A comma-separated values (CSV) file stores tabular data (numbers and text) as plain text, with rows and columns delimited by line terminators and commas, respectively. You may also use this tag for variants where fields are separated by tabs or semicolons.

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4answers
46 views

Comparing phone numbers across CSVs Python

(continuation from Speeding up and fixing phone numbers from CSVs with Regex) I'm pulling all of the phone numbers from all CSVs in two different directories, outputting them in a single simple ...
2
votes
2answers
94 views

Speeding up and fixing phone numbers from CSVs with Regex

I've hodgepodged together an attempt to extract all phone numbers from all CSVs in a directory, regardless of where they are and what format they're in. I want all phone numbers to be printed to a ...
7
votes
2answers
186 views

Parsing CSV file with BufferedReader vs Scanner

I have to parse file line by line and in single line I have split by ",". First String would be Name and Second would be count. Finaly I have to display the Key and Count For example ...
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votes
0answers
46 views

Optimizing a function to read bigger files in php

I have the following function that reads data from a csv file and it is supposed to take in data which is from a certain certain timeinterval in this case 07:59 and saves them up in another csv file. ...
4
votes
1answer
115 views

Printing out JSON data from Twitter as a CSV?

I'm extremely new to Python, and the Twitter API, but I found a example online that walked me through the process. Now that I've been playing around with it for awhile, I've begun to push the limits ...
3
votes
1answer
69 views

Reading messages with binary tree

I'm building a binary tree. Example: key AAAA1.ETR, value 1. I'm reading files with this structure: ...
6
votes
2answers
95 views

Read CSV, compute some stuff and prepare data to be sent to GNUPlot

I would really appreciate some good advice on how to refactor a small app: It basically reads a CSV (energy/heat values?), computes some stuff, and then prepares some data which should later be sent ...
2
votes
2answers
85 views

Updating tables with bulk of data through CSV

My work is pretty simple. I have to migrate a bulk of data into the specified tables, so that the data does show up at the front-end. The data is provided through the ...
5
votes
1answer
89 views

Fastest Way to Write Multiple CSV's

I'm writing a program to process log files. Currently, I have a script that will extract the desired information from each log and put it into a list - I have about nine different lists all ...
4
votes
1answer
64 views

Cutting strings into smaller ones based on specific criteria

So, I've got this largish (for me) script, and I want to see if anybody could tell me if there are any ways to improve it, both in terms of speed, amount of code and the quality of the code. I still ...
3
votes
1answer
130 views

Knn console application; problematic implementation

I'm working on a small command line application in c# where data is read from a CSV file along with a query and KNN is calculated for the query based on the data. My problem isn't the algorithm at ...
3
votes
1answer
45 views

Generating two .csv files from named parameters

I wrote Clojure code which takes named params and has to generate 2 .csv files as output. Please review it. ...
6
votes
1answer
231 views

Speed up CSV reading code (vector of doubles)

I am trying to read a single-columned CSV of doubles into Java with a string header. It is 11 megabytes and takes over 15 minutes to read, which is clearly ...
6
votes
1answer
122 views

Calculate query coverage from BLAST output

I have a BLAST output file and want to calculate query coverage, appending the query lengths as an additional column to the output. Let's say I have 2 7 15 ...
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vote
1answer
74 views

Grouping a CSV by column

I've started writing a small CSV parser class as I needed a method to group a CSV file by a given column. ...
2
votes
0answers
915 views

Reading columns and rows in a .csv file

I have some data in a .csv file, which looks roughly like this: ...
3
votes
2answers
224 views

Reading in a file and performing string manipulation

In a question I answered I posted the following code: ...
6
votes
1answer
158 views

Creating a pythonic snippet to read and clean .csv files

I am trying to import a .csv file, clean the contents, and make sure all the errors are eliminated. IO error file format error data error I am using the snippet below. Could someone help me clean ...
3
votes
1answer
114 views

How to make this csv-reading PHP code more efficient?

I have the following code that reads a .csv file that than outputs the result in the form of a HTML table: ...
4
votes
2answers
220 views

Perl Code Improvements - reading CSV file

I am very new to Perl, but quite pleased with my short introduction to it! So, scenario is I have a number of text files (they are reports from a financial system) stored in a directory. Each report ...
1
vote
1answer
207 views

get city and state using zip code, scrape in Python

I'm looking for any and all feedback on quality, style and efficacy of the code. If there's a simple way to get the header put in, I'd love to hear that. The code is used to take zip codes from a csv ...
5
votes
1answer
117 views

Improve my copying of a CSV file

I need to merge some large csv files but I feel that the way I am doing it is not optmized. It gets a number of csvfiles and creates one ...
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vote
3answers
73 views

CSV file cleanup

I'm fairly new to Python and am going to be parsing hundreds of thousands of names eventually. What I wanted to do was take individual CSV files, and create new CSV files with only the info I wanted. ...
3
votes
1answer
89 views

Using a .csv file to insert data into the Django model

I have a script that uses a .csv file into insert data to the Django model. Now, I wonder if there's a better way of doing this. ...
16
votes
4answers
1k views

Regex to parse semicolon-delimited fields is too slow

I have a file with just 3500 lines like these: filecontent= "13P397;Fotostuff;t;IBM;IBM lalala 123|IBM lalala 1234;28.000 things;;IBMlalala123|IBMlalala1234" ...
4
votes
1answer
287 views

Converting latitude and longitude coordinates from CSV using web service

I am working on converting a mailing list that has longitude and latitude coordinates within the CSV file. This script I came up with does what I need, but this is my first real-world use of python. I ...
2
votes
1answer
172 views

Code correctness and refinement for quantile normalization

The below code is still far from feature complete, but am looking to have some of the sections critiqued to learn better idioms or adjustments (e.g. - yet to be implemented: handling of csv files with ...
0
votes
1answer
792 views
2
votes
2answers
404 views

Python: Open Multiple Files

I am trying to open two CSV files, one for reading and one for writing. The script should continue only if both files were successfully opened. My code seems to accomplish that but it seems like it ...
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vote
2answers
536 views

Writing defaultdict to CSV file

I have a defaultdict being written to file like this: ...
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4answers
130 views

How can I shorten and remove repetition from this Python script?

I've got a CSV that contains users and permissions in the below format, where users can have as little as one or as many as eight different permissions: ...
6
votes
1answer
328 views

Intern with no mentor struggling with refactoring and OOP

A little background I'm an intern at a large engineering company, and I'm also the only CS major in the entire building. The people on my team don't have technical backgrounds, but hired me to start ...
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votes
2answers
142 views

Python : Loop in a csv file with IF cases

I am new to Python and can't quite make my if-cases any shorter. Any ideas how to do that? ...
1
vote
1answer
192 views

Ruby CSV reading performance problems

I (ruby beginner) have a performance issue with the following ruby code. The idea is to aggregate a CSV into a smaller, better-to-handle file and calculating the average of some values. Basically the ...
3
votes
1answer
155 views

Is there a better or more elegant way to code this CSV cell-parser (using CSVReader)?

I'm currently doing my first internship and had to create an application that will check through the first row of a CSV for valid or invalid input. Is there a more elegant way to code or to refactor ...
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vote
2answers
333 views

Custom template iterator on CSV reading class

I made myself this code to read CSV files as I want to delve into machine learning. I do think that my code design is poor but I can't quite see why. The syntax of it does not feel right. I want to be ...
2
votes
3answers
450 views

Design Strategy of CSV Parser

I wanted to review my design strategy for CSV parser. I have 4 CSV files, which have different layouts as shown below. Each row of a CSV file will be mapped to a class. For example, if ...
2
votes
2answers
410 views

refactoring golang code

There are not many available resources for refactoring go code. I'm a novice gopher who would appreciate any feedback on a small program which reads a csv file, string converts and parses a few rows ...
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votes
2answers
440 views

Critiques on a trivially easy to use Python CSV class

I have been working on a project where I needed to analyze multiple, large datasets contained inside many CSV files at the same time. I am not a programmer but an engineer so I did a lot of searching ...
2
votes
0answers
180 views

Correctly import CSV data, even when possibly malformed

I've created a CSV parser that tries to build a string table out of a CSV file. The goal is to handle CSV files as well as Excel. Input CSV file: ...
2
votes
3answers
936 views

More efficient way to retrieve first occurrence of every unique value from a csv column?

A large .csv file I was given has a large table of flight data. A function I wrote to help parse it iterates over the column of Flight ID's, and then returns a ...
3
votes
1answer
115 views

Python: Improve csv script efficiency

I'm tasked with getting emails from a .csv file and using them to submit a form. I am using the csv and mechanize Python libraries to achieve this. This is my code: ...
5
votes
5answers
5k views

Faster way of reading csv to grid

I have following in Windows Forms .NET 3.5 It works fine for csv with records less than 10,000 but is slower for records above 30,000. Input csv file can can any records between 1 - 1,00,000 records ...
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vote
2answers
456 views

Updating a chart from Yahoo Finance CSV files

I want to load some CSV columns or contents in my Ajax code. Please help me or improve my code. This will be live API code for me. Data will be downloaded from Yahoo Finance in CSV format on an ...
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votes
8answers
18k views

Java function to read a CSV file

I have a java function that reads a csv and returns its content as a Vector<Vector<String>>. The function seems to work as I need it, but my gut ...
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votes
1answer
744 views

CSV parsing in Perl

I am looking for a Perl (5.8.8) script for CSV parsing that would follow CVS standards. (See Wikipedia or RFC-4180 for details) Sure, code should be fast enough, but more important is that it should ...
4
votes
4answers
2k views

searching a value from one csv file in another csv file - Python

I am writing a script that takes one csv file searches a value in another csv file then writes an output depending on the result it finds. I have been using python's csv. Distreader and writer, I ...
4
votes
4answers
718 views

File parsing code in C++

I'm processing about 3.5gb/15minutes, and I was wondering if I could get this down to a better time... Note that this is for a very specific CSV file, so I am not concerned about generality - only ...
1
vote
1answer
4k views

Fast import of numbers stored in a csv file in C++

I would like to efficiently import real numbers stored in csv format into an array. Is there a away to modify my code so it is faster? Also, is there a way to scan the file and compute the number of ...
3
votes
3answers
695 views

73 Lines of Mayhem - Parse, Sort and Save to CSV in PHP CLI

Inside of a folder named txt I have 138 text files (totaling 349MB) full of email addresses. I have no idea (yet) how many addresses there are. They are separated ...