python - Read first N lines of a file in a 2d list. Its not same as for 1d case -


i have following type of data in text file. 

15  1   23  0   39 -1   71 -1   79  1   95  1   127 -2   151  2   183  1   191 -1   239  0   247  3

i want create 2d list text file follows. able code given below following result

[[15,  1], [23,  0],  [39, -1],   [71, -1],   [79,  1], [95,  1],  [127, -2],   [151,  2],   [183,  1],  [191, -1],   [239, 0],   [247, 3]]

the problem file contains millions of such data. do copy first 1000 lines @ time? how can add conditional statement code.

with open("path.text") file:     r = [[int(x) x in line.split()] line in file]

here way of doing that, not sure if it's best.

with open("test2.txt") file:     r = []     while len(r) < 1000:         r.append([int(x) x in file.readline().split()])

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