code: def main():
      # data
      J = 8
      data_y = np.array([28, 8, -3, 7, -1, 1, 18, 12])
      data_sigma = np.array([15, 10, 16, 11, 9, 11, 10, 18])
  
      standata = dict(J=J, y=data_y, sigma=data_sigma)
      fit = pystan.stan(
          "eight_schools.stan", data=standata, iter=100000
      )
      print(fit)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import numpy
  import pystan
label_desc: Use image node_id 1 for calling a global function with example usage: main() without return types