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Description:

dataflowdiagram 1.10.1

DFD
DFD (Data Flow Diagram) Generator - Commandline tool to generate
diagrams as images in various formats (SVG, PNG, JPG, PDF, etc.) from
source text files.
The source for this project is available here.
The package page is available here.
Scope
The present tool allows to create diagrams following the "Structured
Analysis / Stuctured Design" (SA/SD) modelling technique as described
by Edward Yourdon.
SA/RT (which is SA/SD with a real-time extension), can be found in the
design of real-time and embedded systems.
Example: Firmware modelling of the Active Descent
System of the Rosetta
Lander
spacecraft.
Surprisingly, SA/RT is also well-suited to the analyse and design of
web micro-services and IoT architectures.
Summary
Data Flow Diagram are used to model the flow and processing of
information through a system.
process P Process
process P2 Process
entity E Entity
store S Store
channel C Channel

E --> P flow
P ::> P2 signal
P <-> S bidirectional flow
P --- C undirected flow

Syntax and examples
See the documentation page.
Dependencies

Python3
Graphviz

Installing via pip3
[sudo] pip3 install data-flow-diagram

Installation troubleshooting
If you get an error at runtime like:
ModuleNotFoundError: No module named 'reportlab.graphics._renderPM'

you may have to reinstall reportlab:
[sudo] python3 -m pip install --upgrade --force-reinstall reportlab

Usage
data-flow-diagram -h says:
usage: data-flow-diagram [-h] [--output-file OUTPUT_FILE] [--markdown]
[--format FORMAT] [--percent-zoom PERCENT_ZOOM]
[--background-color BACKGROUND_COLOR] [--debug]
[INPUT_FILE]

Command-line DFD diagram generator. Converts a textual description into a
graphic file.

positional arguments:
INPUT_FILE UML sequence input file; if omitted, stdin is used

options:
-h, --help show this help message and exit
--output-file OUTPUT_FILE, -o OUTPUT_FILE
output file name; pass '-' to use stdout; if
omitted, use INPUT_FILE base name with '.svg'
extension, or stdout
--markdown, -m consider snippets between opening marker:
```data-flow-diagram OUTFILE, and closing marker:
``` allowing to generate all diagrams contained in
an INPUT_FILE that is a markdown file
--format FORMAT, -f FORMAT
output format: gif, jpg, tiff, bmp, pnm, eps, pdf,
svg (any supported by Graphviz); default is svg
--no-graph-title suppress graph title
--no-check-dependencies
suppress dependencies checking
--debug emits debug messages

See https://github.com/pbauermeister/dfd for information, syntax and
examples.