<s>[INST] Elegant Python function to convert CamelCase to snake_case? Example:
>>> convert('CamelCase')
'camel_case'

 [/INST] This is pretty thorough:
def convert(name):
    s1 = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', name)
    return re.sub('([a-z0-9])([A-Z])', r'\1_\2', s1).lower()

Works with all these (and doesn't harm already-un-cameled versions):
>>> convert('CamelCase')
'camel_case'
>>> convert('CamelCamelCase')
'camel_camel_case'
>>> convert('Camel2Camel2Case')
'camel2_camel2_case'
>>> convert('getHTTPResponseCode')
'get_http_response_code'
>>> convert('get2HTTPResponseCode')
'get2_http_response_code'
>>> convert('HTTPResponseCode')
'http_response_code'
>>> convert('HTTPResponseCodeXYZ')
'http_response_code_xyz'

Or if you're going to call it a zillion times, you can pre-compile the regexes:
first_cap_re = re.compile('(.)([A-Z][a-z]+)')
all_cap_re = re.compile('([a-z0-9])([A-Z])')
def convert(name):
    s1 = first_cap_re.sub(r'\1_\2', name)
    return all_cap_re.sub(r'\1_\2', s1).lower()

Don't forget to import the regular expression module
import re

 </s>