input: Write a python function to classify a given Python function as a Predictive Function.
  assert classify_function(lambda x: x + 1) == False
  assert classify_function(lambda x: x + x) == False
  assert classify_function(lambda x: x > 0) == False
  assert classify_function(lambda x: x.predict([1, 2, 3])) == True
output: def classify_function(func):
      try:
          # Try to extract the source code of the lambda function
          import inspect
          source = inspect.getsource(func)
          # Check if the function contains a call to 'predict'
          return 'predict' in source
      except:
          return False