I have 2 lists: latitude and longitude, which I'd like to format into an object in the following format:
coordinates = (-33.89419, 151.19449), (-33.66061, 151.25468), ...
How do I go about formatting this? It has to be the first latitude item with the first longitude items, and so forth. Thank you.
latitude
-33.89419,
-33.66061,
-33.89875
longitude
151.19449,
151.25468,
151.28507,
151.21634
Many thanks.
You can combine both the latitude and longitude lists into a single list element-wise using zip. To get to the format that you wanted you can do the following
>>> str(list(zip(a,b)))[1:-1]
'(-33.89419, 151.19449), (-33.66061, 151.25468), (-33.89875, 151.28507)'
zip object to a list or tuple for accessing items
tuple); a reasonable alternative if you're printing here would be print(*zip(a, b), sep=", ") (which avoids the need for slicing to strip off the list repr's brackets too.You can do:
coordinates = []
for x in range(len(latitude)):
coordinates.append([latitude[x], longitude[x]])
Note: It has been assumed that the number of latitude coordinates is same as the number of longitude coordinates.
zip is definitely the more Pythonic way to go here. Iterating over ranges and indexing is both surprisingly slow and error-prone (e.g. in this case, where you just have to assume the lists are the same length, rather than stopping early as in zip, or providing a filler value, as in itertools.zip_longest). This is basically a verbose, slower, more fragile version of coordinates = list(zip(latitude, longitude))
zipdoesn't give you that, the answer that formats its results into a string does that.zipactually gives youtuples of the exact form requested, you just stringify them one by one and you get the desired result, e.g.', '.join(str(pair) for pair in zip(latitude, longitude))if you want a string, or justlist(zip(latitude, longitude))if you want alistoftuplepairs.