在 python 中声明正文字典时，如何按原始顺序传递请求正文

Question

当我尝试使用大型正文字典发送发布请求时，我遇到了困难。 这是代码。

body = {"session":{"user":{"user_id":"user1"}, \
"equipment":{"equipment_id_alternate":{"alternate_equipment_id_type":"sms_address", \
"alternate_equipment_id":"equipmentid1"}, \
"extensions":[{"extension_type":"string","name":"device_type","value":"PC_Apple"}, \
{"extension_type":"string","name":"device_id", \
"value":"equipmentid1"}]}, \
"content":{"content_type":"http_broadcast_channel", \
"uri":"http://xyz/abc.m3u8", \
"extensions":[{"extension_type":"integer","name":"bandwidth","value":0}, \
{"extension_type":"string","name":"stream_quality","value":"HD"}, \
{"extension_type":"string","name":"session_type","value":"Live_Linear_Companion"}]}}, \
"sa_version":"sa_http_v_1_0_1","request_type":"setup_request", \
"authentication":{"auth_algorithm":"sa_hmac_token_v_1_0_1","auth_message_algorithm":"sa_http_auth_message_v_1_0_1", \
"auth_token_start":"2016-11-23T19:49:56Z","auth_token_expiry":"2016-11-30T19:49:56Z", \
"auth_token":"abdcwgegegegege"}}

header19 = {some keys and values}
api19 = requests.post(url19, json=body, headers=header19)

我想按照声明的顺序传递请求体，我该如何实现？

我看到很多类似的问题和回复说你可以使用 collections.orderDict();但是，如果不使用 collections.orderDict() 声明每个键和值对，我不知道如何正确使用它。

谢谢。

Answer 1

普通的 dict 不跟踪插入顺序，并且迭代它会产生任意顺序的值。相比之下，在 OrderedDict 中，插入项目的顺序会被记住并在创建迭代器时使用。

import collections


print 'Regular dictionary:'
d = {}
d['a'] = 'A'
d['b'] = 'B'
d['c'] = 'C'
d['d'] = 'D'
d['e'] = 'E'

for k, v in d.items():
   print k, v

print '\nOrderedDict:'
d = collections.OrderedDict()
d['a'] = 'A'
d['b'] = 'B'
d['c'] = 'C'
d['d'] = 'D'
d['e'] = 'E'


for k, v in d.items():

 print k, v

输出将是：

Regular dictionary:
a A
c C
b B
e E
d D

OrderedDict：

a A
b B
c C
d D
e E

Answer 2

你可以试试：

from collections import OrderedDict

ordered_body = OrderedDict(body)

ordered_body 中的键顺序应与指定的相同。我认为this post 非常清楚地解释了OrderedDict。