To more easily insert graphics into body cells, we can use the fmt_image() method. This allows for one or more images to be placed in the targeted cells. The cells need to contain some reference to an image file, either: (1) complete http/https or local paths to the files; (2) the file names, where a common path can be provided via path=; or (3) a fragment of the file name, where the file_pattern= argument helps to compose the entire file name and path= provides the path information. This should be expressly used on columns that contain only references to image files (i.e., no image references as part of a larger block of text). Multiple images can be included per cell by separating image references by commas. The sep= argument allows for a common separator to be applied between images.
Parameters
Name
Type
Description
Default
columns
SelectExpr
The columns to target. Can either be a single column name or a series of column names provided in a list.
None
rows
int | list[int] | None
In conjunction with columns=, we can specify which of their rows should undergo formatting. The default is all rows, resulting in all rows in targeted columns being formatted. Alternatively, we can supply a list of row indices.
None
height
str | int | None
The height of the rendered images.
None
width
str | int | None
The width of the rendered images.
None
sep
str
In the output of images within a body cell, sep= provides the separator between each image.
' '
path
str | Path | None
An optional path to local image files (this is combined with all filenames).
None
file_pattern
str
The pattern to use for mapping input values in the body cells to the names of the graphics files. The string supplied should use "{}" in the pattern to map filename fragments to input strings.
'{}'
encode
bool
The option to always use Base64 encoding for image paths that are determined to be local. By default, this is True.
True
Examples
Using a small portion of metro dataset, let’s create a new table. We will only include a few columns and rows from that table. The lines column has comma-separated listings of numbers corresponding to lines served at each station. We have a directory of SVG graphics for all of these lines in the package (the path for the image directory can be accessed via files("great_tables") / "data/metro_images", using the importlib_resources package). The filenames roughly corresponds to the data in the lines column. The fmt_image() method can be used with these inputs since the path= and file_pattern= arguments allow us to compose complete and valid file locations. What you get from this are sequences of images in the table cells, taken from the referenced graphics files on disk.
