Putting custom error messages in Python

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I want to create custom error messages for a function.

def tr( launch_speed , launch_angle_deg , num_samples ):

#Error displays
   try:
      launch_speed>0
   except:
      raise Exception("Launch speed has to be positive!")   
   try:
      0<launch_angle_deg<90
   except:
      raise Exception("Launch angle has to be 0 to 90 degrees!")    
   try:
      um_samples = int(input())
   except:
      raise Exception("Integer amount of samples!")  
   try:
      num_samples >=2
   except:
      raise Exception("At least 2 samples!")    

Essentially, what I want is to get an error message every time a wrong value has been written in the function variables, and I've tried creating these messages based on what I've gathered on the Internet, but it doesn't seem to work.

asked 1 min ago

George

1

Putting custom error messages in Python