因此，我试图将某些值发送到flask api streamlit应用程序，但它似乎没有执行post请求。现在，我为我的 main.py 不起作用，因为我得到了一个 TypeError: 'NoneType' .
app.py：

import requests
import json
import streamlit as st
...
api_url = "http://127.0.0.1:5000/" # Flask url
create_row_data = {'name': name, 'type': get_type(name), 'token_value': token_value, 
'external': external, 'start': start, 'end': end, 'step': step}
print(create_row_data)

# The terminal cannot print out the value of r and it appears that it cannot send the post request as well

r = requests.post(url=api_url, json = create_row_data)
print(r)

产量 print(create_row_data) 在app.py中：

{'name': 'session', 'type': 'area_chart', 'token_value': 'G0as7vjk1ksuxn94', 
'external': False, 'start': datetime.datetime(2021,7,1,14,9,7,322438), 'end': datetime.datetime(2021,7,8,14,9,7,322441), 'step': '1d'}

main.py：

from flask import Flask
from flask import jsonify
from flask import request
...
import requests, json
@app.route('/', methods=['GET', 'POST'])
def get_data():
   if request.method == 'GET':
       return "ok", 200
   if request.method =='POST':
      p_name = request.json['name']
      p_type = request.json['type']
      ...
      p_end = request.json['end']
      p_step = request.json['step']
      create_row_data = {'p_name': str(p_name), 'p_type': str(p_type), ... , 'p_end': str(p_end), 'p_step': str(p_step)}
      print(create_row_data)  
      response = requests.post(url, data=json.dumps(create_row_data), headers= {'Content-type': 'application/json'}
      return response.content