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objset: Add frozenset tests, skippable if frozenset not available.
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‎tests/basics/frozenset1.py‎

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# basic sets
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try:
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frozenset
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except NameError:
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print("SKIP")
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import sys
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sys.exit()
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s = frozenset({1})
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print(s)
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s = frozenset({3, 4, 3, 1})
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print(sorted(s))

‎tests/basics/frozenset_add.py‎

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try:
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frozenset
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except NameError:
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print("SKIP")
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import sys
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sys.exit()
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s = frozenset({1, 2, 3, 4})
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try:
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print(s.add(5))
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except AttributeError:
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print("AttributeError")

‎tests/basics/frozenset_binop.py‎

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try:
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frozenset
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except NameError:
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print("SKIP")
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import sys
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sys.exit()
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sets = [
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frozenset(), frozenset({1}), frozenset({1, 2}), frozenset({1, 2, 3}), frozenset({2, 3}),
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frozenset({2, 3, 5}), frozenset({5}), frozenset({7})
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]
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for s in sets:
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for t in sets:
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print(sorted(s), '|', sorted(t), '=', sorted(s | t))
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print(sorted(s), '^', sorted(t), '=', sorted(s ^ t))
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print(sorted(s), '&', sorted(t), '=', sorted(s & t))
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print(sorted(s), '-', sorted(t), '=', sorted(s - t))
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u = s.copy()
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u |= t
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print(sorted(s), "|=", sorted(t), '-->', sorted(u))
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u = s.copy()
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u ^= t
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print(sorted(s), "^=", sorted(t), '-->', sorted(u))
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u = s.copy()
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u &= t
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print(sorted(s), "&=", sorted(t), "-->", sorted(u))
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u = s.copy()
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u -= t
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print(sorted(s), "-=", sorted(t), "-->", sorted(u))
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print(sorted(s), '==', sorted(t), '=', s == t)
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print(sorted(s), '!=', sorted(t), '=', s != t)
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print(sorted(s), '>', sorted(t), '=', s > t)
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print(sorted(s), '>=', sorted(t), '=', s >= t)
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print(sorted(s), '<', sorted(t), '=', s < t)
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print(sorted(s), '<=', sorted(t), '=', s <= t)

‎tests/basics/frozenset_copy.py‎

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try:
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frozenset
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except NameError:
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print("SKIP")
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import sys
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sys.exit()
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s = frozenset({1, 2, 3, 4})
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t = s.copy()
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print(type(t))
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for i in s, t:
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print(sorted(i))

‎tests/basics/frozenset_difference.py‎

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try:
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frozenset
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except NameError:
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print("SKIP")
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import sys
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sys.exit()
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l = [1, 2, 3, 4]
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s = frozenset(l)
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outs = [s.difference(),
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s.difference(frozenset({1})),
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s.difference(frozenset({1}), [1, 2]),
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s.difference(frozenset({1}), {1, 2}, {2, 3})]
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for out in outs:
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print(type(out), sorted(out))
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s = frozenset(l)
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try:
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print(s.difference_update({1}))
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except AttributeError:
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print("AttributeError")

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