Export lists and variables in a txt file and import them in python

Question

I am new to python and would like to export some nested lists and some variables in a .txt file in python, and to be able to retrieve these data and to import them later in python.

For instance,

my_list1 =  [[[-1, 1, 0, -1]], [[-1, 1, 0, -1]]]
my_list2 =   [[[2, 1, 1], [1, 1, 0, 2]], [[2, 1, 1, 0], [0, 2, 1, 1]]]
my_var = 3
my_var2 = 7

I tried

   with open("file.txt", "w") as f:
      for ( my_list1 , my_list2) in zip(my_list1 , my_list2 ):
         f.write("{1},{2}\n".format(my_list1 , my_list2))

but I don't know how to also export my variables with it, and how to import and retrieve each data after.

Thanks

Possible duplicate of Python save variable to file like save() in MATLAB — bendl
– bendl, Commented Nov 8, 2017 at 18:11

tkhurana96 · Accepted Answer · 2017-11-08 18:19:35Z

3

This might help:

import pickle

my_list1 =  [[[-1, 1, 0, -1]], [[-1, 1, 0, -1]]]
my_list2 =   [[[2, 1, 1], [1, 1, 0, 2]], [[2, 1, 1, 0], [0, 2, 1, 1]]]
my_var = 3
my_var2 = 7

# storing to file
with open("file.txt", 'wb') as f:
    pickle.dump((my_list1, my_list2, my_var, my_var2), f)

# loading from file
with open("file.txt", 'rb') as f:
    retrived_list1, retrived_list2, retrived_var, retrived_var2 = pickle.load(f)

print(retrived_list1 == my_list1, retrived_list2 == my_list2, retrived_var == my_var, retrived_var2 == my_var2)

Output:True True True True

answered Nov 8, 2017 at 18:19

tkhurana96

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