⚡️ Speed up function _resolve_char_detection by 7%

[codeflash-ai]

📄 7% (0.07x) speedup for _resolve_char_detection in src/requests/compat.py

⏱️ Runtime : 45.8 microseconds → 42.9 microseconds (best of 457 runs)

📝 Explanation and details

Certainly! Here’s a more optimized version of the program.

Key improvements.

1. The chardet variable is eliminated as it’s not necessary for the loop's logic.
2. The function now returns immediately upon finding the module, avoiding unnecessary iterations.

✅ Correctness verification report:

Test	Status
⚙️ Existing Unit Tests	🔘 None Found
🌀 Generated Regression Tests	✅ 21 Passed
⏪ Replay Tests	🔘 None Found
🔎 Concolic Coverage Tests	🔘 None Found
📊 Tests Coverage	100.0%

🌀 Generated Regression Tests Details

import importlib

# imports
import pytest  # used for our unit tests
from src.requests.compat import _resolve_char_detection

# unit tests

def test_both_libraries_available(monkeypatch):
    """Test when both chardet and charset_normalizer are available."""
    def mock_import_module(name):
        if name == "chardet":
            return "chardet_module"
        elif name == "charset_normalizer":
            return "charset_normalizer_module"
        raise ImportError

    monkeypatch.setattr(importlib, 'import_module', mock_import_module)
    codeflash_output = _resolve_char_detection()

def test_only_first_library_available(monkeypatch):
    """Test when only chardet is available."""
    def mock_import_module(name):
        if name == "chardet":
            return "chardet_module"
        raise ImportError

    monkeypatch.setattr(importlib, 'import_module', mock_import_module)
    codeflash_output = _resolve_char_detection()

def test_only_second_library_available(monkeypatch):
    """Test when only charset_normalizer is available."""
    def mock_import_module(name):
        if name == "charset_normalizer":
            return "charset_normalizer_module"
        raise ImportError

    monkeypatch.setattr(importlib, 'import_module', mock_import_module)
    codeflash_output = _resolve_char_detection()

def test_no_libraries_available(monkeypatch):
    """Test when neither chardet nor charset_normalizer are available."""
    def mock_import_module(name):
        raise ImportError

    monkeypatch.setattr(importlib, 'import_module', mock_import_module)
    codeflash_output = _resolve_char_detection()

def test_case_sensitivity(monkeypatch):
    """Test case sensitivity of library names."""
    def mock_import_module(name):
        if name.lower() == "chardet":
            return "chardet_module"
        raise ImportError

    monkeypatch.setattr(importlib, 'import_module', mock_import_module)
    codeflash_output = _resolve_char_detection()

def test_partial_availability(monkeypatch):
    """Test partial availability of libraries."""
    def mock_import_module(name):
        if name == "chardet":
            raise ImportError("Partial installation")
        elif name == "charset_normalizer":
            return "charset_normalizer_module"
        raise ImportError

    monkeypatch.setattr(importlib, 'import_module', mock_import_module)
    codeflash_output = _resolve_char_detection()

def test_large_number_of_libraries(monkeypatch):
    """Test performance with a large number of libraries."""
    def mock_import_module(name):
        if name == "lib_999":
            return "lib_999_module"
        raise ImportError

    monkeypatch.setattr(importlib, 'import_module', mock_import_module)
    
    def extended_resolve_char_detection():
        chardet = None
        for i in range(1000):
            lib = f"lib_{i}"
            if chardet is None:
                try:
                    chardet = importlib.import_module(lib)
                except ImportError:
                    pass
        return chardet

def test_no_side_effects(monkeypatch):
    """Ensure no side effects or global state modifications."""
    global_var = "unchanged"

    def mock_import_module(name):
        return None

    monkeypatch.setattr(importlib, 'import_module', mock_import_module)
    _resolve_char_detection()
# codeflash_output is used to check that the output of the original code is the same as that of the optimized code.

import importlib

# imports
import pytest  # used for our unit tests
from src.requests.compat import _resolve_char_detection


# unit tests
def test_both_libraries_available(monkeypatch):
    """Test when both chardet and charset_normalizer are available."""
    def mock_import_module(name):
        if name == "chardet":
            return "mock_chardet"
        elif name == "charset_normalizer":
            return "mock_charset_normalizer"
        raise ImportError
    
    monkeypatch.setattr(importlib, "import_module", mock_import_module)
    codeflash_output = _resolve_char_detection()

def test_only_chardet_available(monkeypatch):
    """Test when only chardet is available."""
    def mock_import_module(name):
        if name == "chardet":
            return "mock_chardet"
        raise ImportError
    
    monkeypatch.setattr(importlib, "import_module", mock_import_module)
    codeflash_output = _resolve_char_detection()

def test_only_charset_normalizer_available(monkeypatch):
    """Test when only charset_normalizer is available."""
    def mock_import_module(name):
        if name == "charset_normalizer":
            return "mock_charset_normalizer"
        raise ImportError
    
    monkeypatch.setattr(importlib, "import_module", mock_import_module)
    codeflash_output = _resolve_char_detection()

def test_neither_library_available(monkeypatch):
    """Test when neither chardet nor charset_normalizer is available."""
    def mock_import_module(name):
        raise ImportError
    
    monkeypatch.setattr(importlib, "import_module", mock_import_module)
    codeflash_output = _resolve_char_detection()

def test_similar_named_libraries(monkeypatch):
    """Test when libraries with similar names are available."""
    def mock_import_module(name):
        if name == "chardet2" or name == "charset_normalizer2":
            return f"mock_{name}"
        raise ImportError
    
    monkeypatch.setattr(importlib, "import_module", mock_import_module)
    codeflash_output = _resolve_char_detection()

def test_partial_installation_chardet(monkeypatch):
    """Test when chardet is partially installed but not importable."""
    def mock_import_module(name):
        if name == "chardet":
            raise ImportError
        elif name == "charset_normalizer":
            return "mock_charset_normalizer"
    
    monkeypatch.setattr(importlib, "import_module", mock_import_module)
    codeflash_output = _resolve_char_detection()

def test_partial_installation_charset_normalizer(monkeypatch):
    """Test when charset_normalizer is partially installed but not importable."""
    def mock_import_module(name):
        if name == "charset_normalizer":
            raise ImportError
        elif name == "chardet":
            return "mock_chardet"
    
    monkeypatch.setattr(importlib, "import_module", mock_import_module)
    codeflash_output = _resolve_char_detection()

def test_unexpected_exception(monkeypatch):
    """Test when importlib.import_module raises an unexpected exception."""
    def mock_import_module(name):
        if name == "chardet" or name == "charset_normalizer":
            raise RuntimeError("Unexpected error")
    
    monkeypatch.setattr(importlib, "import_module", mock_import_module)
    with pytest.raises(RuntimeError):
        _resolve_char_detection()

def test_dynamic_module_removal_chardet(monkeypatch):
    """Test when chardet is dynamically removed during execution."""
    def mock_import_module(name):
        if name == "chardet":
            raise ImportError
        elif name == "charset_normalizer":
            return "mock_charset_normalizer"
    
    monkeypatch.setattr(importlib, "import_module", mock_import_module)
    codeflash_output = _resolve_char_detection()

def test_dynamic_module_removal_charset_normalizer(monkeypatch):
    """Test when charset_normalizer is dynamically removed during execution."""
    def mock_import_module(name):
        if name == "charset_normalizer":
            raise ImportError
        elif name == "chardet":
            return "mock_chardet"
    
    monkeypatch.setattr(importlib, "import_module", mock_import_module)
    codeflash_output = _resolve_char_detection()

def test_permission_issues(monkeypatch):
    """Test when user does not have permission to import certain modules."""
    def mock_import_module(name):
        raise ImportError("Permission denied")
    
    monkeypatch.setattr(importlib, "import_module", mock_import_module)
    codeflash_output = _resolve_char_detection()

def test_unexpected_module_contents(monkeypatch):
    """Test when the module is present but does not contain expected attributes."""
    def mock_import_module(name):
        if name == "chardet":
            return "mock_chardet"
        elif name == "charset_normalizer":
            return "mock_charset_normalizer"
    
    monkeypatch.setattr(importlib, "import_module", mock_import_module)
    codeflash_output = _resolve_char_detection()

def test_conflicting_library_versions(monkeypatch):
    """Test when multiple versions of the libraries are installed."""
    def mock_import_module(name):
        if name == "chardet":
            return "mock_chardet_v1"
        elif name == "charset_normalizer":
            return "mock_charset_normalizer_v1"
    
    monkeypatch.setattr(importlib, "import_module", mock_import_module)
    codeflash_output = _resolve_char_detection()
# codeflash_output is used to check that the output of the original code is the same as that of the optimized code.

from src.requests.compat import _resolve_char_detection

def test__resolve_char_detection():
    assert _resolve_char_detection() == <module 'charset_normalizer' from '/home/alvin/miniforge3/envs/requests/lib/python3.12/site-packages/charset_normalizer/__init__.py'>

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