Scan with two moving averages and candlestick pattern

There is no need to write any custom code for the 20 period SMA above the 200 SMA. Nor is there any need to write custom code for the close being above the 20 period SMA. All of those elements from your specifications can be constructed with just a few clicks of the mouse using the Condition Wizard.

Details here:

https://www.hahn-tech.com/thinkorswim-condition-wizard/

Once you learn how to use the Condition Wizard you will realize there is very little need to write any custom code to create your scans. It is even possible to build a condition for candlestick patterns, such as green-red-green. But I will provide a custom code solution for your candlestick pattern. You can build a separate study filter using the Condition Wizard to cover the moving average elements of your specifications. Then add a second study filter to contain this custom code.

Here is the code for your candlestick pattern filter:

def greenCandle = close > open;
def redCandle = close < open;
def patternOne = greenCandle and redCandle[1] and greenCandle[2];
def patternTwo = greenCandle and redCandle[1] and redCandle[2] and greenCandle[3];
plot scan = patternOne or patternTwo;