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Questions tagged [readlines]

This tag refers to the `readlines` method available on file objects in Python.

The method's schematics are below:

readlines([size:int]) -> list of strings, each a line from the file.

readlines calls the readline method repeatedly and returns a list of the lines so read. The size argument, if supplied, sets an approximate bound on the total number of bytes in the lines returned.

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Python: readlines()-method creates empty lists

I'm trying to parse items from a text file with lines of text separated by semicolons like this: 4037;HKO_2005;OBJECT-ORIENTED PROGRAMMING ;18.12.2011;5 4037;HKO_2009;DATABASES I …
jonraem
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Ruby find a string in a text file and output the line it's found on

I need to add the functionality to output the entire line a string is found on. So here's the code I have working so far. if type == "asa" if File.readlines(file).grep(/http server enabled/).any? $httpserver_failures.push(file) …
Darkmatter5
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Groovy Reader HashSet on readLines() returns out of order

I'm VERY newb at Groovy (and most back end.) I'm typically a JS developer, so bear with me. I have a static .txt file that's holding a manifest, one item per line: asdf/asdf/rewer.js asdf/asdf/opuio.js asdf/asdf/rnieo.js asdf/asdf/tewoe.js I have…
Randy Hall
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Open text file, print new lines only in python

I am opening a text file, which once created is constantly being written to, and then printing this out to a console any new lines, as I don't want to reprint the whole text file each time. I am checking to see if the file grows in size, if it is,…
speedyrazor
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Getting values from file if match found for lines with same id in Python

I have a file with lines of data. Each line starts with an id, followed by fixed set of attributes separated by comma.…
Cryssie
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Python reading and printing text file

I am reading in a text file and printing the contents, but am getting the below result, instead of line breaks, etc, which when opening the text file I can see, it is printing out \n along with other characters. How do I change the printing to…
speedyrazor
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How to compare two text files with value in ruby

I have two text file, and they have one same field(pet). I want to combine two file and output a new file contain three fields(owner pet buyer). My code is mainly depends on if both file have the same pet(name and number of pets) than I will add the…
Michael
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How can I get readlines() to ignore the EOF 0x1A character?

I am writing a Python script that will take STDIN from TextWrangler and do something to it on a line by line basis. In Textwrangler, I combine multiple text files using drag and drop. Problem is that the documents retain the ^Z (0x1A) character,…
Paul Carlin
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R, readLines, strsplit and grep

I am trying to read a random text file one line at a time. Then split the line into "words" and perform some regex on each word, like finding all word that start with "w". After the following like code snippet I get: while (length(oneLine <-…
user2970161
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Remove repeating lines of characters when reading text files in python?

I am reading a text file which was copied from a CSV file. When I read the file in python, I get a ton of unnecessary repeating lines as seen below. How can i strip away those three unwanted lines, including \cf0 and \cell\row at the beginning and…
jxn
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Understanding code from K&R

I'm reading K&R for my c language course, I have question in function readlines from section 5.6: /*readlines: read input lines*/ int readlines(char *lineptr[], int maxlines) { int len, nlines; char *p, line[MAXLEN]; nlines=0; …
Assaf
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what file size do we need replicate "Cannot read from a closed TextReader" error?

Had got this error in my program. Came across a few posts which kind of gave me the idea that this issue is probably due to file size. As far as my program is concerned, the observation I find is for small file sizes I do not get this error. For a…
deostroll
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python parsing input, making a sum of the input

I am attempting to parse a file with the following format 1999 I Willem Jan van Steen 9859 77 Guillaume Kielmann 5264 77 Guillaume Bos 8200 6 (the file is much longer, and is seperated by academic year (as…
user3016937
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R formule with readLines

I'm new in R and am trying to make a formula with the function readLines, but all the time R returned the same errors and do not know how to fix it. Any suggestions? my formula sam.cover<-function(){ readLines()->CH …
Maria
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R - readLines outputs empty lines

I have encountered some strange behaviour of the readLines()-function which is basically included for all R-runs. As I have done it houndreds or thousands of times before, I tried to read the lines of a file like this: workingDir <- "" tempFile <-…
Florian R. Klein
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