how to increase variable name in Python? -

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I am creating a simulation program.

I manually list the Python 

  var1 = [mass_a, velocity_a, velocity_a] var2 = [mass_b, velocity_b, velocity_b] ... < / Code>  
 How to change the number in the variable for the loop before launching the program? Something I tried  
  for category (2): print (var + str (i))   
 but they do not work   
 
 
 always remember  
 if you have ever used the numbers as your example You must consider the name of the variable, you should consider an  sequential index worthy  data structure like array or list, to create a list in Python, we  
  var = [ [Mass_a, velocity_a, velocity_a], [mass_b, velocity_b, velocity_b]]   
 If you should sometimes name the variable with different suffixes like  
  var_A = [mass_a, velocity_a, velocity_a] var_B = [mass_b, Velocity_b, velocity_b]   
 You should consider a  non-sequential index worthy  data structure like helmpe or dictionary, the key of this dictionary should be different suffix and Values ​​should be assigned to the corresponding variable that we do to create a dictionary in Python  
 < Code> var = {'A': [mass_a, Velocity_a, velocity_a], 'b': [mass_b, velocity_b, velocity_b]}

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