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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 exists(self, names):
 """Checks if the given file list exists in the current directory level. in names of type str The names to check. return exists of type str The names which exist. """

        if not isinstance(names, list):
            raise TypeError("names can only be an instance of type list")
        for a in names[:10]:
            if not isinstance(a, basestring):
                raise TypeError(
                        "array can only contain objects of type basestring")
        exists = self._call("exists",
                     in_p=[names])
        return exists