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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 copy(self, filename, id_=-1, pre_callback=None, post_callback=None):
 """Copy a package or script to all repos. Determines appropriate location (for file shares) and type based on file extension. Args: filename: String path to the local file to copy. id_: Package or Script object ID to target. For use with JDS and CDP DP's only. If uploading a package that does not have a corresponding object, use id_ of -1, which is the default. pre_callback: Func to call before each distribution point starts copying. Should accept a Repository connection dictionary as a parameter. Will be called like: `pre_callback(repo.connection)` post_callback: Func to call after each distribution point finishes copying. Should accept a Repository connection dictionary as a parameter. Will be called like: `pre_callback(repo.connection)` """

        for repo in self._children:
            if is_package(filename):
                copy_method = repo.copy_pkg
            else:
                # All other file types can go to scripts.
                copy_method = repo.copy_script
            if pre_callback:
                pre_callback(repo.connection)
            copy_method(filename, id_)
            if post_callback:
                post_callback(repo.connection)