def deep_merge()

in geneve/utils/__init__.py [0:0]

• 15 lines of code
• 12 McCabe index (conditional complexity)

def deep_merge(a, b, path=None, *, overwrite=False):
    """Recursively merge two dictionaries"""

    for key in b:
        if key in a:
            path = (path or []) + [str(key)]
            if isinstance(a[key], dict) and isinstance(b[key], dict):
                deep_merge(a[key], b[key], path, overwrite=overwrite)
            elif isinstance(a[key], list) and isinstance(b[key], list):
                a[key].extend(x for x in b[key] if x not in a[key])
            elif overwrite:
                a[key] = b[key]
            elif a[key] != b[key]:
                raise ValueError(f"Destination field already exists: {'.'.join(path)} ('{a[key]}' != '{b[key]}')")
        else:
            a[key] = b[key]
    return a