如何读取存储在Python文本文件中的integer列表数组？

Question

I wrote a text file that contains list of integers like below

cords = [[385, 24], [695, 32], [1010, 106], [1122, 245]]
f = open('ref_points.txt', 'w')
f.write(str(cords))
f.close()

I want to read back this text file and get the list of integers. I know when we read contents, it is str, and need processing to store in list. I would like to know if there is any better and efficient way of doing it.

Thanks

Answer 1

You can use the pickle module and store the data as binary data, this way you have to not perform any type conversions. pickle already comes with python so you do not have to install anything either.

import pickle
coords = [[385, 24], [695, 32], [1010, 106], [1122, 245]]
f = open("points.bin", "wb")
pickle.dump(coords, f);
f.close();

# you can read it like this
f = open("points.bin", "wb")
coords = pickle.load(f) # here coords is a list so you do not have to convert anything
f.close()

also as @Marcin_Orlowski mentioned in the comments, a better way to open files will be to do so:

with open("somefile.txt") as f:
    # now you can use f for the file

this way you dont have to call f.close() either.