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pytcl
Pure Python TCL interpreter and parser library.
Installation
pip install pytcl
Usage
Interpreter
from pytcl.interpreter import Interpreter
i = Interpreter()
i.substitute_string("set x 42") # "42"
i.substitute_string("expr {$x * 2}") # "84"
i.substitute_string("set x") # "84"
Evaluate a .tcl file:
from pathlib import Path
from pytcl.interpreter import Interpreter
i = Interpreter()
i.substitute_file(Path("script.tcl"))
Custom commands
Commands are plain callables stored in the namespace:
from pytcl.interpreter import Interpreter
i = Interpreter()
i.namespace["double"] = lambda args, ns: str(int(args[0]) * 2)
i.substitute_string("double 21") # "42"
Parser
Parse Tcl source into a typed tree without executing it:
from pytcl.words import TCLScript
script = TCLScript.read(iter("set x [expr {1 + 2}]"))
for command in script.commands:
print(command.name, command.args)
Built-in commands
set, unset, expr, if / elseif / else, while, foreach, proc, return, break, continue, incr, append, puts, error
Development
uv sync --all-extras # install dependencies
uv run pytest # unit tests
uv run pytest integrations/ # integration tests (requires Docker)
uv run ruff check . # lint
uv run pre-commit run --all-files
1 maintainer
Metadata
1 maintainer
Release files for pytclsh 0.0.2
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Source distribution (sdist)
| File | Size | Uploaded | Provenance | |
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| pytclsh-0.0.2.tar.gz | 7.8 kB | With provenance | Details |
Built distribution (wheel)
| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| pytclsh-0.0.2-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 18.6 kB
Release files / pytclsh-0.0.2.tar.gz
| Download URL | pytclsh-0.0.2.tar.gz |
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| Size | 7.8 kB |
| Tags | Source |
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SHA-256 checksum How to use checksums |
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| Download URL | pytclsh-0.0.2-py3-none-any.whl |
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| Size | 10.8 kB |
| Tags | Python 3 |
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SHA-256 checksum How to use checksums |
350a4c4d15991a86126eab40494eb5d013acf1283da4fad9ec8887ac775175c2
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twine/6.1.0 CPython/3.13.7
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Signed by GitHub Actions, verified by PyPI on Apr 3, 2026.
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