Convert names from camel to snake case and vice versa.

snake_camel_conversion.py

snk1_re = re.compile(r'(.)([A-Z][a-z]+)')  # single capital preceded by any character and followed by lowercase
snk2_re = re.compile('([a-z0-9])([A-Z])')  # single capital preceded by lowercase or numeral

def to_snake(name:str):
    assert isinstance(name, str)
    nm1 = snk1_re.sub(r'\1_\2', name)
    nm2 = snk2_re.sub(r'\1_\2', nm1).lower()
    return nm2

def to_camel(name:str):
    assert isinstance(name, str)
    nm = ''.join(word.title() if idx != 0 else word for idx, word in enumerate(name.split('_')))
    return nm