看一看优秀的Schematics库

https://github.com/schematics/schematics

它允许你创建类型化的数据结构，可以序列化/反序列化从python到Javascript风格，例如:

class MapPrice(Model):
    price_before_vat = DecimalType(serialized_name='priceBeforeVat')
    vat_rate = DecimalType(serialized_name='vatRate')
    vat = DecimalType()
    total_price = DecimalType(serialized_name='totalPrice')

看一看优秀的Schematics库

https://github.com/schematics/schematics

它允许你创建类型化的数据结构，可以序列化/反序列化从python到Javascript风格，例如:

class MapPrice(Model):
    price_before_vat = DecimalType(serialized_name='priceBeforeVat')
    vat_rate = DecimalType(serialized_name='vatRate')
    vat = DecimalType()
    total_price = DecimalType(serialized_name='totalPrice')

如果你使用谷歌的(几乎)确定性骆驼案例算法，那么就不需要处理像HTMLDocument这样的东西，因为它应该是HTMLDocument，那么这种基于正则表达式的方法很简单。它用下划线替换所有的大写字母或数字。Note不处理多位数数字。

import re

def to_snake_case(camel_str):
    return re.sub('([A-Z0-9])', r'_\1', camel_str).lower().lstrip('_')

这么多复杂的方法…… 只需找到所有“标题”组，并加入其小写变体与下划线。

>>> import re
>>> def camel_to_snake(string):
...     groups = re.findall('([A-z0-9][a-z]*)', string)
...     return '_'.join([i.lower() for i in groups])
...
>>> camel_to_snake('ABCPingPongByTheWay2KWhereIsOurBorderlands3???')
'a_b_c_ping_pong_by_the_way_2_k_where_is_our_borderlands_3'

如果你不想让数字像组的第一个字符或单独的组-你可以使用([A-z][a-z0-9]*)掩码。

没有任何库:

def camelify(out):
    return (''.join(["_"+x.lower() if i<len(out)-1 and x.isupper() and out[i+1].islower()
         else x.lower()+"_" if i<len(out)-1 and x.islower() and out[i+1].isupper()
         else x.lower() for i,x in enumerate(list(out))])).lstrip('_').replace('__','_')

有点重，但是

CamelCamelCamelCase ->  camel_camel_camel_case
HTTPRequest         ->  http_request
GetHTTPRequest      ->  get_http_request
getHTTPRequest      ->  get_http_request

骆驼案变蛇案

import re

name = 'CamelCaseName'
name = re.sub(r'(?<!^)(?=[A-Z])', '_', name).lower()
print(name)  # camel_case_name

如果你这样做了很多次，上面的速度很慢，提前编译正则表达式:

pattern = re.compile(r'(?<!^)(?=[A-Z])')
name = pattern.sub('_', name).lower()

为了处理更高级的情况(这是不可逆的了):

def camel_to_snake(name):
    name = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', name)
    return re.sub('([a-z0-9])([A-Z])', r'\1_\2', name).lower()

print(camel_to_snake('camel2_camel2_case'))  # camel2_camel2_case
print(camel_to_snake('getHTTPResponseCode'))  # get_http_response_code
print(camel_to_snake('HTTPResponseCodeXYZ'))  # http_response_code_xyz

添加带有两个或两个以上下划线的also大小写:

def to_snake_case(name):
    name = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', name)
    name = re.sub('__([A-Z])', r'_\1', name)
    name = re.sub('([a-z0-9])([A-Z])', r'\1_\2', name)
    return name.lower()

斯内克案转帕斯卡案

name = 'snake_case_name'
name = ''.join(word.title() for word in name.split('_'))
print(name)  # SnakeCaseName