circuitpython/tests/micropython/heapalloc_yield_from.py
David Lechner 3dc324d3f1 tests: Format all Python code with black, except tests in basics subdir.
This adds the Python files in the tests/ directory to be formatted with
./tools/codeformat.py.  The basics/ subdirectory is excluded for now so we
aren't changing too much at once.

In a few places `# fmt: off`/`# fmt: on` was used where the code had
special formatting for readability or where the test was actually testing
the specific formatting.
2020-03-30 13:21:58 +11:00

40 lines
621 B
Python

# Check that yield-from can work without heap allocation
import micropython
# Yielding from a function generator
def sub_gen(a):
for i in range(a):
yield i
def gen(g):
yield from g
g = gen(sub_gen(4))
micropython.heap_lock()
print(next(g))
print(next(g))
micropython.heap_unlock()
# Yielding from a user iterator
class G:
def __init__(self):
self.value = 0
def __iter__(self):
return self
def __next__(self):
v = self.value
self.value += 1
return v
g = gen(G())
micropython.heap_lock()
print(next(g))
print(next(g))
micropython.heap_unlock()