Parse Years in Python 3.4 Pandas and Bokeh from counter dictionary - python-3.x

Question

I'm struggling with creating a Bokeh time series graph from the output of the counter function from collections.
import pandas as pd
from bokeh.plotting import figure, output_file, show
import collections
plotyears = []
counter = collections.Counter(plotyears)
output_file("years.html")
p = figure(width=800, height=250, x_axis_type="datetime")
for number in sorted(counter):
yearvalue = number, counter[number]
p.line(yearvalue, color='navy', alpha=0.5)
show(p)
The output of yearvalue when printed is:
(2013, 132)
(2014, 188)
(2015, 233)
How can I make bokeh make the years as x-axis and numbers as y-axis. I have tried to follow the Time series tutorial, but I can't use the pd.read_csv and parse_dates=['Date'] functionalities since I'm not reading a csv file.

Answer 1

The simple way is to convert your data into a pandas DataFrame (with pd.DataFrame) and after create a datetime column with your year column.
simple example :
import pandas as pd
from bokeh.plotting import figure, output_notebook, show
output_notebook()
years = [2012,2013,2014,2015]
val = [230,120,200,340]
# Convert your data into a panda DataFrame format
data=pd.DataFrame({'year':years, 'value':val})
# Create a new column (yearDate) equal to the year Column but with a datetime format
data['yearDate']=pd.to_datetime(data['year'],format='%Y')
# Create a line graph with datetime x axis and use datetime column(yearDate) for this axis
p = figure(width=800, height=250, x_axis_type="datetime")
p.line(x=data['yearDate'],y=data['value'])
show(p)