Why am I getting a NameError with below code?

code error message

I am getting a name error with the variable data_A and I cannot figure out why...any help appreciated. Thanks! the variable of concern is data_A

import sys  import csv  import statistics  #modularizing week1 program  def main():        try:          column = int(sys.argv[1])          filename = sys.argv[2]          with open(filename,'r') as csv_file:              csv_x = csv.reader(csv_file, delimiter=' ', skipinitialspace=True)              data_A = [float(line[column-1]) for line in csv_x if (float(line[column-1]))!=-9999.0]      except:          column = int(sys.argv[1])          csv_x = csv.reader(sys.stdin, delimiter= ' ', skipinitialspace=True)          data_A = [float(line[column-1]) for line in csv_x if (float(line[column-1]))!=-9999.0]    #statistical analysis for data  print(      'min:', min(data_A),      'max:', max(data_A),      ', average:', mean(data_A),      ', median:', median(data_A)  )    def compute_stats(values):      import statistics        if values == []:          return(None,None,None,None)      else:          minimum = min(values)          maximum = max(values)          mean = statistics.mean(values)          median = statistics.median(values)          return(minimum,maximum,mean,median)    #call main function if code is not working  if __name__ == "__main__":      main()  

https://stackoverflow.com/questions/67040964/why-am-i-getting-a-nameerror-with-below-code April 11, 2021 at 10:34AM