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RM5280
Frequent Visitor

Power query python dataset from an other table

Hello,

 

I have a table called "mytab" contaning a column "Expression" like this :

 

RM5280_0-1594997038689.png

 

I am writing a python script (a regex function) in "mytab2" which need to import "expression" from "mytab" in a pandas dataframe list.

I'd like to do some thing like this :

 

import pandas as pd

myListOfExpression = pd.DataFrame(['mytab'].dataset['Expression'],columns=['Expression1'],dtype=float)

 

I know that he red ['mytab']. is wrong, but I try to specify the table "mytab".

 

Any idea ?

 

Thanks

 

2 REPLIES 2
ImkeF
Super User II
Super User II

Hi @RM5280 ,

the python-script will sit in a Python.Execute function in PQ. It will be escaped in there. In order to integrate some objects from the M-world, you have to unescapce the script and combine with ampersand "&":

 

Python.Execute ( "import pandas as pd

myListOfExpression = pd.DataFrame( " & mytab & "dataset['Expression'],columns=['Expression1'],dtype=float)

 

This syntax is probably wrong, as "mytab" returns the whole table, but this is the general principle on how to combine M-objects with python scripts.

 

mytab[Expression] would return a list with the column contents BTW. 

 

Imke Feldmann (The BIccountant)

If you liked my solution, please give it a thumbs up. And if I did answer your question, please mark this post as a solution. Thanks!

How to integrate M-code into your solution -- How to get your questions answered quickly -- How to provide sample data -- Check out more PBI- learning resources here -- Performance Tipps for M-queries

RM5280
Frequent Visitor

Hello, 

 

thanks for your answer !

 

I tried what you said, but it doesn't works :

 

i try this : = Python.Execute("import pandas as pd#(lf)#(lf)myListOfExpression = pd.DataFrame("&[mytab]&"dataset['Expression'],dtype=float)",[dataset=#"Colonnes renommées"])

 

I have this answer : We have detected an unknown identifier. Did you use the shortened syntax [field] for a _[field] outside of a "each" expression?

 

I also tried ["mytab"], ['mytab'] but don't work either.

 

Any idea ?

 

Thanks

 

 

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