I have modelled which starts running once drivers and stations are assigned to
it. Otherwise, it doesn’t run, really don’t care if passengers are boarded or
not at this moment. :) I think this program can help me to introduce to the
Python async programming domain.
Here is my program:
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# train.py
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
import time
import random
from user import User
class NotReadyToDeparture(Exception):
pass
class Train:
def __init__(self, name, category):
self.name = name
self.category = category
self.__drivers = []
self.__stations = []
@property
def drivers(self):
return self.__drivers
@drivers.setter
def drivers(self, coachmen):
self.__drivers = coachmen
@property
def stations(self):
return self.__stations
@stations.setter
def stations(self, places):
self.__stations = places
def next_stoppage(self):
return self.stations[0]
def run(self):
total_run_time = 0
if len(self.drivers) == 0:
raise NotReadyToDeparture('Drivers are not yet boarded')
if len(self.stations) == 0:
raise NotReadyToDeparture('Stoppage stations are not yet scheduled')
for station in range(len(self.stations[:])):
run_time_to_next_stoppage = random.randint(2, 6)
time.sleep(run_time_to_next_stoppage)
total_run_time += run_time_to_next_stoppage
print("Train Reached at {0} in {1}
seconds".format(self.stations.pop(0), run_time_to_next_stoppage))
print(f"Train {self.name} is reached the destination in
{total_run_time} seconds.")
if __name__ == "__main__":
train = Train("Digha Express", "Express")
train.drivers = [
User(f_name="Manish", l_name="Jha"),
User(f_name="Deepak", l_name="Das")
]
train.stations = [f'Station {letter}' for letter in ['A', 'B', 'C', 'D']]
train.run()
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# user.py
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
class User:
def __init__(self, f_name, l_name):
self.f_name = f_name
self.l_name = l_name
def full_name(self):
return f"{self.f_name} {self.l_name}”
Drivers are modelled as users. When I do call the `run` method it behaves as:
Train Reached at Station A in 4 seconds
Train Reached at Station B in 4 seconds
Train Reached at Station C in 3 seconds
Train Reached at Station D in 4 seconds
Train Digha Express is reached the destination in 15 seconds.
What I am looking for is that once I do call train.run() I get the control
back, and keep querying what the next stoppage is. something like this:
train.run()
while len(train.stations) is not 0:
print(f"Next stoppage is {train.stations[0]}")
How should I modify this current program to meet my goal?
Thanks,
Arup Rakshit
a...@zeit.io
--
https://mail.python.org/mailman/listinfo/python-list
