⚡️ Speed up function _is_versioned by 143%

[codeflash-ai]

📄 143% (1.43x) speedup for _is_versioned in marimo/_cli/sandbox.py

⏱️ Runtime : 2.25 milliseconds → 926 microseconds (best of 157 runs)

📝 Explanation and details

The optimization replaces a generator expression with any() with explicit substring checks using early returns, achieving a 142% speedup.

Key optimizations applied:

1. Eliminated generator overhead: The original code creates a generator that checks each operator against the dependency string using any(c in dependency for c in (...)). The optimized version uses direct in operations with explicit conditional checks.

2. Strategic operator ordering: The optimized code checks the most common operators first (==, >=, <=) in one condition, then the less common ones (>, <, ~) in a second condition. This ordering allows for early returns when common version specifiers are found.

3. Reduced redundant string scanning: Instead of potentially scanning the string 6 times (once for each operator), the optimized version can return after finding the first match, reducing the average number of substring searches.

Why this leads to speedup:

• Generator elimination: Avoiding the overhead of generator creation and the any() function call
• Early termination: Most versioned dependencies use == or >=, so the function often returns after the first conditional check
• Optimized string operations: Direct in checks are faster than the iterator-based approach with any()

Performance characteristics from test results:

• Best case scenarios: Packages with == operators show the highest speedup (up to 175% faster) since they're checked first
• Consistent improvements: All test cases show meaningful speedup, with even large strings (1000+ characters) benefiting significantly
• Scalability: The optimization maintains its advantage across different input sizes, from single package names to batch processing of 1000+ dependencies

The optimization particularly benefits dependency parsing workflows where version checking is performed repeatedly on package specifications.

✅ Correctness verification report:

Test	Status
⚙️ Existing Unit Tests	🔘 None Found
🌀 Generated Regression Tests	✅ 5062 Passed
⏪ Replay Tests	🔘 None Found
🔎 Concolic Coverage Tests	✅ 1 Passed
📊 Tests Coverage	100.0%

🌀 Generated Regression Tests and Runtime

from future import annotations

imports

import pytest # used for our unit tests
from marimo._cli.sandbox import _is_versioned

unit tests

class TestIsVersioned:
# 1. Basic Test Cases

def test_exact_version(self):
    # Standard version specifier
    codeflash_output = _is_versioned("numpy==1.23.4") # 1.65μs -> 640ns (158% faster)

def test_greater_equal_version(self):
    # Greater than or equal to version
    codeflash_output = _is_versioned("pandas>=1.0.0") # 1.54μs -> 645ns (139% faster)

def test_less_equal_version(self):
    # Less than or equal to version
    codeflash_output = _is_versioned("scipy<=1.5.2") # 1.47μs -> 660ns (123% faster)

def test_greater_than_version(self):
    # Greater than version
    codeflash_output = _is_versioned("pytest>6.0.0") # 1.49μs -> 623ns (138% faster)

def test_less_than_version(self):
    # Less than version
    codeflash_output = _is_versioned("pytest<7.0.0") # 1.55μs -> 661ns (134% faster)

def test_tilde_version(self):
    # Tilde version specifier
    codeflash_output = _is_versioned("requests~2.20.0") # 1.61μs -> 768ns (109% faster)

def test_no_version(self):
    # No version specifier
    codeflash_output = _is_versioned("flask") # 1.32μs -> 643ns (105% faster)

def test_package_with_hyphen(self):
    # Package name contains hyphen, but no version
    codeflash_output = _is_versioned("scikit-learn") # 1.33μs -> 640ns (108% faster)

# 2. Edge Test Cases

def test_empty_string(self):
    # Empty string should not be versioned
    codeflash_output = _is_versioned("") # 1.22μs -> 507ns (141% faster)

def test_only_operator(self):
    # Only operator, no package name
    codeflash_output = _is_versioned(">=") # 1.42μs -> 606ns (134% faster)

def test_operator_at_start(self):
    # Operator at the start
    codeflash_output = _is_versioned("==1.0.0") # 1.25μs -> 453ns (175% faster)

def test_operator_at_end(self):
    # Operator at the end (malformed, but should detect)
    codeflash_output = _is_versioned("package>") # 1.50μs -> 650ns (131% faster)

def test_multiple_operators(self):
    # Multiple version specifiers in one string
    codeflash_output = _is_versioned("foo>=1.0.0,bar<2.0.0") # 1.28μs -> 569ns (125% faster)

def test_spaces_in_string(self):
    # Spaces around version specifier
    codeflash_output = _is_versioned("foo >= 1.0.0") # 1.32μs -> 582ns (126% faster)

def test_package_with_version_in_name(self):
    # Package name contains digits and dots but no operator
    codeflash_output = _is_versioned("lib2to3") # 1.35μs -> 670ns (101% faster)

def test_operator_in_package_name(self):
    # Package name contains a tilde but not as a version specifier
    codeflash_output = _is_versioned("foo~bar") # 1.53μs -> 603ns (153% faster)

def test_operator_in_middle_of_name(self):
    # Package name contains '>' in the name
    codeflash_output = _is_versioned("foo>bar") # 1.39μs -> 562ns (148% faster)

def test_operator_like_string(self):
    # String contains '=' but not as '=='
    codeflash_output = _is_versioned("foo=bar") # 1.26μs -> 561ns (125% faster)

def test_double_tilde(self):
    # Double tilde (not a valid version operator, but should be detected)
    codeflash_output = _is_versioned("foo~~1.0.0") # 1.53μs -> 705ns (117% faster)

def test_version_with_prerelease(self):
    # Version with a pre-release tag
    codeflash_output = _is_versioned("foo>=1.0.0rc1") # 1.30μs -> 556ns (133% faster)

def test_url_dependency(self):
    # URL dependency (should not be versioned)
    codeflash_output = _is_versioned("git+https://github.com/user/repo.git") # 1.45μs -> 754ns (92.4% faster)

def test_local_path_dependency(self):
    # Local path dependency (should not be versioned)
    codeflash_output = _is_versioned("./my_package") # 1.33μs -> 656ns (102% faster)

def test_operator_in_url(self):
    # URL containing a version operator as part of the URL
    codeflash_output = _is_versioned("git+https://github.com/user/repo.git@v1.0.0") # 1.39μs -> 689ns (101% faster)

def test_operator_in_extras(self):
    # Extras with version operator
    codeflash_output = _is_versioned("foo[extra]>=1.0.0") # 1.40μs -> 568ns (147% faster)

def test_operator_in_comment(self):
    # Comment after package, with operator in comment
    codeflash_output = _is_versioned("foo  # >=1.0.0") # 1.37μs -> 521ns (164% faster)

def test_unicode_characters(self):
    # Unicode in package name, no version
    codeflash_output = _is_versioned("fööbar") # 1.36μs -> 706ns (92.8% faster)

def test_operator_in_unicode(self):
    # Unicode with version operator
    codeflash_output = _is_versioned("fööbar>=1.0.0") # 1.37μs -> 533ns (157% faster)

def test_operator_escaped(self):
    # Escaped operator (should still be detected)
    codeflash_output = _is_versioned(r"foo\>=1.0.0") # 1.42μs -> 571ns (148% faster)

# 3. Large Scale Test Cases

def test_long_package_name(self):
    # Very long package name, no version
    long_name = "a" * 500
    codeflash_output = _is_versioned(long_name) # 1.84μs -> 1.19μs (55.3% faster)

def test_long_versioned_package(self):
    # Very long package name, with version
    long_name = "a" * 500 + ">=1.0.0"
    codeflash_output = _is_versioned(long_name) # 1.58μs -> 810ns (95.2% faster)

def test_many_dependencies_no_versions(self):
    # Simulate a requirements file with many packages, none versioned
    packages = [f"package{i}" for i in range(1000)]
    for pkg in packages:
        codeflash_output = _is_versioned(pkg) # 463μs -> 196μs (136% faster)

def test_many_dependencies_some_versioned(self):
    # Simulate a requirements file with many packages, some versioned
    packages = [f"package{i}" for i in range(990)] + [f"package{i}>=1.0.0" for i in range(10)]
    for i, pkg in enumerate(packages):
        if i < 990:
            codeflash_output = _is_versioned(pkg)
        else:
            codeflash_output = _is_versioned(pkg)

def test_large_string_with_operator_at_end(self):
    # Large string with operator at the very end
    s = "a" * 999 + ">"
    codeflash_output = _is_versioned(s) # 2.52μs -> 1.49μs (69.6% faster)

def test_large_string_without_operator(self):
    # Large string with no version operator
    s = "a" * 1000
    codeflash_output = _is_versioned(s) # 2.09μs -> 1.34μs (56.4% faster)

codeflash_output is used to check that the output of the original code is the same as that of the optimized code.

#------------------------------------------------
import pytest # used for our unit tests
from marimo._cli.sandbox import _is_versioned

unit tests

-------------------- Basic Test Cases --------------------

def test_basic_exact_version():
# Should detect exact version specification
codeflash_output = _is_versioned("requests==2.25.1") # 1.36μs -> 560ns (144% faster)

def test_basic_greater_than_equal_version():
# Should detect >= version specification
codeflash_output = _is_versioned("numpy>=1.18.0") # 1.35μs -> 576ns (135% faster)

def test_basic_less_than_equal_version():
# Should detect <= version specification
codeflash_output = _is_versioned("pandas<=1.3.0") # 1.34μs -> 557ns (141% faster)

def test_basic_greater_than_version():
# Should detect > version specification
codeflash_output = _is_versioned("scipy>1.5.0") # 1.46μs -> 645ns (126% faster)

def test_basic_less_than_version():
# Should detect < version specification
codeflash_output = _is_versioned("matplotlib<3.4.0") # 1.50μs -> 670ns (124% faster)

def test_basic_tilde_version():
# Should detect ~ version specification
codeflash_output = _is_versioned("pytest~6.2.4") # 1.54μs -> 674ns (128% faster)

def test_basic_no_version():
# Should NOT detect version if none is specified
codeflash_output = _is_versioned("flask") # 1.27μs -> 604ns (111% faster)

def test_basic_package_with_dash():
# Should NOT detect version if dash in package name only
codeflash_output = _is_versioned("my-package") # 1.30μs -> 642ns (102% faster)

-------------------- Edge Test Cases --------------------

def test_edge_empty_string():
# Should NOT detect version in empty string
codeflash_output = _is_versioned("") # 1.18μs -> 516ns (128% faster)

def test_edge_only_operator():
# Should detect version if only operator is present
codeflash_output = _is_versioned(">") # 1.36μs -> 501ns (171% faster)

def test_edge_operator_at_start():
# Should detect version if operator is at the start
codeflash_output = _is_versioned("==requests") # 1.19μs -> 505ns (136% faster)

def test_edge_operator_at_end():
# Should detect version if operator is at the end
codeflash_output = _is_versioned("requests==") # 1.20μs -> 493ns (144% faster)

def test_edge_multiple_operators():
# Should detect version if multiple operators are present
codeflash_output = _is_versioned("package>=1.0.0,<2.0.0") # 1.36μs -> 583ns (134% faster)

def test_edge_operator_in_package_name():
# Should NOT detect version if operator is part of the package name
codeflash_output = _is_versioned("foo>bar") # 1.38μs -> 611ns (126% faster)

def test_edge_spaces_in_string():
# Should detect version even with spaces
codeflash_output = _is_versioned("requests == 2.25.1") # 1.20μs -> 444ns (170% faster)

def test_edge_operator_in_middle():
# Should detect version if operator is in the middle
codeflash_output = _is_versioned("abc>=def") # 1.28μs -> 559ns (129% faster)

def test_edge_tilde_in_package_name():
# Should detect version if ~ is present anywhere
codeflash_output = _is_versioned("foo~bar") # 1.60μs -> 689ns (132% faster)

def test_edge_version_with_multiple_operators():
# Should detect version if multiple different operators are present
codeflash_output = _is_versioned("package>=1.0.0,<=2.0.0,~1.5") # 1.33μs -> 614ns (117% faster)

def test_edge_package_with_number():
# Should NOT detect version if only numbers in package name
codeflash_output = _is_versioned("package123") # 1.34μs -> 645ns (108% faster)

def test_edge_package_with_special_characters():
# Should NOT detect version if only special characters not in operator list
codeflash_output = _is_versioned("package@latest") # 1.28μs -> 611ns (109% faster)

def test_edge_operator_in_description():
# Should detect version if operator is in description
codeflash_output = _is_versioned("package: >=1.0.0") # 1.33μs -> 554ns (140% faster)

def test_edge_operator_in_non_version_context():
# Should detect version even if operator is not used for versioning
codeflash_output = _is_versioned("foo<bar") # 1.45μs -> 628ns (130% faster)

def test_edge_operator_with_space():
# Should detect version even if operator is surrounded by spaces
codeflash_output = _is_versioned("foo >= bar") # 1.28μs -> 582ns (120% faster)

-------------------- Large Scale Test Cases --------------------

def test_large_scale_many_non_versioned_packages():
# Test with 1000 non-versioned package names
for i in range(1000):
codeflash_output = _is_versioned(f"package{i}") # 465μs -> 196μs (137% faster)

def test_large_scale_many_versioned_packages():
# Test with 1000 versioned package names
for i in range(1000):
codeflash_output = _is_versioned(f"package{i}=={i}.0.0") # 347μs -> 127μs (173% faster)

def test_large_scale_mixed_packages():
# Test with a mix of versioned and non-versioned package names
for i in range(500):
codeflash_output = _is_versioned(f"package{i}") # 233μs -> 98.8μs (136% faster)
for i in range(500, 1000):
codeflash_output = _is_versioned(f"package{i}>=1.0.0") # 189μs -> 71.0μs (167% faster)

def test_large_scale_long_string_with_operator():
# Test with a very long string containing an operator at the end
long_name = "a" * 995 + "==1.0.0"
codeflash_output = _is_versioned(long_name) # 1.62μs -> 816ns (98.8% faster)

def test_large_scale_long_string_without_operator():
# Test with a very long string without any operator
long_name = "a" * 1000
codeflash_output = _is_versioned(long_name) # 2.13μs -> 1.50μs (41.8% faster)

-------------------- Determinism Test Case --------------------

def test_determinism():
# Repeated calls should produce the same result
codeflash_output = _is_versioned("requests==2.25.1"); result1 = codeflash_output # 1.26μs -> 533ns (136% faster)
codeflash_output = _is_versioned("requests==2.25.1"); result2 = codeflash_output # 601ns -> 212ns (183% faster)

-------------------- Type Robustness Test Cases --------------------

def test_type_non_string_input():
# Should raise TypeError if input is not a string
with pytest.raises(TypeError):
_is_versioned(None)
with pytest.raises(TypeError):
_is_versioned(123)
with pytest.raises(TypeError):
_is_versioned(["requests==2.25.1"])

codeflash_output is used to check that the output of the original code is the same as that of the optimized code.

#------------------------------------------------
from marimo._cli.sandbox import _is_versioned

def test__is_versioned():
_is_versioned('')

🔎 Concolic Coverage Tests and Runtime

Test File::Test Function	Original ⏱️	Optimized ⏱️	Speedup
codeflash_concolic_k_oa4bjc/tmpzeap1928/test_concolic_coverage.py::test__is_versioned	1.28μs	553ns	131%✅

To edit these changes git checkout codeflash/optimize-_is_versioned-mhu7w56j and push.