david_Yakhin_312 IterCalc 5173			Алмаз Сейтхазин (КФ МГУ, кафедра НДС) IterCalc 5205
t	1	def itercalc():	t	1	def itercalc():
	2	stack = []		2	stack = []
	3	result = None		3	result = None
	4	while True:		4	while True:
	5	cmd = (yield result)		5	cmd = (yield result)
	6	result = None		6	result = None
	7	if cmd == '?':		7	if cmd == '?':
	8	if not stack:		8	if not stack:
	9	print('Insufficient stack')		9	print('Insufficient stack')
	10	else:		10	else:
	11	result = stack[-1]		11	result = stack[-1]
	12	elif cmd in ['+', '-', '*', '/']:		12	elif cmd in ['+', '-', '*', '/']:
	13	if len(stack) < 2:		13	if len(stack) < 2:
	14	print('Insufficient stack')		14	print('Insufficient stack')
	15	else:		15	else:
	16	b = stack.pop()		16	b = stack.pop()
	17	a = stack.pop()		17	a = stack.pop()
	18	try:		18	try:
	19	if cmd == '+':		19	if cmd == '+':
	20	stack.append(a + b)		20	stack.append(a + b)
	21	elif cmd == '-':		21	elif cmd == '-':
	22	stack.append(a - b)		22	stack.append(a - b)
	23	elif cmd == '*':		23	elif cmd == '*':
	24	stack.append(a * b)		24	stack.append(a * b)
	25	elif cmd == '/':		25	elif cmd == '/':
	26	if b == 0:		26	if b == 0:
	27	print('Zero division')		27	print('Zero division')
	28	stack.append(a)		28	stack.append(a)
	29	stack.append(b)		29	stack.append(b)
	30	else:		30	else:
	31	stack.append(a // b)		31	stack.append(a // b)
	32	except:		32	except:
	33	stack.append(a)		33	stack.append(a)
	34	stack.append(b)		34	stack.append(b)
	35	print('Operation failed')		35	print('Operation failed')
	36	else:		36	else:
	37	try:		37	try:
	38	num = int(cmd)		38	num = int(cmd)
	39	stack.append(num)		39	stack.append(num)
	40	except ValueError:		40	except ValueError:
	41	print('Unknown command')		41	print('Unknown command')

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