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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def expand_source_paths(paths):
 """ Convert pyc files into their source equivalents."""

    for src_path in paths:
        # only track the source path if we can find it to avoid double-reloads
        # when the source and the compiled path change because on some
        # platforms they are not changed at the same time
        if src_path.endswith(('.pyc', '.pyo')):
            py_path = get_py_path(src_path)
            if os.path.exists(py_path):
                src_path = py_path
        yield src_path