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# read and write a csv file

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Impossible Impala answered on December 17, 2021 Popularity 10/10 Helpfulness 2/10

answer # read and write a csv file

related c# csv read write

related Writing into a CSV File

# read and write a csv file

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-1

# read Rows from CSV File
import csv
def read_csv_file(filename):
    with open(filename, encoding='utf-8', newline='') as file:
        return list(csv.reader(file))
      
# write Rows to CSV File
def write_to_csv_file(filename, rows):
    with open(filename, 'w', encoding='utf-8', newline='') as file:
        writer = csv.writer(file)
        writer.writerows(rows)

Popularity 10/10 Helpfulness 2/10 Language python

Source: Grepper

Tags: csv file python

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Contributed on Mar 30 2022

Impossible Impala

0 Answers Avg Quality 2/10

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c# csv read write

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using System;
using System.Collections.Generic;
using System.IO;
using System.Text;

namespace ReadWriteCsv
{
    /// <summary>
    /// Class to store one CSV row
    /// </summary>
    public class CsvRow : List<string>
    {
        public string LineText { get; set; }
    }

    /// <summary>
    /// Class to write data to a CSV file
    /// </summary>
    public class CsvFileWriter : StreamWriter
    {
        public CsvFileWriter(Stream stream)
            : base(stream)
        {
        }

        public CsvFileWriter(string filename)
            : base(filename)
        {
        }

        /// <summary>
        /// Writes a single row to a CSV file.
        /// </summary>
        /// <param name="row">The row to be written</param>
        public void WriteRow(CsvRow row)
        {
            StringBuilder builder = new StringBuilder();
            bool firstColumn = true;
            foreach (string value in row)
            {
                // Add separator if this isn't the first value
                if (!firstColumn)
                    builder.Append(',');
                // Implement special handling for values that contain comma or quote
                // Enclose in quotes and double up any double quotes
                if (value.IndexOfAny(new char[] { '"', ',' }) != -1)
                    builder.AppendFormat("\"{0}\"", value.Replace("\"", "\"\""));
                else
                    builder.Append(value);
                firstColumn = false;
            }
            row.LineText = builder.ToString();
            WriteLine(row.LineText);
        }
    }

    /// <summary>
    /// Class to read data from a CSV file
    /// </summary>
    public class CsvFileReader : StreamReader
    {
        public CsvFileReader(Stream stream)
            : base(stream)
        {
        }

        public CsvFileReader(string filename)
            : base(filename)
        {
        }

        /// <summary>
        /// Reads a row of data from a CSV file
        /// </summary>
        /// <param name="row"></param>
        /// <returns></returns>
        public bool ReadRow(CsvRow row)
        {
            row.LineText = ReadLine();
            if (String.IsNullOrEmpty(row.LineText))
                return false;

            int pos = 0;
            int rows = 0;

            while (pos < row.LineText.Length)
            {
                string value;

                // Special handling for quoted field
                if (row.LineText[pos] == '"')
                {
                    // Skip initial quote
                    pos++;

                    // Parse quoted value
                    int start = pos;
                    while (pos < row.LineText.Length)
                    {
                        // Test for quote character
                        if (row.LineText[pos] == '"')
                        {
                            // Found one
                            pos++;

                            // If two quotes together, keep one
                            // Otherwise, indicates end of value
                            if (pos >= row.LineText.Length || row.LineText[pos] != '"')
                            {
                                pos--;
                                break;
                            }
                        }
                        pos++;
                    }
                    value = row.LineText.Substring(start, pos - start);
                    value = value.Replace("\"\"", "\"");
                }
                else
                {
                    // Parse unquoted value
                    int start = pos;
                    while (pos < row.LineText.Length && row.LineText[pos] != ',')
                        pos++;
                    value = row.LineText.Substring(start, pos - start);
                }

                // Add field to list
                if (rows < row.Count)
                    row[rows] = value;
                else
                    row.Add(value);
                rows++;

                // Eat up to and including next comma
                while (pos < row.LineText.Length && row.LineText[pos] != ',')
                    pos++;
                if (pos < row.LineText.Length)
                    pos++;
            }
            // Delete any unused items
            while (row.Count > rows)
                row.RemoveAt(rows);

            // Return true if any columns read
            return (row.Count > 0);
        }
    }
}

Popularity 10/10 Helpfulness 4/10 Language csharp

Source: www.codeproject.com

Tags: c# c

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Contributed on Dec 17 2021

master4x

0 Answers Avg Quality 2/10

Writing into a CSV File

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import com.opencsv.CSVWriter;
import java.io.FileWriter;
import java.net.URL;

public class WritingCSVFileExample {

  public static void main(String[] args) throws Exception {
    URL fileUrl = WritingCSVFileExample.class.getClassLoader().getResource("data.csv");

    CSVWriter writer = new CSVWriter(new FileWriter(fileUrl.getFile()));

    //Create record
    String[] record = "2,Rahul,Vaidya,India,35".split(",");

    //Write the record to file
    writer.writeNext(record, false);

    //close the writer
    writer.close();
  }
}

Popularity 9/10 Helpfulness 1/10 Language java

Source: howtodoinjava.com

Tags: csv

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Contributed on Dec 30 2022

Deepika Sahu

0 Answers Avg Quality 2/10

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