Python: Fill data in a list in a tuple-CodePudding

I need to create a function that reads the data given and creates a list that contains tuples each of which has as its first element the name of the airport and as its second and third its geographical coordinates as float numbers.

airport_data = """
Alexandroupoli 40.855869°N 25.956264°E
Athens 37.936389°N 23.947222°E
Chania 35.531667°N 24.149722°E
Chios 38.343056°N 26.140556°E
Corfu 39.601944°N 19.911667°E
Heraklion 35.339722°N 25.180278°E"""

airports = []

import re
airport_data1 = re.sub("[°N@°E]","",airport_data)
        
def process_airports(string):
    airports_temp = list(string.split())
    airports = [tuple(airports_temp[x:x 3]) for x in range(0, len(airports_temp), 3)]
    return airports

print(process_airports(airport_data1))

This is my code so far but I'm new to Python, so I'm struggling to debug my code.

CodePudding user response：

If you want the second and third element of the tuple to be a float, you have to convert them using the float() function. One way to do this is creating a tuple with round brackets in your list comprehension and convert the values there:

    def process_airports(string):
        airports_temp = string.split()
        airports = [(airports_temp[x], float(airports_temp[x 1]), float(airports_temp[x 2])) for x in range(0, len(airports_temp), 3)]
        return airports

This yields a pretty unwieldy expression, so maybe this problem could be solved more readable with a classical for loop.

Also note that slpit() already returns a list. Further remark: If you just cut off the letters from coordinates this might come back to bite you when your airports are in different quadrants.

CodePudding user response：

You need to take in account N/S, W/E for longitude and latitude. May be

def process_airports(string):
    airports = []
    for line in string.split('\n'):
        if not line: continue
        name, lon, lat = line.split()
        airports.append((name,
                         float(lon[:-2]) * (1 if lon[-1] == "N" else -1),
                         float(lat[:-2]) * (-1 if lat[-1] == "E" else 1)
                       ))
    return airports
        
>>> process_airports(airport_data1)
[('Alexandroupoli', 40.855869, -25.956264), ('Athens', 37.936389, -23.947222), ('Chania', 35.531667, -24.149722), ('Chios', 38.343056, -26.140556), ('Corfu', 39.601944, -19.911667), ('Heraklion', 35.339722, -25.180278)]

I prefered the double split to put in evidence the differences lines/tuple elements