Get Excel-Style Column Names from Column Number in python

Get Excel-Style Column Names from Column Number in python

To convert a column number into an Excel-style column name (e.g., 1 becomes "A," 26 becomes "Z," 27 becomes "AA," and so on), you can use a simple function in Python. Here's one way to do it:

def excel_column_name(column_number): column_name = "" while column_number > 0: remainder = (column_number - 1) % 26 # Convert 1-based to 0-based column_name = chr(65 + remainder) + column_name # Convert to ASCII character column_number = (column_number - 1) // 26 # Update column_number return column_name # Example usage: print(excel_column_name(1)) # Output: "A" print(excel_column_name(26)) # Output: "Z" print(excel_column_name(27)) # Output: "AA" print(excel_column_name(702)) # Output: "ZZ" print(excel_column_name(703)) # Output: "AAA"

In this function:

  • We start with an empty column_name string.
  • We use a while loop to iteratively calculate the column name.
  • Inside the loop, we calculate the remainder when subtracting 1 from column_number and taking the modulo 26. This converts the 1-based Excel column number into a 0-based index for the letters of the alphabet ('A' corresponds to 0, 'B' to 1, and so on).
  • We convert this remainder to the corresponding ASCII character using chr(65 + remainder) (where 'A' is ASCII 65) and prepend it to the column_name string.
  • We update column_number by subtracting 1 and then performing integer division by 26 to determine the next part of the column name.
  • The loop continues until column_number becomes zero.

This function will correctly convert a column number into an Excel-style column name for a wide range of input values.

Examples

  1. Python code to convert column number to Excel-style column name:

    • "Python code to convert column number to Excel-style column name"
    • Description: This query seeks Python code to convert a column number into its corresponding Excel-style column name, such as 'A', 'B', 'C'... 'Z', 'AA', 'AB', etc.
    • Code:
      def get_excel_column_name(column_number): column_name = "" while column_number > 0: column_number, remainder = divmod(column_number - 1, 26) column_name = chr(65 + remainder) + column_name return column_name # Example usage: column_number = 28 print(get_excel_column_name(column_number))

  2. Python function to convert Excel-style column name to column number:

    • "Python function to convert Excel-style column name to column number"
    • Description: This query asks for a Python function to convert Excel-style column names like 'A', 'B', 'C'... 'Z', 'AA', 'AB', etc., to their corresponding column numbers.
    • Code:
      def get_column_number(column_name): column_number = 0 for char in column_name: column_number = column_number * 26 + (ord(char) - 64) return column_number # Example usage: column_name = "AA" print(get_column_number(column_name))

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