How to Read Excel Files in Python with IronXL

// Ensure to include the necessary namespace for working with spreadsheets
using System;

// Hypothetical library for handling Excel spreadsheets
// Note: You need to reference the actual library in your project
using SomeSpreadsheetLibrary;

// Load an existing spreadsheet file using a hypothetical workbook class
// Create an instance of a workbook from an existing file
WorkBook workbook = null;
try
{
    workbook = WorkBook.Load("Spreadsheets\\GDP.xlsx");
}
catch (Exception ex)
{
    Console.WriteLine($"An error occurred while loading the spreadsheet: {ex.Message}");
}

// Check if the workbook was loaded successfully
if (workbook == null)
{
    Console.WriteLine("Failed to load the spreadsheet.");
}
else
{
    Console.WriteLine("Spreadsheet loaded successfully.");
}

// The code above attempts to load a spreadsheet file named "GDP.xlsx"
// from the "Spreadsheets" directory using a fictional library. It wraps
// the loading process in a try-catch block to handle any exceptions that
// might occur during loading. If the workbook is successfully loaded, it 
// outputs "Spreadsheet loaded successfully." If loading fails, it catches 
// the exception and outputs an error message.

// Assuming `workBook` is an already existing and initialized instance of a workbook.
// It is expected to be part of a library that handles Excel files, such as Epplus, NPOI, etc.

// Fetch the worksheet named "GDPByCountry" from the workbook.
var workSheet = workBook.Worksheets["GDPByCountry"];

// Note:
// 1. This line of code specifically pertains to a situation where you've already loaded or created a workbook
//    and need to access a specific worksheet by name.
// 2. It's essential for the library being used to support such operations. In libraries like Epplus and NPOI, 
//    the usage may slightly differ, so please ensure that the right method is being called specific to that library's API.

// Example when using the EPPlus library:
using OfficeOpenXml;
ExcelPackage package = new ExcelPackage(new FileInfo("yourfile.xlsx"));
ExcelWorksheet workSheetEpplus = package.Workbook.Worksheets["GDPByCountry"];

// Example when using the NPOI library:
using NPOI.XSSF.UserModel;
XSSFWorkbook workbookNpoi = new XSSFWorkbook(new FileStream("yourfile.xlsx", FileMode.Open, FileAccess.Read));
XSSFSheet workSheetNpoi = (XSSFSheet)workbookNpoi.GetSheet("GDPByCountry");

// Ensure proper error handling for cases where the worksheet might not exist
if (workSheet == null)
{
    Console.WriteLine("Worksheet 'GDPByCountry' does not exist in the workbook.");
    // Handle the absence of the worksheet as needed, possibly by terminating the operation
    // or attempting to create a new worksheet.
}

// Include necessary namespaces
using IronXL; // Make sure to have the IronXL library installed and properly referenced

// Create a new WorkBook object with the specified Excel file format.
// IronXL's ExcelFileFormat enum supports multiple formats such as XLSX, XLS, and CSV.
WorkBook workBook = WorkBook.Create(ExcelFileFormat.XLSX);

// Note: Ensure the IronXL library is added to your project. 
// You can include it via the NuGet Package Manager or by directly downloading the library.
// This enables you to work with Excel files efficiently within your C# application.

// Assuming that we are using a library for handling Workbooks and Worksheets, such as EPPlus or another Excel library.
// Ensure you have added the appropriate using directives for the library being used. This example assumes EPPlus.
using System.IO; // Necessary for file handling.
using OfficeOpenXml; // Assumed library for handling Excel files.

// Code snippet to add a new worksheet to a workbook.
// Note: EPPlus may require a license. Ensure proper licensing compliance when using this library.

// Create a new Excel package.
// In a real scenario, this would be done by providing a file path to a FileInfo object.
using (ExcelPackage excelPackage = new ExcelPackage())
{
    // Add a new worksheet named "GDPByCountry" to the workbook.
    ExcelWorksheet workSheet = excelPackage.Workbook.Worksheets.Add("GDPByCountry");

    // The workSheet variable now holds a reference to the newly created worksheet,
    // where you can now perform various operations, such as adding data, formatting cells, etc.

    // Example: Adding a header to the worksheet in cells A1 and B1.
    workSheet.Cells["A1"].Value = "Country"; // Cell A1 will be labeled 'Country'.
    workSheet.Cells["B1"].Value = "GDP";     // Cell B1 will be labeled 'GDP'.

    // Further code can manipulate the workSheet object, save the excelPackage to a file, etc.

    // Save the excel package to a file.
    // You need to specify a valid path where the output file will be saved.
    FileInfo fileInfo = new FileInfo("path_to_save\\GDPByCountry.xlsx");
    excelPackage.SaveAs(fileInfo);
}

using IronXL;

class Program
{
    static void Main()
    {
        // Load an existing spreadsheet named "test.xlsx"
        // The WorkBook.Load method loads the spreadsheet into memory
        WorkBook workbook = WorkBook.Load("test.xlsx");
        
        // Access the default worksheet within the workbook
        // Use workbook.DefaultWorkSheet to retrieve it
        WorkSheet worksheet = workbook.DefaultWorkSheet;
        
        // Access cell B1 in the worksheet
        // This retrieves the cell object located at B1
        var cell = worksheet["B1"];
        
        // Output the value of the cell, if needed
        // Console.WriteLine(cell.Value);
    }
}

// The following code demonstrates how to access and manipulate Excel cells in a worksheet using a C# library like EPPlus or ClosedXML.
// The code accesses cell B1, reads its current value, and then writes a new numerical value to it.

// Assuming workSheet is an instance of ExcelWorksheet (EPPlus) or IXLWorksheet (ClosedXML),
// make sure to initialize this object before using it in the lines below.
var cell = workSheet.Cells["B1"]; // Access cell B1 in the worksheet

// Read the current value of cell B1, assuming it is stored as a string
string initialValue = cell.Text; // For EPPlus, .Text returns the formatted cell value as a string.
// Alternative for ClosedXML: string initialValue = cell.GetValue<string>();
Console.WriteLine($"Initial value in B1: {initialValue}");

// Write a new numerical value to the cell
cell.Value = 10.3289; // Assigns a double value to cell B1
// For ClosedXML, if explicitly needed: cell.SetValue(10.3289);

// Retrieve and display the new value from the cell as text
string newValue = cell.Text; // Retrieves the text representation of the new value.
// Alternative for ClosedXML: string newValue = cell.GetValue<string>();
Console.WriteLine($"New value in B1: {newValue}");

// This code snippet demonstrates how to access a range in an Excel worksheet using C#.
// The example uses the EPPlus library, but also mentions how it would differ if using ClosedXML.
// Ensure you have referenced the necessary library (EPPlus or ClosedXML) in your project.

// Assuming 'workSheet' is a valid reference to a worksheet object from the EPPlus library.
var range = workSheet.Cells["D2:D101"]; 
// This line accesses the range of cells from D2 to D101 in the worksheet.

// If you were to use the ClosedXML library instead, the syntax for accessing the range would be:

// var range = workSheet.Range("D2:D101");
// This line accesses the range of cells from D2 to D101 in the worksheet, similar to the EPPlus example.

// Note: The term 'workSheet' is assumed to be properly initialized and represents a worksheet 
// within an Excel workbook. The library-specific method to obtain 'workSheet' can vary between EPPlus
// and ClosedXML. Make sure to consult the documentation of the library you are using.

# This Python code iterates through rows in a spreadsheet starting from the 2nd row up to (but not including) a specified row `i`. 
# It sets a formula in each cell of column C to calculate the percentage of a total value. 
# The library used for spreadsheet manipulation should allow setting cell formulas. 
# Here is the corrected and formatted source code:

# Ensure that `i` and `workSheet` are initialized before this loop:
# `i`: This should be the row number containing the total value in column B.
# `workSheet`: This should be a valid worksheet object from the appropriate library, such as openpyxl.

for y in range(2, i):  # Start from row 2 up to (but not including) row `i`
    # Access the cell in column 'C' and row `y`
    cell = workSheet[f"C{y}"]

    # Set a formula in the cell to calculate the percentage of the total.
    # Formula: Divide value in column B at the current row `y` by the total in column B at row `i`.
    # Example formula when `y` is 2 and `i` is 10: cell.Formula = "=B2/B10"
    cell.Formula = f"=B{y}/B{i}"

# Notes:
# 1. Ensure that `workSheet` is a valid worksheet object from the appropriate library, like openpyxl for Excel.
# 2. The variable `i` should be correctly initialized with the row number that contains the total in column B.
# 3. This code assumes that `i` > 2 and that all necessary imports and initializations are done outside this snippet.
# 4. The code assumes that the target library supports setting a formula in this manner. Modify according to library specifics if necessary.