visitor
A tiny pythonic visitor implementation.
Decision gist · record as of 2026-08-14
No. The package is abandoned and unmaintained since 2016-05-18. The author's own documentation suggests copy-pasting the source instead of taking a dependency. High install friction combined with zero maintenance signal and no security updates makes this a poor choice—either inline the pattern or use a maintained alternative.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- High install friction with no runtime dependencies.
- Package is abandoned as of 2016-05-18 with no updates since its last commit on 2016-05-19.
- Supports both Python 2 and 3 but receives no maintenance.
License · maintenance · safety
MIT (permissive) — MIT license permits unrestricted use, modification, and distribution with minimal restrictions, making it safe to adopt from a licensing standpoint.
last release 2016-05-18 (3740 days) · last repo commit 2016-05-19 · 12 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 444,237 downloads/mo, #6,623 on PyPI
Alternatives
Verify before relying
from visitor import Visitor
class MyVisitor(Visitor):
def visit_str(self, node):
return node.upper()
def visit_int(self, node):
return node * 2
visitor = MyVisitor()
print(visitor.visit("hello")) # dispatches to visit_str- Whether the package works reliably with modern Python versions despite no maintenance since 2016
- Whether high install friction is due to build requirements or packaging issues
- Real-world adoption rate and whether the 444237 monthly downloads reflect active use or legacy dependencies
What it is and what it does
visitor is a minimal library implementing the visitor design pattern for Python. It provides a base Visitor class that uses dynamic method dispatch to route calls to type-specific visit methods—for example, visit_str for strings, visit_int for integers. You subclass Visitor and define visit_* methods for each type you want to handle; calling visitor.visit(node) automatically dispatches to the appropriate handler based on the node's type.
The library is intentionally tiny and the author explicitly suggests copy-pasting the source into your project rather than adding a dependency. It has no runtime dependencies and supports both Python 2 and 3, but has been abandoned since 2016 with no maintenance or updates.
Use it for
- Implement custom JSON encoders or formatters that traverse nested data structures by type
- Build AST walkers or code analysis tools that need type-based dispatch on syntax nodes
- Create domain-specific language interpreters that process typed expression trees
- Write tree traversal algorithms where behavior depends on the node type encountered
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
No.
The package is abandoned and unmaintained since 2016-05-18. The author's own documentation suggests copy-pasting the source instead of taking a dependency. High install friction combined with zero maintenance signal and no security updates makes this a poor choice—either inline the pattern or use a maintained alternative.
Install
visitor on PyPI
Before you install
High install friction with no runtime dependencies. Package is abandoned as of 2016-05-18 with no updates since its last commit on 2016-05-19. Supports both Python 2 and 3 but receives no maintenance.
License in practice
MIT license permits unrestricted use, modification, and distribution with minimal restrictions, making it safe to adopt from a licensing standpoint.
Quickstart
from visitor import Visitor
class MyVisitor(Visitor):
def visit_str(self, node):
return node.upper()
def visit_int(self, node):
return node * 2
visitor = MyVisitor()
print(visitor.visit("hello")) # dispatches to visit_strVerify before relying
- Whether the package works reliably with modern Python versions despite no maintenance since 2016
- Whether high install friction is due to build requirements or packaging issues
- Real-world adoption rate and whether the 444237 monthly downloads reflect active use or legacy dependencies
Package facts
| License | MIT permissive |
| Python support | Not specified |
| Install friction | High. Source build required |
| Runtime dependencies | None |
| Maintenance | Abandoned 3,740 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 444,237 / month, #6,623 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Programming Language :: Python :: 2Programming Language :: Python :: 3 |
Evidence: visitor-0.1.3.tar.gz
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See also cobble · overloading · simplegeneric · multimethod · classes · json-stream · multipledispatch · plum-dispatch · ovld · sortedcollections