簡単なWebサービスをPythonのみで作ってみた１

import json
import streamlit as st
from constants import *
from view_selector import ViewSelector


with open(Constants.prop_path, mode="r", encoding="UTF-8") as f:
    s = f.read()

menu_list = list(json.loads(s).keys())

st.title("Streamlit サンプル")

page = st.sidebar.selectbox('メニューを選択せよ', menu_list)

view_selector: ViewSelector = ViewSelector(page)
view_selector.perform_selected_logic()

class Constants():
    prop_path: str = "./config/menu.properties"

{  
    "home": "ViewHome", 
    "inquire": "ViewUser",
    "inquireAll": "ViewAllUsers",
    "register": "ViewRegister",
    "update": "ViewUpdate",
    "deleteAll": "ViewDeleteAll"
}

import json
from constants import Constants
from view_strategy import IView


class ViewSelector():

    __module_name = 'view_strategy'
    __class_name_set: dict = {}

    def __init__(self, page) -> None:
        if not any(__class__.__class_name_set):
            with open(Constants.prop_path, mode="r", encoding="UTF-8") as f:
                s = f.read()
            __class__.__class_name_set = json.loads(s)

        self.strategy: IView = self.__get_instance(page)


    def __get_instance(self, page) -> IView:
        clazz_name = __class__.__class_name_set[page]
        module = __import__(__class__.__module_name, clazz_name)
        clazz = getattr(module, clazz_name)
        return clazz()


    def perform_selected_logic(self) -> None:
        self.strategy.show_screen()

from abc import ABCMeta, abstractmethod
import json
import requests
import streamlit as st
import pandas as pd


class IView(metaclass=ABCMeta):
    _url: str = 'http://localhost:8000/api/v2/users/'

    @abstractmethod
    def show_screen(self) -> None:
        pass


class ViewHome(IView):

    def show_screen(self) -> None:
        st.title("ホーム")


class ViewAllUsers(IView):

    def show_screen(self) -> None:
        st.title("全ユーザ照会")
        with st.form(key='inquireAll'):
            submit_bottun = st.form_submit_button(label='照会')
            if submit_bottun:
                res = requests.get(self._url)
                decorded_text = res.content.decode('utf-8')
                list_data= json.loads(decorded_text)                
                st.table(list_data)
                


class ViewUser(IView):

    def show_screen(self) -> None:
        st.title("ユーザ照会")
        with st.form(key='inquire'):
            seq_nbr: str = st.text_input('シーケンス番号',key='seq')
            submit_bottun = st.form_submit_button(label='照会')
            if submit_bottun:
                res = requests.get(self._url+seq_nbr)
                decorded_text = res.content.decode('utf-8')
                list_data= json.loads(decorded_text)
                if not isinstance(list_data, list):
                    list_data = [list_data]
                st.table(list_data)


class ViewRegister(IView):

    def show_screen(self) -> None:
        st.title("ユーザ登録")
        with st.form(key='register'):
            seq_nbr: str = st.text_input('シーケンス番号')
            first_name: str = st.text_input('First Name')
            last_name: str = st.text_input('Last Name')
            gender: str = st.radio(label='性別を選択せよ',
                                   options=('female', 'male'),
                                   index=0,
                                   horizontal=True,)
            roles: str = st.radio(label='ロールを選択せよ',
                                  options=('admin', 'user'))

            payload = {
                "sequence_nbr": seq_nbr,
                "first_name": first_name,
                "last_name": last_name,
                "gender": gender,
                "roles": roles
            }
            submit_bottun: bool = st.form_submit_button(label='登録')
            if submit_bottun:
                res = requests.post(url=self._url, json=json.dumps(payload))
                if res.status_code == 200:
                    st.success('登録完了')
                st.markdown(res.text)


class ViewUpdate(IView):

    def show_screen(self) -> None:
        st.title('ユーザ情報更新')
        with st.form(key='update'):
            seq_nbr: str = st.text_input('シーケンス番号')
            first_name: str = st.text_input('First Name')
            last_name: str = st.text_input('Last Name')

            payload = {
                "sequence_nbr": seq_nbr,
                "first_name": first_name,
                "last_name": last_name
            }
            submit_bottun: bool = st.form_submit_button(label='更新')
            if submit_bottun:
                res = requests.put(url=self._url+seq_nbr,
                                   json=json.dumps(payload))
                if res.status_code == 200:
                    st.success('更新完了')
                st.markdown(res.text)


class ViewDeleteAll(IView):

    def show_screen(self) -> None:
        st.title("全ユーザ削除")
        with st.form(key='deleteAll'):
            submit_bottun: bool = st.form_submit_button(label='削除')
            if submit_bottun:
                res = requests.delete(self._url)
                if res.status_code == 200:
                    st.success('削除完了')
                st.markdown(res.text)