Showing results for 
Search instead for 
Did you mean: 
Frequent Visitor

Power query python dataset from an other table



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




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 ?




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

Frequent Visitor



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 ?





Helpful resources

PBI_User Group Leader_768x460.jpg

Manage your user group events

Check out the News & Announcements to learn more.

Get Ready for Power BI Dev Camp

Microsoft named a Leader in The Forrester Wave

Microsoft received the highest score of any vendor in both the strategy and current offering categories.

Get Ready for Power BI Dev Camp

Power BI Dev Camp - September 30th, 2021

Mark your calendars and join us for our next Power BI Dev Camp!

PowerPlatform 768x460.png

Microsoft Learn

Check out our new Discover Your Career Path blog post series and get all the details.

Top Kudoed Authors