grantt 0.2.0

Making Gantt charts in matplotlib

Granttpy

When you want to make a Gantt chart look nice for a grant or whatever

Installation

You can install directly from this repository via

pip install grantt

As a side-note, we recommend installing with uv using

uv pip install grantt

Example

After grantt is installed, copy the script from here into ex.py and run python ex.py (or python3 depending on your installation).

Basic instructions

Making a Gantt chart is as easy as making different grantt.Elements, the parent class for all the different things on the chart. Type help(grantt.Element) to see the fields for the constructor: most of them should be self-explanatory, but here are a few notes on the more cryptic fields.

• zorder_delta: how much precedent the element should have when displaying on top of (or behind) other objects
• level_increment: The chart is generated by starting from the top and moving down. Every time that an element with a nonzero increment is added, the following elements are below it vertically. If you have two elements overlapping vertically, try increasing the level_increment of one.
• textalignment: takes left, right, or center.
• Any colors (i.e., color or textcolor) take in any argument that MPL would (e.g., k for black or #FF0000 for red, etc).

grantt.Span

A grantt.Span just spans an amount of time, generally acting as a divider between two vertically adjacent sections. It has a start and end date as well as an adjustable edge height for the prongs on the sides.

grantt.Period

A grantt.Period also spans an amount of time, but acts more as a time period that one might work on a task. These are represented by thicker lines; therefore, you may be interested in changing lw, the linewidth of the element.

grantt.Event

A grantt.Event is a point in time that something happens with no duration---think milestone or deadline. Along with choosing the date of the deadline, you can customize the marker and its markersize (which will need to be done based on the aspect ratio and scaling of the figure).

Defaults

There are several defaults that you can customize using Gantt.set_X, where X is the option.

• marker: default marker for grantt.Event elements
• markersize: default markersize for grantt.Event elements
• linewidth: default linewidth for grantt.Period elements
• textcolor: default textcolor for all elements
• span_edge_height: default height of the edge brackets for grantt.Span elements
• luminance_threshold: the threshold for automatically switching between white and black text in grantt.Period elements based on their color.