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# Tests for deques with "check overflow" flag and other extensions
# wrt to CPython.
try:
try:
from ucollections import deque
except ImportError:
from collections import deque
except ImportError:
print("SKIP")
raise SystemExit
# Initial sequence is not supported
try:
deque([1, 2, 3], 10)
except ValueError:
print("ValueError")
# Not even empty list, only empty tuple
try:
deque([], 10)
except ValueError:
print("ValueError")
# Only fixed-size deques are supported, so length arg is mandatory
try:
deque(())
except TypeError:
print("TypeError")
d = deque((), 2, True)
try:
d.popleft()
except IndexError:
print("IndexError")
print(d.append(1))
print(d.popleft())
d.append(2)
print(d.popleft())
d.append(3)
d.append(4)
print(d.popleft(), d.popleft())
try:
d.popleft()
except IndexError as e:
print(repr(e))
d.append(5)
d.append(6)
print(len(d))
try:
d.append(7)
except IndexError as e:
print(repr(e))
print(len(d))
print(d.popleft(), d.popleft())
print(len(d))
try:
d.popleft()
except IndexError as e:
print(repr(e))
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