[Qgis-user] Write vector attribute table from pandas dataframe

[Wouter Impens]

Hi,

If you have a field to join on, you could export the dataframe to something
that is readable in QGIS like csv or xlsx

Greetings
Wouter

Op za 23 apr. 2022 om 19:34 schreef Nicolas Cadieux via Qgis-user <
qgis-user at lists.osgeo.org>:

> Hi Ming,
>
> The best thing would be to show your code and ask others how it can be
> optimized.  I find that https://gis.stackexchange.com/ is the best place
> to do this but this user list definitely has some very  competent
> programmers.  Not being one of those competent programmers, I will just
> state that pandas and geopandas use a process called vectorization where
> the “for loop” is done for you.
>
>
> https://medium.com/analytics-vidhya/understanding-vectorization-in-numpy-and-pandas-188b6ebc5398
>
> This means that looping over elements in a dataframe can be MUCH slower
> than using vectorization.  So basically, you need to figure out the right
> code and avoid “for loops“ when using dataframes.
>
> Hope this helps
>
> Nicolas Cadieux
> https://gitlab.com/njacadieux
>
> Le 22 avr. 2022 à 11:50, ming han via Qgis-user <qgis-user at lists.osgeo.org>
> a écrit :
>
> 
> Hi everyone
>
>      Is there an efficient way to copy data in a pandas dataframe to the
> vector attribute table?
>
>       I am looping element by element, which is very slow.
>
> Thanks
> Ming
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