title: Bokeh plot not showing with show(p) or p.show()
body: <p>Trying to get a Bokeh chart to show with this code, I either get nothing if I use <code>show(p)</code> or </p>
  
  <pre><code>AttributeError: 'Figure' object has no attribute 'show'
  </code></pre>
  
  <p>How can I fix this?</p>
  
  <pre><code>from math import pi
  import pandas as pd
  from bokeh.plotting import figure, show, output_notebook
  from bokeh.models.annotations import Title
  from nsepy import get_history
  from datetime import date
  from datetime import datetime
  from pykalman import KalmanFilter
  
  df  =  get_history(symbol="TCS", start = date(2018,1,1),end = date(2018,7,22))
  print(df)
  kf = KalmanFilter(transition_matrices = [1],
                    observation_matrices = [1],
                    initial_state_mean = df['Close'].values[0],
                    initial_state_covariance = 1,
                    observation_covariance=1,
                    transition_covariance=.01)
  state_means,_ = kf.filter(df[['Close']].values)
  state_means = state_means.flatten()
  
  df["date"] = pd.to_datetime(df.index)
  
  mids = (df.Open + df.Close)/2
  spans = abs(df.Close-df.Open)
  
  inc = df.Close &gt; df.Open
  dec = df.Open &gt; df.Close
  w = 12*60*60*1000 # half day in ms
  
  output_notebook()
  
  TOOLS = "pan,wheel_zoom,box_zoom,reset,save"
  #This causes an exception tol with p.show() no show in figure
  p = figure(x_axis_type="datetime", tools=TOOLS, plot_width=1000, toolbar_location="left",y_axis_label = "Price",
             x_axis_label = "Date")
  p.segment(df.date, df.High, df.date, df.Low, color="black")
  p.rect(df.date[inc], mids[inc], w, spans[inc], fill_color='green', line_color="green")
  p.rect(df.date[dec], mids[dec], w, spans[dec], fill_color='red', line_color="red")
  p.line(df.date,state_means,line_width=1,line_color = 'blue',legend="Kalman filter")
  t = Title()
  t.text = 'Kalman Filter Estimation'
  p.title = t
  p.xaxis.major_label_orientation = pi/4
  p.grid.grid_line_alpha=0.3
  p.show() #Throws attribute error show does not exist
  #show(p) #Nothing happens on this
  </code></pre>