netlist_viewer 0.1.2

Visualize SPICE netlists as interactive circuit diagrams

netlist_viewer

Visualize SPICE netlists as interactive circuit diagrams.

netlist_viewer parses SPICE netlist files and renders them as schematic diagrams using automatic graph layout. Built with NetworkX for layout algorithms and PySide6 (Qt) for the GUI.

Installation

pip install netlist_viewer

Requires Python 3.13+.

Usage

Command Line

netlist_viewer path/to/circuit.spice

or, using uv:

uvx netlist_viewer path/to/circuit.spice

Options:

• -v, --verbose — Enable verbose logging

From Python

from netlist_viewer.spice_parser import SpiceParser
from netlist_viewer.layout import add_spring_locations
from netlist_viewer.gui.main import open_ui

netlist_text = """
V1 in 0 AC 1
R1 in mid 100
L1 mid out 10m
C1 out 0 1u
"""

parser = SpiceParser()
netlist = parser.parse(netlist_text)
placed = add_spring_locations(netlist)
open_ui(placed)

Controls

Input	Action
Left click	Select component
Right drag	Pan view
Scroll wheel	Zoom in/out
R	Rotate selected component 90 degrees
Ctrl+O	Open file

Supported SPICE Primitives

Prefix	Component	Terminals
R	Resistor	2
C	Capacitor	2
L	Inductor	2
D	Diode	2
Q	BJT	3 (C, B, E)
M	MOSFET	4 (D, G, S, B)
J	JFET	3 (D, G, S)
V	Voltage Source	2
I	Current Source	2
X	Subcircuit	Variable

Subcircuits (.SUBCKT / .ENDS) are supported and rendered as labeled boxes.

Development

# Install dev dependencies
uv sync

# Run tests
uv run pytest

# Run type checker
uv run ty check

# Run linter
uv run ruff check

# Run the viewer with a sample netlist
uv run main.py

License

MIT