Printing a list within a list as a string on new lines

Question

I'm really struggling with this issue, and can't seem to find an answer anywhere. I've got a text file which has name of the station and location, the task is to print out the names of the stations all underneath each other in order and same for the locations.
In my text file the names of the stations are always made up of two words and the location is 3 words.

text_file = "London Euston 12 London 56, Aylesbury Vale 87 Parkway 99, James Cook 76 University 87, Virginia Water 42 Surrey 78"

Desired outcome would be:

Stations:
London Euston
Aylesbury Vale
James Cook
Virginia Water

Locations:
12 London 56
87 Parkway 99
76 University 87
42 Surrey 78

my current code:

replaced = text_file.replace(","," ")
replaced_split = replaced.split()

i = 0
b = 2
stations = []
locations = []

while b < len(replaced_split):
   locations.append(replaced_split[b:b+3])
   b += 5

while i < len(replaced_split):
   stations.append(replaced_split[i:i+2])
   i += 5

for x in range(len(stations)):
   print(stations[x])

for y in range(len(locations)):
   print(dates[y])

The outcome I'm receiving is printing lists out:

['London', 'Euston']
['Aylesbury', 'Vale']
['James', 'Cook']
['Virginia', 'Water']
['12', 'London', '56']
['87', 'Parkway', '99']
['76', 'University', '87']
['42', 'Surrey', '78']

You could use " ".join() to turn the lists into strings.

Fractalism
– Fractalism

2023-01-23 12:09:21 +00:00
Commented Jan 23, 2023 at 12:09 — Fractalism
– Fractalism, Commented Jan 23, 2023 at 12:09

Jamiu S. · Accepted Answer · 2023-02-20 09:52:21Z

This is a simple a straight forward approach using for-loop instead of while loop.
What the code does: It splits your string into substrings, where every substring is separated by comma and space. After that it splits those substrings again by space then joins the first two elements of each substring to create station and appends it to the stations list, and finally joins the rest of the substring leaving the first two elements as the location and appends that to the locations list. Now you loop the lists to print their elements

stations = []
locations = []

for char in text_file.split(", "):
    parts = char.split(" ")
    stations.append(" ".join(parts[:2]))
    locations.append(" ".join(parts[2:]))


print("Stations:")
for station in stations:
    print(station)

print("\nLocations:") 
for location in locations:
    print(location)

You can also choose to unpack stations and locations lists instead of using a traditional for-loop to print elements one at a time:

print("Stations:")
print(*stations, sep='\n')

print("\nLocations:") 
print(*locations, sep='\n')

Stations:
London Euston
Aylesbury Vale
James Cook
Virginia Water

Locations:
12 London 56
87 Parkway 99
76 University 87
42 Surrey 78

Aharon Sambol · Accepted Answer · 2023-01-23 12:09:17Z

1

Instead of simply printing the list try joining the list first, like so:

print(' '.join(stations[x]))

You could even shorten the whole loop from this:

for x in range(len(stations)):
   print(stations[x])

to this:

print('\n'.join(' '.join(station) for station in stations))

answered Jan 23, 2023 at 12:09

Aharon Sambol

1759 bronze badges

Comments

Fractalism · Accepted Answer · 2023-01-23 12:18:50Z

Instead of manually processing the string, regular expressions can come in handy here. First split the text_file to one line per input, then use two capturing groups to fetch the station and location of each input. We store the stations and locations in two arrays and print them out at the end.

import re

text_file = "London Euston 12 London 56, Aylesbury Vale 87 Parkway 99, James Cook 76 University 87, Virginia Water 42 Surrey 78"

prog = re.compile(r'(\w+\s\w+)\s(\d+\s\w+\s\d+)')
lines = text_file.split(', ')
stations = []
locations = []

for line in lines:
    result = prog.match(line)
    stations.append(result.group(1))
    locations.append(result.group(2))

print("Stations:")
for s in stations:
    print(s)
print("\nLocations")
for l in locations:
    print(l)

you colud use re.finditer to shorten this a bit: for result in prog.finditer(text_file):
@AharonSambol Nice one, I was not aware of the finditer method.

Tomerikoo · Accepted Answer · 2023-01-23 12:29:39Z

What you're doing works and arranges the data like you want. You just need to print it properly, by joining the lists. In your existing code, if you change to:

print(' '.join(stations[x]))

and:

print(' '.join(dates[y]))

You will get your desired output.

But you could simplify a bit the logic if the strings are always structured like you say:

text_file = "London Euston 12 London 56, Aylesbury Vale 87 Parkway 99, James Cook 76 University 87, Virginia Water 42 Surrey 78"
places = text_file.split(', ')

stations, locations = [], []
for place in places:
    parts = place.split()
    stations.append(' '.join(parts[:2]))
    locations.append(' '.join(parts[2:]))

print("Stations:")
for station in stations:
    print(station)

print("Locations:")
for location in locations:
    print(location)

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