Question: Write a Python function file_length([ filename] ) which takes the name of a file as input and returns the length of the file. If the

Write a Python function "file_length([filename])" which takes the name of a file as input and returns the length of the file. If the file cannot be found by the interpreter or it cannot be read as a text file, an exception will be raised -- a message will be printed to inform the user that "[filename] is not found."

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