Bokeh: Column DataSource part giving error

Question

I am trying to create an interactive bokeh plot that holds multiple data and I am not sure why I am getting the error

ValueError: expected an element of ColumnData(String, Seq(Any)),got {'x': 6.794, 'y': 46.8339999999999, 'country': 'Congo, Dem. Rep.', 'pop': 3.5083789999999997, 'region': 'Sub-Saharan Africa'}

source = ColumnDataSource(data={
'x'       : data.loc[1970].fertility,
'y'       : data.loc[1970].life,
'pop'     : (data.loc[1970].population / 20000000) + 2,
'region'  : data.loc[1970].region,

})

I have tried two different data sets by importing data from excel and have been running out of issues on exactly why this happening.

Answer 1

As the name suggests, the ColumnDataSource is a data structure for storing columns of data. This means that the value of every key in .data must be a column, i.e. a Python list, a NumPy array, or a Pandas series. But you are trying to assign plain numbers as the values, which is what the error message is telling you:

I am trying to create an interactive bokeh plot that holds multiple data and I am not sure why I am getting the error

expected an element of ColumnData(String, Seq(Any))

This is saying acceptable, expected values are dicts that map strings to sequences. But what you passed is clearly not that:

got {'x': 6.794, 'y': 46.8339999999999, 'country': 'Congo, Dem. Rep.', 'pop': 3.5083789999999997, 'region': 'Sub-Saharan Africa'}

The value for x for instance is just the number 6.794 and not an array or list, etc.