IOError: cannot identify image file <StringIO.StringIO instance

[AHMAD FAIRUZ ALI]

Dears,

I've install mapsplotlib and try to run the following,

However, got the following.

IOError: cannot identify image file <StringIO.StringIO instance

I believe it was due to Pillow module didn't recognize certain image format.

Kindly advise.

[Thomas Cassou]

Hi @dakmatt,
Thanks for sharing, I tried to reproduce with the following data based on your screenshot:

df = pd.DataFrame(
    [
        ["JUMLAH", 790136, np.nan, np.nan],
        ["ALOR GAJAH", 173712, 2.382211, 102.211561],
        ["Ayer Pa'Abas", 2644, 2.396907, 102.166641],
    ],
    columns=['label', 'size', 'latitude', 'longitude'],
)

mplt.plot_markers(df)

and it worked... except for the fact that the NaN values lead to a weird marker on the map, I'll add that improvement to the backlog:

Could you share more so that I can reproduce your error?
I believe it is due to an unsuccessful query to Google APIs, which then return a wrong string (not an image basically) and Pillow fails to load it. Can't be 100% sure given the context though.

If I can reproduce it, I'm more than happy to add some verbose to the error, I acknowledge it's not very helpful at the moment!

Hope it helps,

Thomas

[Thomas Cassou]

Added this issue to the board #4

[Thomas Cassou]

Any luck @dakmatt ?

[Rudolf Byker]

I can confirm that this happens when Google sends a "403" response code. For me, it meant that I forgot to enable the "static maps" API.

[Thomas Cassou]

Ok thanks @rudolfbyker, I'll add some logic to handle the response codes.

[Thomas Cassou]

I released version 1.0.6 on pypi with HTTP error handling, it should prevent this issue in the future.
Thanks for reporting!