "expressions". Exp... Using driver variables in expressions > **[Driver "Variables" - Why they exist](http://aligorith.blogspot.nl/2011/09/driver-variables-why-they-exist.html)** > > I'm aware that there has been a bit of angst among some users of the driver system in 2.5 over the need to define "variables" for drivers to... custom functions for driver expressions. > **[\[Rigging FAQ\] Addedum Info on Drivers System](http://aligorith.blogspot.nl/2011/01/rigging-faq-addedum-info-on-drivers.html)** > > Re-reading my earlier post on the Drivers system , I realised that I overlooked mentioning a few things that I had intended to mention. Also... explanation of transform space > **[GSoC11 - "Local Space" for Transform Channel Drivers Rebooted](http://aligorith.blogspot.nl/2011/06/gsoc11-local-space-for-transform.html)** > > After much lobbying (in the form of countless bug reports and feature requests all over the place), I've taken a second look at the situatio... run down of the driver system (some features have changed) > **[\[Rigging FAQ\] Basics of the New Driver System in 2.5](http://aligorith.blogspot.nl/2010/09/rigging-faq-basics-of-new-driver-system.html)** > > Monitoring bug reports over the past while, I have noticed that there appear to be some misconceptions about the Driver system in 2.5. As us... test-dr… whoops mate… 2pi radians = 360 degrees… anyway why not use the maths functions radians(deg) or degrees(rad) ---
**Author:** ![test-dr](https://blenderartists.org/letter_avatar_proxy/v4/letter/t/d07c76/32.png) [@test-dr](https://blenderartists.org/u/test-dr)\ **Post date:** [December 8, 2011, 10:02am UTC](https://blenderartists.org/t/what-is-scripted-expression-syntax/526624/4 "2011-12-08T10:02:35Z")
> [@batFINGER](#): > > frame was only a recent and handy addition. For > > math.sin(Blender.Get(“curframe”)) # the sine of the current frame > … > … > > test-dr… whoops mate… 2pi radians = 360 degrees… anyway why not use the maths functions > > radians(deg) > > or > > degrees(rad) lol, yep! batFINGER, you are totally righty right. I have some braindamage from my setting for the cyclic wobbling of some very important body-parts - and those body-parts dont wobble/jiggle in the full cycle of one walk-animation/run-animation, they have only half of the cycle of the base-animation. ---
**Author:** ![huggaida](https://blenderartists.org/user_avatar/blenderartists.org/huggaida/32/17705_2.png) [@huggaida](https://blenderartists.org/u/huggaida)\ **Post date:** [December 8, 2011, 8:41pm UTC](https://blenderartists.org/t/what-is-scripted-expression-syntax/526624/5 "2011-12-08T20:41:52Z")
thank’s a lot. Amazing functionality!!! ---
**Author:** ![wigglyboots](https://blenderartists.org/letter_avatar_proxy/v4/letter/w/d2c977/32.png) [@wigglyboots](https://blenderartists.org/u/wigglyboots)\ **Post date:** [February 12, 2012, 2:54pm UTC](https://blenderartists.org/t/what-is-scripted-expression-syntax/526624/6 "2012-02-12T14:54:31Z")
I understand how to set up scripted expressions using the gui, but how exactly do you set a Scripted Expression using python? Edit: Ah, I figured it out. For anyone else wondering, this is how you set a driver’s expression with python, assuming you are setting the very first driver element in the driver list: ```auto bpy.data.objects['rig'].animation_data.drivers[0].driver.expression = 'expression goes here' ```