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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 find_missing_env(self):
 """Find any missing environment variables"""

        missing = []
        for e in self.env:
            if e.default_val is None and e.set_val is None:
                if e.env_name not in os.environ:
                    missing.append(e.env_name)

        if missing:
            raise BadOption("Some environment variables aren't in the current environment", missing=missing)