CODEWITHSUNDEEP
pythonpython-3.x
user10430117
user10430117

Reputation:

How to calculate the position difference between 2 values in a list

Train_stations = [ "Perrache", "Ampere", "Bellecour", "Cordeliers", "Louis", "Massena" ]

I started this : 

start_station = input("Where are you now?")

ending_station = input("Where would you like to go,")


final = range(start_station) - range(ending_station)

print(final)

It does not work because apparently I can not user range with this type of value..

Upvotes: 1

Views: 57

Answers (2)

vash_the_stampede
vash_the_stampede

Reputation: 4606

If the goal is to get the distance between station indexes you can simply use .index() and take the abs() of the difference.

train_stations = [ "Perrache", "Ampere", "Bellecour", "Cordeliers", "Louis", "Massena" ]

start_station = input("Where are you now: ")
ending_station = input("Where would you like to go: ")

final = abs(train_stations.index(start_station) - train_stations.index(ending_station))
print(final)
# Perrache Bellecour = > 2

Upvotes: 1

Patrick Artner
Patrick Artner

Reputation: 51643

How to get the index-difference of things inside a list: use the index() method : 

Train_stations = [ "Perrache", "Ampere", "Bellecour", "Cordeliers", "Louis", "Massena" ]

start_station = ""
ending_station = ""

while start_station not in Train_stations:
    print("Possible inputs: ", Train_stations)
    start_station = input("Where are you now?")

while ending_station not in Train_stations:
    print("Possible inputs: ", Train_stations)
    ending_station = input("Where would you like to go?")

idx_start = Train_stations.index(start_station)
idx_end = Train_stations.index(ending_station)

print("The stations are {} stations apart.".format ( abs(idx_start-idx_end)))

Output:

Possible inputs:  ['Perrache', 'Ampere', 'Bellecour', 'Cordeliers', 'Louis', 'Massena']
Where are you now?Ampere 
Possible inputs:  ['Perrache', 'Ampere', 'Bellecour', 'Cordeliers', 'Louis', 'Massena']
Where would you like to go?Perrache
The stations are 1 stations apart.

Upvotes: 2

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