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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 get_covalent_bonds(self, tol=0.2):
 """ Determines the covalent bonds in a molecule. Args: tol (float):
 The tol to determine bonds in a structure. See CovalentBond.is_bonded. Returns: List of bonds """

        bonds = []
        for site1, site2 in itertools.combinations(self._sites, 2):
            if CovalentBond.is_bonded(site1, site2, tol):
                bonds.append(CovalentBond(site1, site2))
        return bonds