Syntax Error in Python when writing a file without apparent reason [closed]

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I have no idea why I get a syntax error in my python code even though I checkt in all docs how the commands need to be. This is my code:

class Agent: # Agent class which pickle can dump to a file
   def __init__(self, name, userName):
      self.name = name
      self.context = ""
      self.conversation = ""
      self.userName = userName

   def save(self):  # Saves the agent object to a file
      file = open(f"{self.name}.mtrx", "wb")
      pickle.dump(self, file)
      file.close() 

And the error message is within this line:

    file = open(f"{self.name}.mtrx", "wb")
                                  ^
SyntaxError: invalid syntax

Is the error maybe somewhere else but the compiler spots it there or is actually something wrong about this line of code?