Tables

Table 类提供了多种向终端呈现表格数据的方法。

要渲染一个表格，构建一个 Table 对象，用 add_column() 添加列，用 add_row() 添加行，最后将其打印到控制台。

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from rich.console import Console
from rich.table import Table

table = Table(title="Star Wars Movies")

table.add_column("Released", justify="right", style="cyan", no_wrap=True)
table.add_column("Title", style="magenta")
table.add_column("Box Office", justify="right", style="green")

table.add_row("Dec 20, 2019", "Star Wars: The Rise of Skywalker", "$952,110,690")
table.add_row("May 25, 2018", "Solo: A Star Wars Story", "$393,151,347")
table.add_row("Dec 15, 2017", "Star Wars Ep. V111: The Last Jedi", "$1,332,539,889")
table.add_row("Dec 16, 2016", "Rogue One: A Star Wars Story", "$1,332,439,889")

console = Console()
console.print(table)

Rich will calculate the optimal column sizes to fit your content, and will wrap text to fit if the terminal is not wide enough to fit the contents.

You are not limited to adding text in the add_row method. You can add anything that Rich knows how to render (including another table).

Table Options

There are a number of keyword arguments on the Table constructor you can use to define how a table should look.

• title Sets the title of the table (text show above the table).
• caption Sets the table caption (text show below the table).
• width Sets the desired width of the table (disables automatic width calculation).
• min_width Sets a minimum width for the table.
• box Sets one of the Box styles for the table grid, or None for no grid.
• safe_box Set to True to force the table to generate ASCII characters rather than unicode.
• padding A integer, or tuple of 1, 2, or 4 values to set the padding on cells.
• collapse_padding If True the padding of neighboring cells will be merged.
• pad_edge Set to False to remove padding around the edge of the table.
• expand Set to True to expand the table to the full available size.
• show_header Set to True to show a header, False to disable it.
• show_footer Set to True to show a footer, False to disable it.
• show_edge Set to False to disable the edge line around the table.
• show_lines Set to True to show lines between rows as well as header / footer.
• leading Additional space between rows.
• style A Style to apply to the entire table, e.g. “on blue”
• row_styles Set to a list of styles to style alternating rows. e.g. ["dim", ""] to create zebra stripes
• header_style Set the default style for the header.
• footer_style Set the default style for the footer.
• border_style Set a style for border characters.
• title_style Set a style for the title.
• caption_style Set a style for the caption.
• title_justify Set the title justify method (“left”, “right”, “center”, or “full”)
• caption_justify Set the caption justify method (“left”, “right”, “center”, or “full”)
• highlight Set to True to enable automatic highlighting of cell contents.

Border Styles

你可以通过导入一个预设的 Box 对象并在 table 构造函数中设置 box 参数来设置边界样式。

Here’s an example that modifies the look of the Star Wars table:

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from rich import box
table = Table(title="Star Wars Movies", box=box.MINIMAL_DOUBLE_HEAD)

See Box for other box styles.

设置 box=None 来删除边框

Table 类提供了许多配置选项来设置表的外观和感觉，包括边框的呈现方式以及列的样式和对齐方式。

Lines

默认情况下，table 只会在标题下显示一行。如果你想在所有行之间显示行，请在构造函数中添加 show_lines=True

你也可以通过在调用 add_row() 时设置 end_section=True 来强制在下一行显示一行，或者通过调用 add_section() 来在当前行和后续行之间添加一行。

Empty Tables

打印一个没有列的表的结果是一个空白行。

如果你正在动态地建立一个表，并且数据源没有列，你可能想打印一些不同的东西，可以这样写：

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if table.columns:
    print(table)
else:
    print("[i]No data...[/i]")

Adding Columns

你也可以通过在表构造函数的位置参数中添加指定列。

For example, we could construct a table with three columns like this:

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table = Table("Released", "Title", "Box Office", title="Star Wars Movies")

这允许你只指定该列的文本。如果你想设置其他属性，如宽度和样式，你可以添加一个 Column 类

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from rich.table import Column
table = Table(
    "Released",
    "Title",
    Column(header="Box Office", justify="right"),
    title="Star Wars Movies"
)

Column Options

There are a number of options you can set on a column to modify how it will look.

• header_style Sets the style of the header, e.g. “bold magenta”.
• footer_style Sets the style of the footer.
• style Sets a style that applies to the column. You could use this to highlight a column by setting the background with “on green” for example.
• justify Sets the text justify to one of “left”, “center”, “right”, or “full”.
• vertical Sets the vertical alignment of the cells in a column, to one of “top”, “middle”, or “bottom”.
• width Explicitly set the width of a row to a given number of characters (disables automatic calculation).
• min_width When set to an integer will prevent the column from shrinking below this amount.
• max_width When set to an integer will prevent the column from growing beyond this amount.
• ratio Defines a ratio to set the column width. For instance, if there are 3 columns with a total of 6 ratio, and ratio=2 then the column will be a third of the available size.
• no_wrap Set to True to prevent this column from wrapping.

Vertical Alignment

你可以通过设置列的 vertical 参数来定义该列的垂直对齐。你也可以通过用 Align 类来包装你的文本或可渲染的内容，在每一个单元格中实现这一功能

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table.add_row(Align("Title", vertical="middle"))

Grids

Table 类也可以成为一个很棒的布局工具。如果你禁用了页眉（header）和边框，你可以用它来定位终端内的内容。

替代的构造函数 grid() 可以为你创建这样一个表格。

例如，下面的代码显示了两段文字，它们在终端的左边和右边的边缘上都对齐了一行。

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from rich import print
from rich.table import Table

grid = Table.grid(expand=True)
grid.add_column()
grid.add_column(justify="right")
grid.add_row("Raising shields", "[bold magenta]COMPLETED [green]:heavy_check_mark:")

print(grid)