def check_requirements()

in utils/general.py [0:0]

• 28 lines of code
• 17 McCabe index (conditional complexity)

def check_requirements(requirements='requirements.txt', exclude=()):
    # Check installed dependencies meet requirements (pass *.txt file or list of packages)
    prefix = colorstr('red', 'bold', 'requirements:')
    check_python()  # check python version
    if isinstance(requirements, (str, Path)):  # requirements.txt file
        file = Path(requirements)
        if not file.exists():
            print(f"{prefix} {file.resolve()} not found, check failed.")
            return
        requirements = [f'{x.name}{x.specifier}' for x in pkg.parse_requirements(file.open()) if x.name not in exclude]
    else:  # list or tuple of packages
        requirements = [x for x in requirements if x not in exclude]

    n = 0  # number of packages updates
    for r in requirements:
        try:
            pkg.require(r)
        except Exception as e:  # DistributionNotFound or VersionConflict if requirements not met
            print(f"{prefix} {r} not found and is required by YOLOv5, attempting auto-update...")
            try:
                assert check_online(), f"'pip install {r}' skipped (offline)"
                print(check_output(f"pip install '{r}'", shell=True).decode())
                n += 1
            except Exception as e:
                print(f'{prefix} {e}')

    if n:  # if packages updated
        source = file.resolve() if 'file' in locals() else requirements
        s = f"{prefix} {n} package{'s' * (n > 1)} updated per {source}\n" \
            f"{prefix} ⚠️ {colorstr('bold', 'Restart runtime or rerun command for updates to take effect')}\n"
        print(emojis(s))  # emoji-safe