Read a file into an array python

It looks like this question should be rephrased as how to read a csv file into a list in Python. But I defer to the OP's original intentions over 4 years ago which I don't know. Related, likely duplicate of: stackoverflow. Does this answer your question? How to convert comma-delimited string to list in Python? In fact, looking at the top answer, this is a duplicate of stackoverflow. Add a comment. Active Oldest Votes. Achrome Achrome 7, 14 14 gold badges 33 33 silver badges 45 45 bronze badges.

I think that this answer could be bettered If you consider a multiline. I'd like to add that, the above problem notwistanding, this procedure collapses data from individual rows in a single mega-list, usually not what I want when processing a record-oriented data file.

Thiru Thiru 2, 7 7 gold badges 34 34 silver badges 49 49 bronze badges. I need this too. I noticed on a Raspberry Pi that numpy works really slow.

For this application I reverted to open a file and read it line by line. This is useful for specifying format too, via dtype : data-type parameter. But I did not see a way to specify format for it. It was reading floats from my file, whereas I needed string. Thanks Thiru for showing loadtxt.

So you want to create a list of lists Just use the csv module This question is asking how to read the comma-separated value contents from a file into an iterable list: 0,0,,0,53,1,0,, The easiest way to do this is with the csv module as follows: import csv with open 'filename.

No,Students,Marks 1,1,30 2,2,45 3,7,50 4,5,60 5,8, Data after skipping the header row [[ 1. Data with string type [['1' '1' '30'] ['2' '2' '45'] ['3' '7' '50'] ['4' '5' '60'] ['5' '8' '66']]. Data with modified column 1 [[ 1 10 2] [ 2 40 5] [ 3 70 8] [ 4 11] [ 5 14]].

Viewed k times. ThinkingStiff Add a comment. Active Oldest Votes. Rushy Panchal Rushy Panchal Just open the file and use the readlines function: with open 'topsites. In python you can use the readlines method of a file object.

Call readline repeatedly and return a list of the lines so read. The optional size argument, if given, is an approximate bound on the total number of bytes in the lines returned. Ashwini Chaudhary Ashwini Chaudhary k 51 51 gold badges silver badges bronze badges.