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# Tests for deques with "check overflow" flag and other extensions
# wrt to CPython.
try:
from collections import deque
except ImportError:
print("SKIP")
raise SystemExit
# Initial sequence is supported
d = deque([1, 2, 3], 10)
# iteration over sequence
for x in d:
print(x)
# Iterables larger than maxlen have the beginnings removed, also tests
# iteration through conversion to list
d = deque([1, 2, 3, 4, 5], 3)
print(list(d))
# Empty iterables are also supported
deque([], 10)
# Extending deques with iterables
d.extend([6, 7])
print(list(d))
# Accessing queue elements via index
d = deque((0, 1, 2, 3), 5)
print(d[0], d[1], d[-1])
# Writing queue elements via index
d[3] = 5
print(d[3])
# Accessing indices out of bounds raises IndexError
try:
d[4]
except IndexError:
print("IndexError")
try:
d[4] = 0
except IndexError:
print("IndexError")
# Removing elements with del is not supported, fall back on mp_obj_subscr() error message
try:
del d[0]
except TypeError:
print("TypeError")
# 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")
try:
d.pop()
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))
try:
d.pop()
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))
try:
d.appendleft(8)
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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