pyhannom 0.1.2

A Python toolkit for the digitization of Han-Nom characters, enabling AI and natural language processing applications with Vietnamese Han-Nom data.

PyHanNom

📖 Introduction

PyHanNom is a Python package dedicated to the modernization and digitization of Han-Nom characters, the classical script system of Vietnam. In the era of artificial intelligence, where Python has become the dominant language for computation and research, it is essential to provide robust tools that connect modern Vietnamese Latin script (Quốc Ngữ) with its Han-Nom heritage.

This package offers a foundation for computational work with Han-Nom by enabling bidirectional lookup and conversion ↔️ at both the syllable, character, and word levels. Beyond simple character matching, PyHanNom is designed as part of a broader effort to make Han-Nom resources machine-readable 💻, searchable 🔍, and ready for integration into AI-driven applications 🚀.

By bridging modern orthography with historical scripts, PyHanNom contributes to:

• 🏛️ the preservation and revival of Han-Nom in digital form,
• 📚 the development of linguistic resources for computational linguistics and digital humanities,
• 🔮 and the future of AI applications, such as building parallel corpora between Latin Vietnamese and Han-Nom, or supporting natural language processing tasks.

PyHanNom is therefore not only a practical tool for researchers and developers today, but also a step toward the long-term goal of bringing Han-Nom into the digital and AI era 🌏.

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📂 Data Source

• This project includes data derived from the "委班復生漢喃越南 Uỷ ban Phục sinh Hán Nôm Việt Nam" project:
  • https://www.hannom-rcv.org/BCHNCTD.html
  • https://www.hannom-rcv.org/Lookup-CHNC.html
• All rights to the original data belong to the 委班復生漢喃越南 Ủy ban Phục sinh Hán Nôm Việt Nam.
• The data included in this package is provided strictly for research and educational purposes. Commercial use of the data is NOT permitted.
• Since the mappings are directly derived from this source, all case handling and annotations in PyHanNom remain exactly consistent with the original data. For details, please refer to the original source above.

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⚙️ Installation

pip install pyhannom

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🚀 Usage

1. Load the syllable–character table

Before using any lookup functions, you need to load the Han-Nom syllable–character mapping table:

from pyhannom import load_syllable_char_table

hannom_syllable_char_table = load_syllable_char_table()

This hannom_syllable_char_table handle must be passed into the following functions.

Function signature

load_syllable_char_table()

• returns: a syllable/character-level mapping table to be used with syllable/character-level functions.

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2. Convert Latin syllable → Han-Nom character

Use get_chuhannom_from_latin to retrieve the Han-Nom character(s) corresponding to a given Vietnamese Latin syllable.

Each Han-Nom character in the bracket is the simplified version of the one outside the bracket.

from pyhannom import get_chuhannom_from_latin

result = get_chuhannom_from_latin(
    hannom_syllable_char_table,
    "buộc"
)
print(result)  # e.g. ['𫃚']

from pyhannom import get_chuhannom_from_latin

result = get_chuhannom_from_latin(
    hannom_syllable_char_table,
    "anh"
)
print(result)  # e.g. ['英', '英', '映', '罌', '嚶', '櫻', '鶯（𦾉）', '鸚']

Function signature

get_chuhannom_from_latin(
    handle,
    input_latin_syllable: str,
    normalize_input_case: bool = True,
    case_insensitive_match: bool = True
)

• handle: the syllable–character table loaded by load_syllable_char_table.
• input_latin_syllable (str): a single Vietnamese syllable in Latin script.
• normalize_input_case (bool, default=True): whether to normalize the input to lowercase before matching.
• case_insensitive_match (bool, default=True): whether to perform case-insensitive matching.
• returns: a list of the matched Han-Nom characters corresponding to the input syllable.

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3. Convert Latin syllable → Han-Nom Unicode code points

Use get_chuhannom_unicode_from_latin to retrieve the Unicode code points of the Han-Nom character(s) corresponding to a given Vietnamese Latin syllable.

This function has the same input parameters as get_chuhannom_from_latin, but instead of returning the characters themselves, it returns their Unicode representations.

Each Unicode code point in the bracket represents the Unicode code point of the Han-Nom character in the bracket introduced in the last section.

from pyhannom import get_chuhannom_unicode_from_latin

result = get_chuhannom_unicode_from_latin(
    hannom_syllable_char_table,
    "buộc"
)
print(result)  # e.g. ['U+2B0DA']

from pyhannom import get_chuhannom_unicode_from_latin

result = get_chuhannom_unicode_from_latin(
    hannom_syllable_char_table,
    "anh"
)
print(result)  
# e.g. ['U+82F1', 'U+82F1', 'U+6620', 'U+7F4C', 'U+56B6', 'U+6AFB', 'U+9DAF (U+26F89)', 'U+9E1A']

Function signature

get_chuhannom_unicode_from_latin(
    handle,
    input_latin_syllable: str,
    normalize_input_case: bool = True,
    case_insensitive_match: bool = True
)

• handle: the syllable–character table loaded by load_syllable_char_table.
• input_latin_syllable (str): a single Vietnamese syllable in Latin script.
• normalize_input_case (bool, default=True): whether to normalize the input to lowercase before matching.
• case_insensitive_match (bool, default=True): whether to perform case-insensitive matching.
• returns: a list of Unicode code points (as strings) corresponding to the matched Han-Nom characters.

---

4. Convert Han-Nom character → Latin syllable

Use get_latin_from_chuhannom to retrieve the Vietnamese Latin syllable(s) corresponding to a given Han-Nom character.

from pyhannom import get_latin_from_chuhannom

result = get_latin_from_chuhannom(
    hannom_syllable_char_table,
    "心"
)
print(result)  # e.g. ['TÂM', 'tim']

Function signature

get_latin_from_chuhannom(
    handle,
    input_chuhannom: str,
    normalize_output_case: bool = False
)

• handle: the syllable–character table loaded by load_syllable_char_table.
• input_chuhannom (str): a single Han-Nom character.
• normalize_output_case (bool, default=False): whether to normalize all returned Latin syllables to lowercase.
• returns: a list of corresponding Vietnamese Latin syllables.

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5. Load the word-level table

Before using word-level lookup functions, you need to load the Han-Nom word-level mapping table.

This table is built on top of the syllable–character table:

from pyhannom import load_word_table

hannom_word_table = load_word_table(hannom_syllable_char_table)

Function signature

load_word_table(handle)

• handle: the syllable–character table loaded by load_syllable_char_table.
• returns: a word-level mapping table to be used with word-level functions.

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6. Convert Latin syllables → Han-Nom words

Use get_chuhannom_word_from_latin to retrieve Han-Nom word(s) corresponding to a given sequence of Vietnamese Latin syllables.

The function checks whether all provided Latin syllables occur as substrings within a Latin word in the word-level dictionary. If this condition is satisfied, it returns all matching Han-Nom words together with their Latin equivalents (and optional annotations).

from pyhannom import get_chuhannom_word_from_latin

result = get_chuhannom_word_from_latin(
    hannom_word_table,
    "ác tâ"
)
print(result)
# e.g. {('革新', 'cách tân'), ('賓客', 'tân khách'), ('惡心', 'ác tâm')}

from pyhannom import get_chuhannom_word_from_latin

result = get_chuhannom_word_from_latin(
    hannom_word_table,
    "hưng hửng"
)
print(result)
# e.g. {('烝𬋙', 'chưng hửng', '[𠸨]'), ('𬋙𬋙', 'hưng hửng', '[𠸨]')}

Function signature

get_chuhannom_word_from_latin(
    handle,
    input_latin_syllables: str,
    normalize_input_case: bool = False,
    case_insensitive_match: bool = True
)

• handle: the word-level table loaded by load_word_table.
• input_latin_syllables (str): one or more Vietnamese Latin syllables.
• normalize_input_case (bool, default=False): whether to normalize the input to lowercase before matching.
• case_insensitive_match (bool, default=True): whether to perform case-insensitive matching.
• returns: a set of tuples. Each tuple contains:
  1. Han-Nom word (string)
  2. Corresponding Latin word (string)
  3. Optional annotation (string, may not always be present)

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7. Convert Han-Nom words → Latin words

Use get_latin_word_from_chuhannom to retrieve the Vietnamese Latin word(s) corresponding to a given Han-Nom word or phrase.
The function checks whether the provided Han-Nom string (one or more characters) occurs as a substring within any Han-Nom word in the word-level dictionary. If this condition is satisfied, it returns all matching words together with their Latin equivalents (and optional annotations).

from pyhannom import get_latin_word_from_chuhannom

result = get_latin_word_from_chuhannom(
    hannom_word_table,
    "稱雄"
)
print(result)
# e.g. {('稱雄', 'xưng hùng'), ('稱雄稱霸', 'xưng hùng xưng bá')}

from pyhannom import get_latin_word_from_chuhannom

result = get_latin_word_from_chuhannom(
    hannom_word_table,
    "汴𠲅"
)
print(result)
# e.g. {('汴𠲅', 'bin (pin) sạc', '[摱]')}

Function signature

get_latin_word_from_chuhannom(
    handle,
    input_chuhannom: str,
    normalize_output_case: bool = False
)

• handle: the word-level table loaded by load_word_table.
• input_chuhannom (str): one or more Han-Nom characters forming a string.
• normalize_output_case (bool, default=False): whether to normalize all returned Latin words to lowercase.
• returns: a set of tuples. Each tuple contains:
  1. Han-Nom word (string)
  2. Corresponding Latin word (string)
  3. Optional annotation (string, may not always be present)

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📜 License

• Code: Licensed under the MIT License.
• Data: Derived from the 委班復生漢喃越南 Ủy ban Phục sinh Hán Nôm Việt Nam project. Redistribution or modification of the data must include proper attribution and comply with the requirements set by the original source.

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🤝 Contributing

• Pull requests are welcome.
• For major changes, please open an issue first to discuss what you’d like to change.
• Make sure to update tests as appropriate.

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🌏 Acknowledgments

• This project makes use of data derived from the "委班復生漢喃越南 Uỷ ban Phục sinh Hán Nôm Việt Nam" project:
  • https://www.hannom-rcv.org/BCHNCTD.html
  • https://www.hannom-rcv.org/Lookup-CHNC.html
• All rights to the original data belong to the 委班復生漢喃越南 Ủy ban Phục sinh Hán Nôm Việt Nam.
• I would like to express my gratitude to the open-source Han-Nom community and the 委班復生漢喃越南 Ủy ban Phục sinh Hán Nôm Việt Nam project for making these resources available for research and educational purposes.
• If there is any infringement or concern regarding the use of this data, please contact me immediately. I will respond promptly to resolve the issue, including the possibility of removing this project if necessary.

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