# Sarven Sentry Python Help!

**URL:** <https://discourse.codecombat.com/t/sarven-sentry-python-help/9500>\
**Category:** Uncategorized\
**Created:** [November 1, 2016, 8:24pm UTC](https://discourse.codecombat.com/t/sarven-sentry-python-help/9500 "2016-11-01T20:24:14Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![MysterioGaming](https://avatars.discourse-cdn.com/v4/letter/m/3bc359/32.png) [@MysterioGaming](https://discourse.codecombat.com/u/MysterioGaming)\
**Post date:** [November 1, 2016, 8:24pm UTC](https://discourse.codecombat.com/t/sarven-sentry-python-help/9500/1 "2016-11-01T20:24:14Z")

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I have been trying to figure out how to beat this level for some time now. Any help? Here is my code:

`  
while True:  
flagGreen = hero.findFlag(“green”)  
flagBlack = hero.findFlag(“black”)  
fbx = flagBlack.pos.x  
fby = flagBlack.pos.y

```
# If there's a flagGreen...
if flagGreen:
    
    # Build a fence at flagGreen's position.
    self.buildXY("fence", fgx, fgy)
    self.pickUpFlag(flagGreen)
if flagBlack:
    self.buildXY("fire-trap", fbx, fby)
    self.pickUpFlag(flagBlack)
hero.moveXY(43, 31)

```

`  
Please help me if you can.

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**Author:** ![MunkeyShynes](https://sea2.discourse-cdn.com/flex016/user_avatar/discourse.codecombat.com/munkeyshynes/32/9277_2.png) [@MunkeyShynes](https://discourse.codecombat.com/u/MunkeyShynes)\
**Post date:** [November 1, 2016, 9:39pm UTC](https://discourse.codecombat.com/t/sarven-sentry-python-help/9500/2 "2016-11-01T21:39:25Z")

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for starters, you haven’t defined fgx or fgy.

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<div class="post-metadata">

**Author:** ![andreas](https://avatars.discourse-cdn.com/v4/letter/a/ee7513/32.png) [@andreas](https://discourse.codecombat.com/u/andreas)\
**Post date:** [November 2, 2016, 12:33am UTC](https://discourse.codecombat.com/t/sarven-sentry-python-help/9500/3 "2016-11-02T00:33:26Z")

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Yes, @MunkeyShynes is right you need yo define what fbx or fly is before using them. other than that you look about right on.