python requests post多層字典

pyhton requests模塊post方法傳參爲多層字典時，轉換錯誤，
如，表單傳參
{
“a”:1,
“b”:{
“A”:2,
“B”:3
}
}

post請求後看到form data是：
a:1
b:A
b:B

• 查看官方文檔：
  

More complicated POST requests
Typically, you want to send some form-encoded data — much like an HTML form. To do this, simply pass a dictionary to the data argument. Your dictionary of data will automatically be form-encoded when the request is made:

payload = {‘key1’: ‘value1’, ‘key2’: ‘value2’}

r = requests.post(“http://httpbin.org/post“, data=payload)
print(r.text)
{
…
“form”: {
“key2”: “value2”,
“key1”: “value1”
},
…
}

這裏說post傳入的dict類型參數會被自動轉化爲form-encoded，查看請求後，這裏的demo是一個一層的字典。多層字典傳輸的時候，確實會異常。

解決辦法：

將第二層字典轉化爲json，json.dumps({“A”:2,”B”:3})，然後賦給b。