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# coding=utf-8
from python.util import has_token_sequence, string_almost_equal, \
string_contains_number, get_tokens, get_numbers, get_exception_desc
from server.hints import Hint
id = 212
group = 'introduction'
number = 11
visible = True
solution = '''\
from ev3dev import *
from mindstorms_widgets import mindstorms_widgets
def sgn(x):
return -1 if x<0 else (1 if x>0 else 0)
robot = mindstorms_widgets()
robot.connect_motor( 'left' )
robot.connect_motor( 'right' )
robot.connect_sensor( 'gyro' )
robot.connect_sensor( 'touch' )
smer = hitrost = 0
robot.reset_gyro()
robot.gyro_set_mode( 'angle' )
prev_smer = -1
while 1:
smer = robot.gyro_sensor_measure()
if smer!=prev_smer:
print ("Kot:", smer)
prev_smer = smer
if robot.touch_sensor_measure():
robot.reset_gyro()
print ( robot.gyro_sensor_measure() )
if abs(smer) < 10:
hitrost = 10*sgn(smer)
else:
if abs(smer) > 100:
hitrost = 100*sgn(smer)
else:
hitrost = smer
if abs(smer) > 1:
L, R = -hitrost, hitrost
else:
L = R = 0
robot.move_tank('on', lr_power=[L,R])
'''
hint_type = {
'mW_init': Hint('mW_init'),
'connectMotorLeft': Hint('connectMotorLeft'),
'connectMotorRight': Hint('connectMotorRight'),
'connectGyro': Hint('connectGyro'),
'connectTouch': Hint('connectTouch'),
'resetGyro': Hint('resetGyro'),
'setGyroMode': Hint('setGyroMode'),
'gyroMeasure': Hint('gyroMeasure'),
'ifTouch': Hint('ifTouch'),
'moveTank': Hint('moveTank'),
'lrPower': Hint('lrPower'),
'while': Hint('while')
}
def hint( code):
tokens = get_tokens(code)
# if code does not include mindstorms_widgets(), a student gets a hint that the robot should be somehow represented in the program
if not has_token_sequence(tokens, ['mindstorms_widgets', '(',')']):
return [{'id': 'mW_init'}]
# if code does not include connect_motor statement, a student needs to learn about how to connect the motors
if not has_token_sequence(tokens, ['connect_motor']) and not has_token_sequence(tokens, ['left']):
return [{'id': 'connectMotorLeft'}]
# if code does not include connect_motor statement, a student needs to learn about how to connect the motors
if not has_token_sequence(tokens, ['connect_motor']) and not has_token_sequence(tokens, ['right']):
return [{'id': 'connectMotorRight'}]
if not (has_token_sequence(tokens, ['connect_gyro','(']) and 'gyro' in code):
return [{'id': 'connectGyro'}]
if not (has_token_sequence(tokens, ['connect_sensor','(']) and 'touch' in code):
return [{'id': 'connectTouch'}]
if not has_token_sequence(tokens, ['reset_gyro']):
return [{'id': 'resetGyro'}]
if not has_token_sequence(tokens, ['gyro_set_mode']):
return [{'id': 'setGyroMode'}]
if not has_token_sequence(tokens, ['gyro_sensor_measure']):
return [{'id': 'gyroMeasure'}]
if not has_token_sequence(tokens, ['if','touch_sensor_measure','(']):
return [{'id': 'ifTouch'}]
if not has_token_sequence(tokens, ['move_tank']):
return [{'id': 'moveTank'}]
if not 'lr_power' in code:
return [{'id': 'lrPower'}]
if not has_token_sequence(tokens, ['while']):
return [{'id': 'while'}]
return None
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