micropython/tests/basics/iter1.py

80 lines
1.6 KiB
Python

# test user defined iterators
# this class is not iterable
class NotIterable:
pass
try:
for i in NotIterable():
pass
except TypeError:
print('TypeError')
# this class has no __next__ implementation
class NotIterable:
def __iter__(self):
return self
try:
print(all(NotIterable()))
except TypeError:
print('TypeError')
class MyStopIteration(StopIteration):
pass
class myiter:
def __init__(self, i):
self.i = i
def __iter__(self):
return self
def __next__(self):
if self.i <= 0:
# stop in the usual way
raise StopIteration
elif self.i == 10:
# stop with an argument
raise StopIteration(42)
elif self.i == 20:
# raise a non-stop exception
raise TypeError
elif self.i == 30:
# raise a user-defined stop iteration
print('raising MyStopIteration')
raise MyStopIteration
else:
# return the next value
self.i -= 1
return self.i
for i in myiter(5):
print(i)
for i in myiter(12):
print(i)
try:
for i in myiter(22):
print(i)
except TypeError:
print('raised TypeError')
try:
for i in myiter(5):
print(i)
raise StopIteration
except StopIteration:
print('raised StopIteration')
for i in myiter(32):
print(i)
# repeat some of the above tests but use tuple() to walk the iterator (tests mp_iternext)
print(tuple(myiter(5)))
print(tuple(myiter(12)))
print(tuple(myiter(32)))
try:
tuple(myiter(22))
except TypeError:
print('raised TypeError')