ColumnDataSource constructor

Community Support
1

Hi all, I have a super easy question for you. Why does this script fail with
"ValueError: expected an element of Dict(String, Seq(Any)), got {'w': 4}" ?

from bokeh.models import ColumnDataSource

d = {'x' : 1, 'y' : 2, 'h' : 3, 'w' : 4 }
ds = ColumnDataSource(d)

That is basically the same as the ColumnDataSource usage here, and in
various other examples.

https://github.com/bokeh/bokeh/blob/master/tests/glyphs/Rect.py

So I am kind of confused- thanks in advance.

Alex

2

ColumnDataSource expects an argument of a dictionary of sequences. You have a dictionary of ints. To get it working, you can write something like this…
d = {‘x’ : [1], ‘y’ : [2], ‘h’ : [3], ‘w’ : [4] }

3

It should work if the values are set as list:
‘W’: [4]

Daniel

···

Am 29.12.2016 6:12 nachm. schrieb “Alex Rice” [email protected]:

Hi all, I have a super easy question for you. Why does this script fail with

“ValueError: expected an element of Dict(String, Seq(Any)), got {‘w’: 4}” ?

from bokeh.models import ColumnDataSource

d = {‘x’ : 1, ‘y’ : 2, ‘h’ : 3, ‘w’ : 4 }

ds = ColumnDataSource(d)

That is basically the same as the ColumnDataSource usage here, and in

various other examples.

https://github.com/bokeh/bokeh/blob/master/tests/glyphs/Rect.py

So I am kind of confused- thanks in advance.

Alex

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4

Thanks James, and Daniel. I was hung up looking at the
tests/glyphs/Rect.py and not paying enough attention to the error
message :slight_smile:

···

On Thu, Dec 29, 2016 at 10:31 AM, 'Daniel Krause' via Bokeh Discussion - Public <[email protected]> wrote:

It should work if the values are set as list:
'W': [4]

Daniel

Am 29.12.2016 6:12 nachm. schrieb "Alex Rice" <[email protected]>:

Hi all, I have a super easy question for you. Why does this script fail
with
"ValueError: expected an element of Dict(String, Seq(Any)), got {'w': 4}"
?

from bokeh.models import ColumnDataSource

d = {'x' : 1, 'y' : 2, 'h' : 3, 'w' : 4 }
ds = ColumnDataSource(d)

That is basically the same as the ColumnDataSource usage here, and in
various other examples.

https://github.com/bokeh/bokeh/blob/master/tests/glyphs/Rect.py

So I am kind of confused- thanks in advance.

Alex

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