nestify

nestify is a tiny utility that transforms flat dictionaries with path-like keys into proper nested structures.
Think of it as the inverse of flatten:

from nestify import nestify

data = {
    "a.b.c": 1,
    "a.d": 2,
    "x": 3
}

print(nestify(data))
# => {"a": {"b": {"c": 1}, "d": 2}, "x": 3}

✨ Features

• Custom separators
  Not limited to dots (.) — use /, :, ::, or any string as a separator.

• Conflict resolution policies
  Choose how to handle conflicts:

  • forbid_mixed: strict mode, disallow mixing dict/non-dict (default).
  • merge_dicts: merge dictionaries recursively, warn on key overlaps.
  • overwrite: always overwrite existing values, with a warning.

• Recursive processing
  Values that are dictionaries themselves are also expanded.

• Safe & predictable
  Warnings and errors make conflicts explicit, avoiding silent data corruption.

🔧 Usage Examples

Basic Expansion

from nestify import nestify

nestify({"a.b": 1, "a.c": 2})
# => {"a": {"b": 1, "c": 2}}

Custom Separator

from nestify import nestify

nestify({"root/child": 42}, separator="/")
# => {"root": {"child": 42}}

Conflict Resolution

from nestify import nestify

# Overwrite mode
nestify({"a.b": 1, "a.b": 2}, conflict_policy="overwrite")
# => {"a": {"b": 2}}

💡 Why nestify?

When working with configs, JSON/YAML, or flattened exports (from APIs, databases, etc.), you often get keys like "user.profile.name". nestify makes it effortless to convert them into proper nested dicts.

📦 Installation

pip install nestify

🧾 License

MIT License. See LICENSE for details.