Problem with extract_nwis_df about hydrofunctions

[mroberge]

Hi @DavidLitwin !
Thank you for using HydroFunctions. I apologize, but it looks like I may have updated the interface to hydrofunctions, but haven't updated the documentation. I've actually just made a major change for 0.1.8 that will really improve the user experience, so I haven't worked too hard on fixing all of the old documentation. Anyway, that's no excuse!

Here is what you can do to get yourself a dataframe of hydrology data:

import hydrofunctions as hf

site = '01646000'
start_date = '2017-10-01'
end_date = '2018-10-01'

response = hf.get_nwis(site,'iv', start_date,end_date,parameterCd='00060')
my_dataframe = hf.extract_nwis_df(response.json())

my_dataframe

... and this will produce a nice listing of your new dataframe.

Good luck, and let me know if you have any further trouble!

[DavidLitwin]

Ah, easy enough, thank you. Another question - is there capability to download multiple parameters in the same call? Say:

response = hf.get_nwis(site,'iv', start_date,end_date,parameterCd=['00060','99133','63680'])

Thanks!

[mroberge]

I can't remember if you can do that in 0.1.7, but the new version defaults to request everything collected at a site, and you can list multiple parameters. Unfortunately, you would have to install it from the develop branch on GitHub, because it's not on pypi yet.

[DavidLitwin]

I'm sorry, I'm new to github so I'm still trying to figure this out. I've just tried to install it with:
pip install git+https://github.com/mroberge/hydrofunctions.git@develop
But it seems to give me just version 0.1.7. Am I doing something wrong? Thanks for your help.

[mroberge]

Actually, you have the latest material by installing from Develop, but I didn't modify the version number yet. I usually do that when I finally post everything onto PyPI.

Try loading new data this way (if you don't specify what parameter you want, you'll get every parameter measured at this site:

my_data = hf.NWIS(['01585200','03543500'] 'iv', period='P100D')

This will print out what you have loaded:

my_data

and this will give you a dataframe of just the discharge data:

my_data.df('Q')

If you save the discharge dataframe to a variable, then it is easy to use the Pandas convenience methods, like .plot() or .describe().

[DavidLitwin]

Thanks, got it working!