#! /usr/bin/env python3
#
def schoolyear_barh ( ):

#*****************************************************************************80
#
## schoolyear_barh() makes a horizontal bar plot of schoolyear lengths.
#
#  Licensing:
#
#    This code is distributed under the MIT license.
#
#  Modified:
#
#    28 February 2023
#
#  Author:
#
#    John Burkardt
#
  import csv
  import matplotlib.pyplot as plt
  import numpy as np

  print ( '' )
  print ( 'schoolyear_barh():' )
  print ( '  Create a horizontal bar plot of the length of schoolyears.' )
#
#  Read the values from the file.
#
  types = [ 'U20', 'i4' ]
  data = np.genfromtxt ( 'schoolyear_data.csv', dtype = types, \
    delimiter=',', names = True )

  days = data['Days']
  name = data['Country']
#
#  We want the list to be plotted in alphabetic order, reading 
#  from top down to bottom.  To do this, we have to reverse our data.
#
  days = np.flip ( days )
  name = np.flip ( name )

  n = len ( days )
  country = np.linspace ( 1, n, n )
#
#  Create the bar plot.
#
  plt.barh ( country, days )
  plt.grid ( True )
  plt.title ( 'Schoolyear lengths', fontsize = 16 )
  plt.xlabel ( '<-- Days -->', fontsize = 16 )
  plt.yticks ( country, name, fontsize = 6 )
  filename = 'schoolyear_barh.png'
  plt.savefig ( filename )
  plt.show ( )
  plt.close ( )
  print ( '  Graphics saved as "%s"' % ( filename ) )

  return

if ( __name__ == '__main__' ):
  schoolyear_barh ( )