Importing coordinates from CSV - Python

Question

I am new to python and i am trying to import a set of x,y coordinates from csv into python.

currently my script looks as below:

with open ('filename.csv') as csvfile:
    data = list(tuple(rec) for rec in csv.reader(csvfile, delimiter= ","))

this provides me with a list of coords as below (when printed):

[('1', '2'), ('5', '6'), ('4', '4'), ('8', '9')]

However i need the output to look as below so that it can be passed successfully into a point in polygon test.

[(1, 2), (5, 6), (4, 4), (8, 9)]

Can anyone recommend how i would change my script to achieve the result above?

Answer 1

Many ways to do it, but I think this is the shortest (when using the csv module, with just a open alone it could be shorter):

with open('filename.csv') as csvfile:
    data = [(int(x), int(y)) for x, y in csv.reader(csvfile, delimiter= ',')]

Answer 2

import csv

with open('coords.csv', 'rb') as csvfile:
    data = [tuple(map(int, row)) for row in csv.reader(csvfile)]

print data

You could also do it incrementally using a generator function and avoid creating a huge list (unless that's your goal):

def get_data(filename):
    with open(filename, 'rb') as csvfile:
        for x, y in csv.reader(csvfile):
            yield int(x), int(y)

print list(get_data('coords.csv'))

Either way, this would be the output:

[(1, 2), (5, 6), (4, 4), (8, 9)]

Answer 3

试试这个：

[(int(x), int(y)) for x, y in l]

Answer 4

我怎样才能使每个坐标都像这样排成一行：1.（1,2）2.（3,4）3.（4,5）我希望它们全部独立，因此可以迭代公式