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Method to run another script from one script:
          i) Use "import". This method with a proper design (refer to method iii)) can also be the most reliable (see an example below).
          ii) Use "execfile()",
          iii) exec(open()). This method with a proper design can also be the most reliable (see an example below).
          iv) Use "subprocess".

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Call a function, in a class in a Python script, from another script: code 1 and code 2:
         Code 1:
                    
         Output after running Code 1:
                    
         Code 2:
                    
         Output after running Code 2:
                    

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Call and then run your own functions and modules in different Python files: code 1 and code 2:
         Code 1:
                
         Output from Code 1:
                
         Code 2:
                 
         Output from Code 2:
                

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Monitor specific new files and execute another file: code 1; and Create a .txt file with calling by another file: code 2:
    Code 1 (the lines marked in red below can avoid secondary excution of the Code 2 file trigered by the .txt file created by Code 2):
         
     Code 2:
                   
Before excuting Code 1:          
         
After excuting Code 1:          
         
After copying the two files in the red circle into the folder, the .txt file was generated by Code 2 since the file "ImagePool (12).jpg" was included:          
          
         
In contrast, after copying the four files below into the folder, no .txt file was generated by Code 2 since the file "ImagePool (12).jpg" was not included:          
          
         

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Call and then run your own functions and modules in different Python files: code 1 and code 2:
         Code 1:
                
         Output from Code 1:
                
         Code 2:
                 
         Output from Code 2:
                

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Call and then run your own functions and modules in different Python files: code 1 and code 2:
         Code 1:
         
         Code 2:
         
Output:     
         

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The following shows the outputs when the two scripts, with __name__ == "__main__", run: Code 1 and Code 2:

     Code 1:
         
     Output, which is the top level of Module 1 and the if output of Module 1 only:         
                   
     Code 2:
         
     Output, which are from the execution of the top level of Module 1, the else of Module 1, the executed function of Module 1, and the if output of Module 2:         
         

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Christmas card with turtle: main code with help of code 2:
         
         
         
Code 2:          
         
         
Output:          
         

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Launch script from another script using subprocess.run or subprocess.call: Introduction

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