title: os.system opening same application multiple times in python
body: <p>This program is basically a hardcoded personal assistant which I use to do basic stuff.
  I tell the program to 'Open Firefox', it opens it perfectly, When I give another command, lets say 'Open Sublime', it will still open Firefox. Why is that? I don't want it to open other applications if I didn't ask it to. Is it happening because I'm running the application but I am not closing it through the script, Like I press 'X' and close the window. Really stuck on this one!</p>
  <p>Here is my code...</p>
  <pre><code>import speech_recognition as sr
  import pyttsx3
  import json
  import random
  import os
  import subprocess
  
  engine = pyttsx3.init('sapi5')
  voices = engine.getProperty('voices')
  engine.setProperty('voice', voices[1].id)
  
  def text2speech(audio):
      engine.setProperty('rate', 180) # Sets speed percent can be more than 100
      engine.say(audio)
      engine.runAndWait()
  
  def takeCommand():
      r = sr.Recognizer()
  
      with sr.Microphone() as source:
          r.adjust_for_ambient_noise(source)
          print('Listening...')
          r.pause_threshold = 1
          audio = r.listen(source)
  
      try:
          print('Recognizing...')
          query = r.recognize_google(audio, language = 'en-in')
          print('You: ', query)
      except Exception as e:
          print(e)
          print('Unable to recognize your voice.')
          return 'None'
      return query
  
  def rubysays(key): # key is the tag or key element in the data.json which contains the responses
      length = len(data[key])
      # print(length)
      say_this = data[key][random.randint(0, length - 1)]
      return say_this
  
  def startruby():
      query = takeCommand().lower()
  
      if 'open firefox' or 'pen firefox' or 'firefox' or 'fire fox' in query: # opens Visual Studio Code
          say_this = 'Opening Firefox Browser'
          print(say_this)
          text2speech(say_this)
          # os.startfile(r'C:\Program Files\Mozilla Firefox\firefox.exe')
          os.system(r'C:\Program Files\Mozilla Firefox\firefox.exe')
      
      elif 'open code' or 'pen code' in query: # opens Visual Studio Code
          say_this = 'Opening Visual Studio Code'
          print(say_this)
          text2speech(say_this)
          # os.startfile(r'C:\Program Files\Microsoft VS Code\Code.exe')
          os.system(r'C:\Program Files\Microsoft VS Code\Code.exe')
      
      elif 'open sublime' or 'pen sublime' or 'open sub lime' or 'pen sub lime'in query: # opens Sublime Text
          say_this = 'Opening Sublime Text'
          print(say_this)
          text2speech(say_this)
          # os.startfile(r'C:\Program Files\Sublime Text 3\sublime_text.exe')
          os.system(r'C:\Program Files\Sublime Text 3\sublime_text.exe')
  
      elif 'open cmd' or 'c m d' in query: # opens command prompt
          say_this = 'Opening Windows Terminal'
          print(say_this)
          text2speech(say_this)
          # os.startfile(r'C:\Users\JasonPC\AppData\Local\Microsoft\WindowsApps\wt.exe')
          os.system(r'C:\Users\JasonPC\AppData\Local\Microsoft\WindowsApps\wt.exe')
  
      elif 'open discord' or 'discord' in query: # opens Discord
          say_this = 'Opening Discord'
          print(say_this)
          text2speech(say_this)
          # os.startfile(r'C:\Users\JasonPC\AppData\Local\Discord\Update.exe')
          os.system(r'C:\Users\JasonPC\AppData\Local\Discord\Update.exe')
      
      elif 'open steam' or 'steam' in query: # opens Steam
          say_this = 'Opening Steam'
          print(say_this)
          text2speech(say_this)
          # os.startfile(r'C:\Program Files (x86)\Steam\steam.exe')
          os.system(r'C:\Program Files (x86)\Steam\steam.exe')
      
      elif 'open calculator' or 'calculator' in query: # opens Calculator
          say_this = 'Opening Calculator'
          print(say_this)
          text2speech(say_this)
          # os.startfile(r'C:\Windows\System32\calc.exe')
          os.system(r'C:\Windows\System32\calc.exe')
      
      elif 'open discord' or 'discord' in query: # opens Camera
          say_this = 'Opening Camera'
          print(say_this)
          text2speech(say_this)
          os.system('start microsoft.windows.camera:')
      
      elif 'whatsapp' or 'whats app' or 'whats up' or &quot;what's app&quot; or &quot;what's up&quot; in query: # opens WhatsApp
          say_this = 'Opening WhatsApp'
          print(say_this)
          text2speech(say_this)
          # os.startfile(r'C:\Users\JasonPC\AppData\Local\WhatsApp\WhatsApp.exe')
          os.system(r'C:\Users\JasonPC\AppData\Local\WhatsApp\WhatsApp.exe')
  
  
  if __name__ == '__main__':
      # use the json
      f = open('data.json')  
      data = json.load(f)
  
      text2speech('Hey this is Ruby!')
  
      while True:
          query = takeCommand().lower()
  
          if 'ruby' in query or 'rubi' in query:
              say_this = rubysays('greeting')
              print('You:', say_this)
              text2speech(say_this)
              startruby()
          
          if 'bye' in query or 'goodbye' in query:
              say_this = rubysays('bye')
              print(say_this)
              text2speech(say_this)
              exit()
  </code></pre>