Zambia

1. Subject to clauses (4), (5) and (7), no law shall make any provision that is discriminatory either of itself or in its effect.
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3. In this Article the expression “discriminatory” means affording different treatment to different persons attributable, wholly or mainly to their respective descriptions by race, tribe, sex, place of origin, marital status, political opinions, colour or creed whereby persons of one such description are subjected to disabilities or restrictions to which persons of another such description are not made subject or are accorded privileges or advantages which are not accorded to persons of another such description.
4. Clause (1) shall not apply to any law so far as that law makes provision-
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e. whereby persons of any such description as is mentioned in clause (3) may be subjected to any disability or restriction or may be accorded any privilege or advantage which, having regard to its nature and to special circumstances pertaining to those persons or to persons of any other such description is reasonably justifiable in a democratic society.
… (Art. 23)

1. Where a person is empowered to make a nomination or an appointment to a public office, that person shall ensure—
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b. that fifty percent of each gender is nominated or appointed from the total available positions, unless it is not practicable to do so; ... (Art. 259)