# Worksheet Tables

Worksheet tables are references to groups of cells. This makes certain operations such as styling the cells in a table easier.

## Creating a table

    from openpyxl import Workbook
    from openpyxl.worksheet.table import Table, TableStyleInfo

    wb = Workbook()
    ws = wb.active

    data = [
        ['Apples', 10000, 5000, 8000, 6000],
        ['Pears',   2000, 3000, 4000, 5000],
        ['Bananas', 6000, 6000, 6500, 6000],
        ['Oranges',  500,  300,  200,  700],
    ]

    # add column headings. NB. these must be strings
    ws.append(["Fruit", "2011", "2012", "2013", "2014"])
    for row in data:
        ws.append(row)

    tab = Table(displayName="Table1", ref="A1:E5")

    # Add a default style with striped rows and banded columns
    style = TableStyleInfo(name="TableStyleMedium9", showFirstColumn=False,
                           showLastColumn=False, showRowStripes=True, showColumnStripes=True)
    tab.tableStyleInfo = style

    '''
    Table must be added using ws.add_table() method to avoid duplicate names.
    Using this method ensures table name is unque through out defined names and all other table name.
    '''
    ws.add_table(tab)
    wb.save("table.xlsx")

Table names must be unique within a workbook. By default tables are created with a header from the first row and filters for all the columns and table headers and column headings must always contain strings.

Warning

In write-only mode you must add column headings to tables manually and the values must always be the same as the values of the corresponding cells (ee below for an example of how to do this), otherwise Excel may consider the file invalid and remove the table.

Styles are managed using the the TableStyleInfo object. This allows you to stripe rows or columns and apply the different colour schemes.

## Working with Tables

`ws.tables` is a dictionary-like object of all the tables in a particular worksheet:

    >>> ws.tables
    {"Table1",  <openpyxl.worksheet.table.Table object>}

### Get Table by name or range

    >>> ws.tables["Table1"]
    or
    >>> ws.tables["A1:D10"]

### Iterate through all tables in a worksheet

    >>> for table in ws.tables.values():
    >>>    print(table)

### Get table name and range of all tables in a worksheet

Returns a list of table name and their ranges.

    >>> ws.tables.items()
    >>> [("Table1", "A1:D10")]

### Delete a table

    >>> del ws.tables["Table1"]

### The number of tables in a worksheet

    >>> len(ws.tables)
    >>> 1

## Manually adding column headings

In write-only mode you can either only add tables without headings:

    >>> table.headerRowCount = False

Or initialise the column headings manually:

    >>> headings = ["Fruit", "2011", "2012", "2013", "2014"] # all values must be strings
    >>> table._initialise_columns()
    >>> for column, value in zip(table.tableColumns, headings):
        column.name = value

### Filters

Filters will be added automatically to tables that contain header rows. It is not possible to create tables with header rows without filters.

## Table as a Print Area

Excel can produce documents with the print area set to the table name. Openpyxl cannot, however, resolve such dynamic defintions and will raise a warning when trying to do so.

If you need to handle this you can extract the range of the table and define the print area as the appropriate cell range.

    >>> from openpyxl import load_workbook
    >>> wb = load_workbook("QueryTable.xlsx")
    >>> ws = wb.active
    >>> table_range = ws.tables["InvoiceData"]
    >>> ws.print_area = table_range.ref        # Ref is the cell range the table currently covers