def execute(self):
if self.apoapsis_altitude() > self.target_apoapsis:
return
self.ap.engage()
self.ap.target_pitch_and_heading(90.0, self.target_heading)
self.vessel.control.throttle = 1.0
if (self.vessel.situation ==
self.conn.space_center.VesselSituation.pre_launch):
self.ap.target_pitch_and_heading(90, self.target_heading)
countdown_to("LAUNCH!")
self.check_staging(force=True)
else:
self.setup_staging_callback()
while self.running:
if self.check_staging():
wait()
if self.surface_altitude() < 250:
self.g_limit(2.2)
elif self.apoapsis_altitude() < 0.9 * self.target_apoapsis:
self.g_limit(2.2)
self.tip_over()
elif self.apoapsis_altitude() < self.target_apoapsis:
self.g_limit(1.0)
else:
self.vessel.control.throttle = 0.0
self.running = False
wait()
self.ap.disengage()
def slow_down(self, vessel):
notify('Slowing down...')
vessel = self.vessel
control = vessel.control
rf = vessel.orbit.body.reference_frame
flight = vessel.flight(rf)
_surface_velocity = self.conn.add_stream(getattr, flight, 'velocity')
surface_velocity = lambda: -np.array(_surface_velocity())
ap = vessel.auto_pilot
ap.engage()
ap.reference_frame = rf
ap.target_direction = surface_velocity()
ap.wait()
g = self.surface_gravity
ut, delta_v, delta_t = self.estimate_suicide_burn()
self.conn.space_center.warp_to(ut - 0.5 * delta_t)
control.throttle = 1.0
effective_twr = self.TWR() - self.surface_gravity
notify(
f'surface_altitude:{self.surface_altitude()}, vertical_speed:{self.vertical_speed()}, effective_twr:{effective_twr}'
)
while -self.vertical_speed() > 10 * effective_twr:
ap.target_direction = surface_velocity()
wait()
control.throttle = 0.0
notify(
f'surface_altitude:{self.surface_altitude()}, vertical_speed:{self.vertical_speed()}'
)
def get_friends(username):
# get or create the user
the_user = graph.find_one('User', 'screen_name', username)
if not the_user:
the_user = Node(
'User',
screen_name=username,
)
graph.create(the_user)
# get or create the friends of the user
next_cursor = -1
while next_cursor != 0:
try:
response = client.api.friends.ids.get(
screen_name=username,
count=5000,
cursor=next_cursor,
)
except TwitterRateLimitError, e:
wait(e)
else:
for user_id in response.data.ids:
followed_user, created = get_or_create_by_id(user_id)
graph.create_unique(
Relationship(the_user, "FOLLOWS", followed_user)
)
next_cursor = response.data.next_cursor
def test_deadlock(config):
"""test when two backends try to extract state of each other"""
acon1, acon2 = common.n_async_connect(config, 2)
acurs1 = acon1.cursor()
acurs2 = acon2.cursor()
while True:
acurs1.callproc('pg_query_state', (acon2.get_backend_pid(), ))
acurs2.callproc('pg_query_state', (acon1.get_backend_pid(), ))
# listen acon1, acon2 with timeout = 10 sec to determine deadlock
r, w, x = select.select([acon1.fileno(), acon2.fileno()], [], [], 10)
assert (r or w or
x), "Deadlock is happened under cross reading of query states"
common.wait(acon1)
common.wait(acon2)
# exit from loop if one backend could read state of execution 'pg_query_state'
# from other backend
if acurs1.fetchone() or acurs2.fetchone():
break
common.n_close((acon1, acon2))
def execute(self):
vessel = self.vessel
ksc = self.conn.space_center
orbit = vessel.orbit
body = orbit.body
control = vessel.control
atmosphere = body.atmosphere_depth
warp_radius = body.equatorial_radius + atmosphere
anom = orbit.true_anomaly_at_radius(warp_radius)
ut = min(orbit.ut_at_true_anomaly(anom),
orbit.ut_at_true_anomaly(-anom))
ksc.warp_to(ut - 15)
control.sas = True
control.sas_mode = control.sas_mode.retrograde
wait(5)
control.throttle = 1.0
self.setup_staging_callback()
while self.running:
self.check_staging()
if self.apoapsis_altitude() < atmosphere:
break
control.throttle = 0
# TODO: handle decoupling heat shields
while max([part.decouple_stage for part in vessel.parts.all]) > -1:
control.activate_next_stage()
control.sas = True
control.sas_mode = control.sas_mode.retrograde
def create_socket_connection(self):
n = 1
while True:
try:
wait((n - 1) * 2)
self.log.info('creating socket and connecting ... try #%s' % n)
self.socket.connect((self.ip_address, self.port))
self.log.info('socket connected to %s:%s' % (self.ip_address, self.port))
break
except Exception as ex:
self.log.critical(ex)
n += 1
if n > 3:
break
def download_and_play(name, url, path):
if os.path.isfile(path) is True:
notification('download Alert', 'The video you are trying to download already exists!')
return False
else:
print 'attempting to download and play file'
try:
print "Starting download Thread"
dlThread = DownloadAndPlayThread(url, path, name)
dlThread.start()
wait(WAITING_TIME, "Buffering")
xbmc.Player().play(path)
except:
print 'download failed'
def download_and_play(name, url, path):
if os.path.isfile(path) is True:
notification('download Alert',
'The video you are trying to download already exists!')
return False
else:
print 'attempting to download and play file'
try:
print "Starting download Thread"
dlThread = DownloadAndPlayThread(url, path, name)
dlThread.start()
wait(WAITING_TIME, "Buffering")
xbmc.Player().play(path)
except:
print 'download failed'
def main():
os.makedirs('downloads', exist_ok=True)
with open('download.list', 'r') as csvfile:
reader = csv.DictReader(csvfile, [
'download_url',
'file_name',
])
for r in reader:
url = r['download_url']
path = os.path.join('downloads', r['file_name'])
if os.path.exists(path):
print("Already downloaded {} to {}".format(url, path))
else:
wait()
print("Downloading {} to {}".format(url, path))
wget.download(url, path)
print()
def test_concurrent_access(config):
"""test when two backends compete with each other to extract state from third running backend"""
acon1, acon2, acon3 = common.n_async_connect(config, 3)
acurs1, acurs2, acurs3 = acon1.cursor(), acon2.cursor(), acon3.cursor()
query = 'select count(*) from foo join bar on foo.c1=bar.c1'
common.set_guc(acon3, 'max_parallel_workers_per_gather', 0)
acurs3.execute(query)
time.sleep(0.1)
acurs1.callproc('pg_query_state', (acon3.get_backend_pid(), ))
acurs2.callproc('pg_query_state', (acon3.get_backend_pid(), ))
common.wait(acon1)
common.wait(acon2)
common.wait(acon3)
qs1, qs2 = acurs1.fetchall(), acurs2.fetchall()
assert len(qs1) == len(qs2) == 1 \
and qs1[0][0] == qs2[0][0] == acon3.get_backend_pid() \
and qs1[0][1] == qs2[0][1] == 0 \
and qs1[0][2] == qs2[0][2] == query \
and len(qs1[0][3]) > 0 and len(qs2[0][3]) > 0 \
and qs1[0][4] == qs2[0][4] == None
common.n_close((acon1, acon2, acon3))
def get_foafs(username):
cypher = graph.cypher
# get friends of the user; i.e. mutually followed users
result = cypher.stream("MATCH ({screen_name:'%(username)s'})-->(friend)-->({screen_name:'%(username)s'}) "
"RETURN friend.id" % {'username': username})
for record in result:
friend, created = get_or_create_by_id(record['friend.id'])
friend_id = friend.properties['id']
print 'getting friends of %s' % friend_id
# get or create the friends of the friend
next_cursor = -1
while next_cursor != 0:
try:
response = client.api.friends.ids.get(
user_id=friend_id,
count=5000,
cursor=next_cursor,
)
except TwitterRateLimitError, e:
wait(e)
except:
def get_friend_details(username):
# update the friends' nodes with names and screen names
def chunks(l, n=100): # 100 is the Twitter limit
for i in xrange(0, len(l), n):
yield l[i:i+n]
cypher = graph.cypher
# get friends of the user; i.e. mutually followed users
result = cypher.execute("MATCH ({screen_name:'%(username)s'})-->(friend)-->({screen_name:'%(username)s'}) "
"RETURN friend.id" % {'username': username})
for chunk in chunks(result):
ids = ','.join([str(r['friend.id']) for r in chunk])
try:
profiles = client.api.users.lookup.post(user_id=ids, entities=False)
except TwitterRateLimitError, e:
wait(e)
else:
for profile in profiles.data:
user, created = get_or_create_by_id(profile['id'])
user.properties['name'] = profile['name']
user.properties['screen_name'] = profile['screen_name']
graph.push(user)
def apply_job(browser, job_page):
# Open job page and send application
try:
wait()
browser.get(job_page)
wait()
browser.find_elements_by_class_name("m-applyButton__button")[0].click()
wait()
browser.find_elements_by_class_name("c-applyForm__action")[0].click()
return 1
except:
output_timed_message('ERROR: Applying error')
return 0
def login(browser):
# Login to karriere.at
try:
browser.get(url_login)
wait()
browser.find_element_by_id('email').send_keys(user_login)
wait()
browser.find_element_by_id('password').send_keys(user_password)
browser.find_elements_by_class_name(
"m-userLogin__submitButton")[0].click()
wait()
if len(browser.find_elements_by_id('email')) > 0:
output_timed_message('ERROR: Wrong login/password')
return 0
return 1
except:
output_timed_message('ERROR: Login error')
return 0
def controlled_descent(self, target=None):
LANDED = self.conn.space_center.VesselSituation.landed
SPLASHED = self.conn.space_center.VesselSituation.splashed
vessel = self.vessel
control = vessel.control
control.trottle = 0
control.brakes = True
control.gear = True
control.lights = True
control.solar_panels = False
control.sas = False
lat, lon = target
# rf = vessel.surface_reference_frame
rf = vessel.orbit.body.reference_frame
flight = vessel.flight(rf)
_pos = self.conn.add_stream(getattr, flight, 'center_of_mass')
pos = lambda: np.array(_pos())
target_pos = lambda: np.array(
vessel.orbit.body.surface_position(lat, lon, rf))
_surface_velocity = self.conn.add_stream(getattr, flight, 'velocity')
surface_velocity = lambda: -np.array(_surface_velocity())
ap = vessel.auto_pilot
ap.engage()
ap.reference_frame = rf
ap.target_direction = surface_velocity()
landing_speed = 0.5
v_target = lambda: 0.2 * self.surface_altitude() + landing_speed
base_throttle = lambda: self.surface_gravity / self.TWR()
effective_twr = self.TWR() - self.surface_gravity
notify('Waiting for landing burn...')
while self.surface_altitude(
) > self.stopping_distance() + 2.0 * wait.interval * self.speed():
ap.target_direction = surface_velocity()
wait()
control.throttle = 1.0
notify('Landing burn!')
notify(f'altitude: {self.surface_altitude()}')
while self.speed() > 5 * effective_twr:
d = surface_velocity()
ap.target_direction = d / np.linalg.norm(d)
wait()
notify(f'effective_twr: {effective_twr}')
pid = PID(0.2,
0.0,
0.0,
sample_time=wait.interval,
output_limits=(-1.0, 1.0))
notify('Entering controlled descent...')
while self.situation() not in [LANDED, SPLASHED]:
altitude = self.surface_altitude()
base = base_throttle()
target = v_target()
actual = -self.vertical_speed()
pid_input = target - actual
pid_output = pid(pid_input)
# notify({
# 'altitude': altitude,
# 'target': target,
# 'actual': actual,
# 'input': pid_input,
# 'output': pid_output,
# 'pos': pos(),
# 'target_pos', target_pos,
# })
notify(
f'altitude:{altitude:.2f}, target:{target:.2f}, actual:{actual:.2f}, input:{pid_input:.2f}, output:{pid_output:.2f}, pos: {pos()}, target: {target_pos()}'
)
control.throttle = base + pid_output
if self.surface_altitude() < 25:
ap.target_direction = pos()
else:
d = surface_velocity()
ap.target_direction = d
wait()
control.throttle = 0
ap.disengage()
notify('done')
def start():
mark("welcome")
oled_page("Hi " + name + "!", "The cursor at", "the bottom right",
"means 'press the'", "black button'")
wait()
oled_page("I'm Pico!", "I'm so happy to", "meet you! Joel",
"thinks you're", "awesome.")
wait()
oled_page("Getting Hints", "If you get stuck", "and need a hint",
"use Slack", "#secret-pico")
wait()
oled_page("Let's begin!", "Let's move this", "convo to your",
"laptop, ok?")
wait()
oled_page("Type in Shell:", "screen", " /dev/tty.usb*", "",
"& press RETURN")
wait()
oled_page("Connect to me!", "", "I'll be waiting", "for you there :)")
wait(msg="Press black button")
oled_page("Serial output")
print("""
Hi again! It's me, Pico!
I'm a gift wrapped in a puzzle wrapped in an educational
experience. Joel made me just for you and your cohort-mates.
I've got lots to show you, plus a reward at the end. But
first, like any good hero, you have to overcome some challenges.
Don't give up too easily! Part of a challenge is figuring it out.
But, remember, if you get stuck, you ask in #pico-secret.
""")
input("Press RETURN > ")
print("""
Along the way, I have some learning material for you. For
example, you should read:
{url}
""".format(url=url('pico')))
input("Press RETURN when ready > ")
print("""
I can be programmed in lots of languages but, of course,
Joel programmed me in Python. It's actually a version of Python
called MicroPython, meant to be run on tiny machines like me.
It has almost all of the normal language features, plus some
of the standard library. We'll be using it throughout.
You'll start each section by importing a Python module,
and then running it's `start()` function. You can always
revisit and earlier section by importing it. Of course, you
won't know all the future sections, so you can't jump ahead :).
Let's begin! I'm going to return you to my Python shell.
When you're ready, you should type:
>>> import begin
>>> begin.start()
See you there!
""")
import common, opcodes, cleo, script
script.name("QuickTeleport")
script.author("Grinch_")
script.desc("Teleport to marker location pressing X+Y")
script.version("1.0")
while True:
common.wait(0)
if common.key_pressed(0x58) and common.key_pressed(0x59):
while common.key_pressed(0x58) and common.key_pressed(0x59):
common.wait(25)
coords = cleo.get_target_marker_coords()
handle = opcodes.get_player_char(0)
opcodes.do_fade(50, 0)
opcodes.set_char_coordinates(handle, coords[0], coords[1],
coords[2] + 100)
opcodes.freeze_char_position_and_dont_load_collision(handle, True)
common.wait(500)
opcodes.set_char_coordinates(handle, coords[0], coords[1], coords[2])
opcodes.freeze_char_position_and_dont_load_collision(handle, False)
opcodes.do_fade(50, 1)
def execute(self):
ksc = self.conn.space_center
vessel = self.vessel
vessel.control.rcs = True
rf = vessel.surface_reference_frame # x: up, y: north, z: east
ap = vessel.auto_pilot
ap.engage()
ap.reference_frame = rf
body = vessel.orbit.body
surface_gravity = body.surface_gravity
tick = 0.01
r = body.equatorial_radius
degrees_per_meter = 180 / r / math.pi
lat0 = self.latitude() + 50 * degrees_per_meter
lat1 = lat0 + 10 * degrees_per_meter
lon0 = self.longitude()
lon1 = lon0 + 20 * degrees_per_meter
target = lambda: None
if not self.TWR():
vessel.control.activate_next_stage()
def create_lateral_control():
Kp = 0.2
Kd = 3.0 * Kp
lateral_acc = 0.5 * surface_gravity
control = CascadeControl(
PID(
Kp=Kp,
Kd=Kd,
sample_time=tick,
),
PID(
Kp=1.0,
Kd=0.0,
output_limits=(-lateral_acc, lateral_acc),
sample_time=tick,
))
control.controls[0] = lambda *x: 0
return control
controllers = [
PID(1.0, 0.0, 1.5), # up/down
create_lateral_control(), # N/S
create_lateral_control(), # E/W
]
error = [[], [], []]
def update_throttle():
delta_h = target.altitude - self.surface_altitude()
twr = self.TWR()
err = delta_h
acc = surface_gravity + controllers[0](-err)
throttle = acc / twr
error[0].append(err)
return throttle
def force_vector():
p = -np.array(target.pointer)
v = np.array(target.relative_velocity)
scale = min(1.0, max(target.distance, 2.0 * target.speed))
scale = 1.0
vec = np.array([
surface_gravity, scale * controllers[1](p[1], v[1]),
scale * controllers[2](p[2], v[2])
])
error[1].append(ap.error)
error[2].append(v[1])
return vec
target.altitude = 50.0
target.latitude = self.latitude()
target.longitude = self.longitude()
while vessel.met < 8.0:
vessel.control.throttle = update_throttle()
ap.target_direction = (1, 0, 0)
wait(tick)
while not self.abort():
if self.brakes():
target.altitude = 100.0
target.latitude = lat1
target.longitude = lon1
else:
target.altitude = 50
target.latitude = lat0
target.longitude = lon0
target.position = body.position_at_altitude(
target.latitude, target.longitude, self.mean_altitude(),
body.reference_frame)
target.reference_frame = body.reference_frame
target.pointer = ksc.transform_position(target.position,
target.reference_frame, rf)
target.distance = np.linalg.norm(target.pointer)
target.relative_velocity = -np.array(
ksc.transform_velocity(target.position,
(0, 0, 0), target.reference_frame, rf))
target.speed = np.linalg.norm(target.relative_velocity)
notify(target.distance, target.speed)
F = force_vector()
ap.target_direction = F
scaled_force = np.linalg.norm(F) / surface_gravity
vessel.control.throttle = update_throttle() * scaled_force
wait(tick)
vessel.control.throttle = 0
err1 = np.array(error[1])
err2 = np.array(error[2])
t = np.arange(len(err1))
plt.plot(t, np.zeros_like(t), label='zero')
plt.plot(t, np.log(np.abs(err1) + 1.0), label='log err1')
plt.plot(t, err1, label='raw err1')
plt.plot(t, np.log(np.abs(err2) + 1.0), label='log err2')
plt.plot(t, err2, label='raw err2')
plt.xlabel('time')
plt.ylabel('error')
plt.legend()
plt.show()
wait()
import common, opcodes, hud, script
script.name("CreateCar")
script.author("Grinch_")
script.desc("Spawns a car when Left Shift is pressed")
script.version("1.0")
while True:
common.wait(0)
if common.key_pressed(0xA0):
while common.key_pressed(0xA0):
common.wait(0)
handle = opcodes.get_player_char(0)
if opcodes.is_char_in_any_car(handle):
hud.set_help_message("Already in a car", False, False, False)
else:
opcodes.request_model(400)
opcodes.load_all_models_now()
coord = opcodes.get_char_coordinates(handle)
car : int = opcodes.create_car(400, coord[0], coord[1], coord[2])
opcodes.warp_char_into_car(handle, car)
opcodes.mark_model_as_no_longer_needed(400)
def execute_next_node(conn):
'''
This is the actually interesting function in this script!
Executes the Next Maneuver Node for the vessel provided.
If you just open and run this file, it will execute a node and exit.
You can also include this file into your own script with the line
from node_executor import execute_next_node
at the top of your script, and then anytime you want to execute a node
you just have to call (execute_next_node(conn) passing it the active
KRPC connection as a parameter.
I'm also demonstrating two different ways to point the vessel with the
autopilot. One relies on the vessel having SAS Node holding capabilty,
the other uses the KRPC built-in auto-pilot. The one built into
KRPC can require some tuning depending on your vessel... but works on
any vessel regardless of pilot skill/probe core choice!
'''
space_center = conn.space_center
vessel = space_center.active_vessel
ap = vessel.auto_pilot
# Grab the next node if it exists
try:
node = vessel.control.nodes[0]
except Exception:
return #Fail silently but gracefully if there was no node to execute
# Orient vessel to the node
################## One Way To Orient Vessel!##############
rf = vessel.orbit.body.reference_frame
ap.reference_frame = rf
ap.engage()
ap.target_direction = node.remaining_burn_vector(rf)
ap.wait()
################## Another Way To Orient Vessel!########
#ap.sas = True
#time.sleep(.1)
#ap.sas_mode = vessel.auto_pilot.sas_mode.maneuver
#ap.wait()
# Calculate the length and start of burn
m = vessel.mass
isp = vessel.specific_impulse
dv = node.delta_v
F = vessel.available_thrust
G = 9.81
burn_time = (m - (m / math.exp(dv / (isp * G)))) / (F / (isp * G))
ap.reference_frame = rf
ap.engage()
ap.target_direction = node.remaining_burn_vector(rf)
ap.wait()
# TODO: check fuel level for potential staging
# Warp until burn
space_center.warp_to(node.ut - (burn_time / 2.0) - 5.0)
ap.engage()
ap.target_direction = node.remaining_burn_vector(rf)
while node.time_to > (burn_time / 2.0):
pass
# Actually Burn
vessel.control.throttle, acc = thrust_controller(vessel,
node.remaining_delta_v)
while node.remaining_delta_v > acc * wait.interval and node.remaining_delta_v > 0.2:
ap.target_direction = node.remaining_burn_vector(rf)
vessel.control.throttle, acc = thrust_controller(
vessel, node.remaining_delta_v)
wait()
# Finish Up
ap.disengage()
vessel.control.throttle = 0.0
node.remove()
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
__author__ = 'ipetrash'
import traceback
from common import init_db, append_crash_statistics_db, wait
init_db()
while True:
try:
append_crash_statistics_db()
wait(hours=12)
except Exception as e:
print('ERROR: {}:\n\n{}'.format(e, traceback.format_exc()))
wait(minutes=5)
def run_tpcds(config):
"""TPC-DS stress test"""
TPC_DS_EXCLUDE_LIST = [] # actual numbers of TPC-DS tests to exclude
TPC_DS_STATEMENT_TIMEOUT = 20000 # statement_timeout in ms
print('Preparing TPC-DS queries...')
queries = []
for query_file in sorted(
os.listdir(
'tmp_stress/tpcds-result-reproduction/query_qualification/')):
with open(
'tmp_stress/tpcds-result-reproduction/query_qualification/%s' %
query_file, 'r') as f:
queries.append(f.read())
acon, = common.n_async_connect(config)
pid = acon.get_backend_pid()
print('Starting TPC-DS queries...')
timeout_list = []
bar = progressbar.ProgressBar(max_value=len(queries))
for i, query in enumerate(queries):
bar.update(i + 1)
if i + 1 in TPC_DS_EXCLUDE_LIST:
continue
try:
# Set query timeout to TPC_DS_STATEMENT_TIMEOUT / 1000 seconds
common.set_guc(acon, 'statement_timeout', TPC_DS_STATEMENT_TIMEOUT)
# run query
acurs = acon.cursor()
acurs.execute(query)
# periodically run pg_query_state on running backend trying to get
# crash of PostgreSQL
MAX_FIRST_GETTING_QS_RETRIES = 10
PG_QS_DELAY, BEFORE_GETTING_QS_DELAY = 0.1, 0.1
BEFORE_GETTING_QS, GETTING_QS = range(2)
state, n_first_getting_qs_retries = BEFORE_GETTING_QS, 0
while True:
result, notices = common.pg_query_state(config, pid)
# run state machine to determine the first getting of query state
# and query finishing
if state == BEFORE_GETTING_QS:
if len(result
) > 0 or common.BACKEND_IS_ACTIVE_INFO in notices:
state = GETTING_QS
continue
n_first_getting_qs_retries += 1
if n_first_getting_qs_retries >= MAX_FIRST_GETTING_QS_RETRIES:
# pg_query_state callings don't return any result, more likely run
# query has completed
break
time.sleep(BEFORE_GETTING_QS_DELAY)
elif state == GETTING_QS:
if common.BACKEND_IS_IDLE_INFO in notices:
break
time.sleep(PG_QS_DELAY)
# wait for real query completion
common.wait(acon)
except psycopg2.extensions.QueryCanceledError:
timeout_list.append(i + 1)
common.n_close((acon, ))
if len(timeout_list) > 0:
print(
'\nThere were pg_query_state timeouts (%s s) on queries:' %
TPC_DS_STATEMENT_TIMEOUT, timeout_list)
def get_pid(logfile):
# Wait until the script has written its PID to the logfile
wait(lambda: os.path.exists(logfile), timeout=5)
with open(logfile, 'r') as f:
return int(f.read())
led.on()
try:
step = uio.open("/step.txt").read().strip()
except:
step = "welcome"
if step == "welcome":
# they're just starting, so move for them
import welcome
welcome.start()
else:
oled_page(
"Welcome back!",
"Connect using",
"screen",
" /dev/tty.usb*")
wait("Press black button")
print("""
Welcome back.
You can pick up where you were with:
>>> import {step}
>>> {step}.start()
(if you know other step names, feel free to use them)
""".format(step=step))