Get array list from file

Question

I have wrote a list in to a file, how can i get it back as old array list.

list looks like this

['82294', 'ABDUL', 'NAVAS', 'B', 'M', 'MSCS', 'CUKE', '30', 'Kasargod', 'CU', 'Kerala', 'Online', 'PG-QS-12', '15', 'June,', '2013', '12.00', 'Noon', '-', '02.00', 'PM\n', '29']

['82262', 'ABDUL', 'SHAFWAN', 'T', 'H', 'MSCS', 'CUKE', '30', 'Kasargod', 'CU', 'Kerala', 'Online', 'PG-QS-12', '15', 'June,', '2013', '12.00', 'Noon', '-', '02.00', 'PM\n', '29']

when i read the file, it does consider as a string list, for eg:

consider first list:

var[0][0] should be 82294 not '

i am a python noob,

Are you able to re-serialize the initial array using pickle? — J0HN
– J0HN, Commented Jul 10, 2013 at 18:55
Have you serialized or pickled the list before putting it in file or just copied and put it as it is in a file? — Akshar Raaj
– Akshar Raaj, Commented Jul 10, 2013 at 18:57
eval can achieve the goal though it is not safe. Re-serialize using pickle is a better choice. — zhangyangyu
– zhangyangyu, Commented Jul 10, 2013 at 18:59

Ayman · Accepted Answer · 2013-07-10 19:01:25Z

1

You can read the file line by line. For each line you can then eval it, or use json.loads to unpack it.

answered Jul 10, 2013 at 19:01

Ayman

11.6k18 gold badges70 silver badges94 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Ashwini Chaudhary Over a year ago

ast.literal_eval is better and safer.

Mathieu Marques · Accepted Answer · 2013-07-12 08:14:33Z

0

Why couldn't you just do it by hand ? You'll need to either be sure of the safety of the string or adapt the list comprehension to your needs.

foo = "['4','8','15','16','23','42']"
bar = [token.strip("'") for token in foo[1:-1].split(',')]

edited Jul 12, 2013 at 8:14

answered Jul 10, 2013 at 20:08

Mathieu Marques

1,74817 silver badges36 bronze badges

Comments

Kevin Brechbühl · Accepted Answer · 2014-03-15 21:00:02Z

0

firstline=File.readline()  #read one line
firstlist=eval(firstline)

now you got first list

['82294', 'ABDUL', 'NAVAS', 'B', 'M', 'MSCS', 'CUKE', '30', 'Kasargod', 'CU', 'Kerala', 'Online', 'PG-QS-12', '15', 'June,', '2013', '12.00', 'Noon', '-', '02.00', 'PM\n', '29']

by using a loop you can get all the list back

eval() is a function it will conver string to python expression

edited Mar 15, 2014 at 21:00

Kevin Brechbühl

4,7153 gold badges26 silver badges47 bronze badges

answered Mar 15, 2014 at 20:40

Abilashov

1

Collectives™ on Stack Overflow

Get array list from file

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related