Executing Python script from command line on Windows 7

I seem to have a problem executing a Python script from terminal Win+ R.

I followed these steps:

• The shebang line is used before entering my script for all .py files. An example of what I did below for a script called Primefactorization.py
  
  .

  #! python3
  
        
  
          
          
          
        
  
      

• I created a batch file in the same folder with the same name and enter the following code:

  @python.exe C:\Python Scripts\Primefactorization.py %*
  
        
  
          
          
          
        
  
      

• I added path ( C:\Python Scripts
  
  ) to the variable PATH
  
  in the environment variables window.

• When I try to invoke a script using the Run command in Windows 7, the shell opens and disappears immediately.

• Building on a past answer to a similar issue on Stack Overflow, I also added the following code prompting the user for input before exiting. But it doesn't work.

  x = input('press enter to close')
  
        
  
          
          
          
        
  
      

Could you please let me know where the problem might be?