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How do I use exec() to parce an import statement to find if a module exists within a program

How do I use this format of code to find if a module exists within a python program? I know there are similar questions like this, but i need to specifically use exec() to parse an import statement.

def file_exists(name):
  try:
    exec()
  return True #if the file does exist
  except:
    return False

#tests
file_exists(module1) #should return true because there is a module named module1
file_exists(module2) #should return false because there is not a module named module2.


source https://stackoverflow.com/questions/67766657/how-do-i-use-exec-to-parce-an-import-statement-to-find-if-a-module-exists-with

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