Panda's Write CSV Append vs Write python,csv,pandas I would like to use pdwrite_csv to write "filename" (with headers) if "filename" doesn't exist, otherwise to append to "filename" if it exists If I simply use command dfto_csv('filenamecsv',mode = 'a',header ='column_names') The write or append succeeds, but it seems like the header is 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, bettertohandle file and calculating the average of some values Basically the same code in groovy runs about 30 times faster And I can't believe that Ruby is that slow!# Write a single hash to a CSV file # @param table Hash The hash to write # @param file String The path to the CSV file to write to def self writeHash (table, file) CSV writeHashArray (table, file) end # Write an array of hashes to a CSV file # @param table Array The array of hashes to write Must have consistent columns # @param file String The path to the CSV file
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Ruby csv write hash- SmarterCSV smarter_csv is a Ruby Gem for smarter importing of CSV Files as Array(s) of Hashes, suitable for direct processing with Mongoid or ActiveRecord, and parallel processing with Resque or Sidekiq One smarter_csv user wrote Best gem for CSV for us yet taking an import process from 7 hours to about 3 minutes Smarter CSV was a big part andIf you want to write to a file you'll have to use something like Filewrite("catscsv", data), or instead of generate you can use open with a file name & write mode enabled Like this CSVopen("catscsv", "w") do csv csv white, 2 end Now you have a new CSV file!
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The CSV file may have more than one row (after the header row) I will therefore construct an array of hashes, one hash for each row after the header row;Def import_csv (file) CSVforeach(filepath, headers true, header_converterssymbol, skip_blanks true, convertersall) do row # hash the input row row_hash = rowto_hash # create a new row with the hash in original_record fl = selfforecast_linescreate(original_record row_hashto_s) # write the hash to the record attributes flattributes = row_hash flsave end end Ruby Basic Exercise31 with Solution Write a Ruby program to retrieve the total marks where subject name and marks of a student stored in a hash Sample subject and marks Literature 74, Science – , Math91
Actually, this looks like an array of CSVRows It has a #to_hash We can use mapto apply that to each element in the array csvto_amap {row rowto_hash }# => {"Year"=>"1997", "Make"=>"Ford", "Model"=>"50", "Description"=>"ac, abs, moon", "Price"=>""}, {"Year"=>"1999", "Make"=>"Chevy", "Model"=>"Venture \"Extended Edition\"",Being able to work with CSV can be pretty handy just write a little Ruby script, and filter that data, or work with it otherwise The first line in the code below require "csv" makes Ruby's CSV library available to your program so that you can then use the class CSV Exercise 151This is intended as the primary interface for writing a CSV file You must pass a filename and may optionally add a mode for Ruby's open() You may also pass an optional Hash containing any options CSVnew() understands as the final argument
Ruby Hashes A Hash is a collection of keyvalue pairs like this "employee" = > "salary" It is similar to an Array, except that indexing is done via arbitrary keys of any object type, not an integer index The order in which you traverse a hash by either key or value may seem arbitrary and will generally not be in the insertion order/packs/js/applicationd4b2fdfbfdbf7efjs file not fount in Rails 6 applications 1510 Florent L imported from StackoverflowCSV to hashes Ruby Tutorial With Ruby, you can read and write to config files and logs, automate tasks like mail merge, and find and organize files without ever leaving your code editor
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Headers ruby csv write hash How to write columns header to a csv file with Ruby?This is what a CSV file looks like id,name 1,chocolate 2,bacon 3,apple 4,banana 5,almonds Now you're going to learn how to use the Ruby CSV library to read & write CSV files Ruby CSV Parsing Ruby comes with a builtin CSV library You can read a file directly require 'csv' CSVread("favorite_foodscsv") Or you can parse a string with CSVRuby hash array to CSV Raw hash_array_to_csvrb class Array def to_csv(csv_filename="hashcsv") require 'csv' CSVopen(csv_filename, "wb") do csv csv
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CSV Gems & Performance The builtin library is fine & it will get the job done# File csv/writerrb, line 32 defIf you want column headers and you have multiple hashes require 'csv' hashes = {'a' => 'aaaa', 'b' => 'bbbb'} column_names = hashesfirstkeys s=CSVgenerate do csv csv
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Pry, Ruby, Array#zip, CSV, and the Hash Constructor Sep 15 th, 14 606 pm A couple weeks ago, I wrote a popular article, Pry, Ruby, and Fun With the Hash Constructor demonstrating the usefulness of pry with the Hash bracket constructor That taught me that creating a legit CSV string is not as easy as it soundsRuby CSV This method works like Ruby's open() call, in that it will pass a CSV object to a provided block and close it when the block terminates, or it will return the CSV object when no block is provided (Note This is different from the Ruby 18 CSV library which passed rows to You may have a CSV file generated from a report generated, and then you may need to write a Ruby method or task to insert it into the database Before we start, we need to make sure that the first line in the CSV file (the header line) has the same name as the column names of our respective model
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Write events to disk in CSV or other delimited format Based on the file output, many config values are shared Uses the Ruby csv library internally Csv Output Configuration Options edit This plugin supports the following configuration options plus the Common Options described laterHow to write a hash in ruby Today's episode we cover the basics of hashes in Ruby Making a hash is simple and there are several ways to do it ★☆★ THE BEST The usual workflow for working with CSV files in Ruby is (assuming they're on your hard drive) Load the rows into the program's memory with
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FasterCSV was # intended as a replacement to Ruby's then standard CSV library It was # designed to address concerns users of that library had and it had three # primary goals # # 1 Be significantly faster than CSV while remaining a pure Ruby library # 2The most generic interface of the library is csv = CSVnew (string_or_io, **options) # Reading IO object should be open for read csvread # => array of rows # or csveach do row # end # or row = csvshift # Writing IO object should be open for write csv(2) I am having trouble writing columns to a csv file with Ruby Below is my snippet of code calc = numerator/denominatorto_f data_out = "#{numerator}, #{denominator}, #{calc
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Extract the elements (instances of CSV Row class) one by one with the map method, and hash the elements with the to_h method Since the return value of the map method is an array, an array with the hash as an element is created The point is that the key name of the hash is the CSV column name by adding the header => true option this timeWith ruby hash to csv How do I create a new CSV file Now you know how to copy and to write to a file, to read a CSV and therefore grab the data for manipulation you just do CSVforeach("filecsv") do row puts row #first row would be "animal", "count", "price" etc endRuby on rails, how to remove whitespace from japanese word?
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Working With CSV Files in Ruby 4 Minute Read comma, separated, values CSV stands for "comma separated values" and csv files contain rows of text Each row has strings separated by commas Each row, and the comma separated strings within each row, can be thought of as a single record in a databaseHash then args pop else Hash new end # wrap a File opened with the remaining args with no newline # decorator file_opts = {universal_newline false} merge (options) begin f = File open (* args, file_opts) rescue ArgumentError = > e raise unless /needs binmode/ =~ e message and args size == 1 argsRuby Gem for smarter importing of CSV Files as Array(s) of Hashes, with optional features for processing large files in parallel, embedded comments, unusual field and recordseparators, flexible mapping of CSVheaders to Hashkeys
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File containing data separated by tabs What is a CSV file?As we first converted the CSV file into an Array of CSVRow's we need to iterate through and convert each line to a hash, saving it in a new hashed_data variable thatA comma, not a comma followed by a space, is the field separator in the CSV file
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CSV This class provides a complete interface to CSV files and data It offers tools to enable you to read and write to and from Strings or IO objects, as needed The most generic interface of the library is csv = CSVnew(string_or_io, **options) # Reading IO object should be open for read csvread # => array of rows # or csveach do rowCreating a Hash In Ruby you can create a Hash by assigning a key to a value with =>, separate these key/value pairs with commas, and enclose the whole thing with curly braces This is how it looks { "one" => "eins", "two" => "zwei", "three" => "drei" } I've previous written about exporting your data from rails into an Excel file Note that in the case where our user uploads a CSV file, By passing this array to Ruby's Hash method,
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Reading and writing to a csv file rubyprocessing # # Loading Tabular Data # after Daniel Shiffman, by Martin Prout # # This example demonstrates how to use CSV # to retrieve data from a CSV file and make objects # from that data # # Here is what the CSV looks like # # x,y,diameter,name # 160,103,,Happy # 372,137,,SadRuby Gem for smarter importing of CSV Files as Array(s) of Hashes, with optional features for processing large files in parallel, embedded comments, unusual fieldRuby CSV from hash with values for each key stored vertically Need pointers on writing a hash to a csv with keys forming the column names and the key values being the column values Hash is of the format as below hash = { 'A' => 'v', 'x', 'y' , 'z s ruby csv hash
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In this article, I have summarized the basic knowledge of handling TSV files and CSV files in Ruby like my memo Before TSV and CSV, I would like to check the File class together What is a TSV file? Read A Guide to the Ruby CSV Library, Part II and learn with SitePoint Our web development and design tutorials, courses, and books will teach you HTML, CSS, JavaScript, PHP, Python, and more
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