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Python Streamlit アプリ作成

python Streamlit学習 Widgets

投稿日:

Widgets

ウィジェット(Widgets)とは、グラフィカルユーザインタフェース(GUI)のインタフェース部品の総称。(テキストボックス チェックボックスなど)

スライダー入力

st.slider() スライダー表示し、入力値を取得し入力値の自乗値を表示する。

import streamlit as st
x = st.slider('x')  # 👈 this is a widget
st.write(x, 'squared is', x * x)

値11へスライドした表示

テキスト入力

import streamlit as st

title = st.text_input('Movie title', 'Life of Brian')
st.write('The current movie title is', title)

st.text_input("Your name", key="name")

# You can access the value at any point with:
st.session_state.name

初期値変更と新規入力

起動

アップグレード要求表示のため実施。

PS C:\Users\omo\test> pip install streamlit --upgrade
Requirement already satisfied: streamlit in c:\users\omo\appdata\local\programs\python\python310\lib\site-packages (1.8.1)
Collecting streamlit
Downloading streamlit-1.9.0-py2.py3-none-any.whl (10.1 MB)
---------------------------------------- 10.1/10.1 MB 8.7 MB/s eta 0:00:00
Requirement already satisfied: pillow>=6.2.0 in c:\users\omo\appdata\local\programs\python\python310\lib\site-packages (from streamlit) (9.1.0)
Requirement already satisfied: attrs in c:\users\omo\appdata\local\programs\python\python310\lib\site-packages (from streamlit) (21.4.0)
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Requirement already satisfied: widgetsnbextension~=3.6.0 in c:\users\omo\appdata\local\programs\python\python310\lib\site-packages (from ipywidgets>=7.0.0->pydeck>=0.1.dev5->streamlit) (3.6.0)
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Requirement already satisfied: pycparser in c:\users\omo\appdata\local\programs\python\python310\lib\site-packages (from cffi>=1.0.1->argon2-cffi-bindings->argon2-cffi->notebook>=4.4.1->widgetsnbextension~=3.6.0->ipywidgets>=7.0.0->pydeck>=0.1.dev5->streamlit) (2.21)
Installing collected packages: streamlit
Attempting uninstall: streamlit
Found existing installation: streamlit 1.8.1
Uninstalling streamlit-1.8.1:
Successfully uninstalled streamlit-1.8.1
Successfully installed streamlit-1.9.0
PS C:\Users\omo\test>

オプションに選択ボックスを使用

import streamlit as st
import pandas as pd

df = pd.DataFrame({
    'first column': [1, 2, 3, 4],
    'second column': [10, 20, 30, 40]
    })

option = st.selectbox(
    'Which number do you like best?',
     df['first column'])

'You selected: ', option

初期値から3へ変更

ビットコインってなに?

2008年11月、metzdowd.comにナカモトサトシにより投稿された論文Bitcoin:A Peer-to-Peer Electronic Cash Systemで定義された仕様とをもとにビットコイン・コミュニティーで開発が続けられる製造と取引に暗号学を使った通貨のことです。

ビットコイン自体は、フリー・ソフトウエアで、ソフトウェア開発のプラットフォームGitHubに登録すれば、ソースやドキュメント閲覧が可能で、開発に参加も可能です。

ナカモトサトシは、2010年12月まで開発に携わっていましたが、その後姿を消しました。日本名ですが、国籍も含め匿名性が高く身元も不明です。

真偽のほどは、不明ですがSBI社長の北尾氏が、2018年3月期第2四半期 SBIホールディングス(株)決算説明会動画の1:29:20頃)でナカモトサトシと議論を交わしたと発言して話題になりました。

ビットコインの仕組み

ビットコインは、P2P型の公開型分散台帳技術(DLT)によって信頼性を担保され運用されるブロックチェーンで結合された暗号通貨(cryptocurrency)のことです。

ビットコインは、P2Pネットワーク上のサーバー上で同一取引情報を持ちコントロールすることで取引の妥当性のチェックが行われるため、銀行など、特定の管理者がいない非中央集権型の仮想通貨と呼ばれています。

ブロックチェーン


GitHub

ブロックチェーンの動き

マイニング

ビットコインは送信アドレス(Tx)に対するデジタル署名によって保護されており、一定時間(10分)ごとに、すべての取引記録を分散台帳に追加します。

その追加処理には、ネットワーク上の分散取引台帳データと、10分間に発生したすべての取引のデータの整合性を取りながら正確に記録することが必要です。

整合性を取る作業は、膨大な計算量が必要となるため専用のハードウエアの計算能力を使って、誰でもが取引を処理することができます。

この手伝いをしてくれた人(膨大な計算処理を行った人)の中で、結果として追記処理を成功させた人には、その見返りとしてビットコインが支払われます。

この作業をマイニングと呼びます。

マイニングには、ソロマイニングとプールマイニングがあり、個人のPCでも余った演算能力でプールマイニングに参加できます。

ブロックチェーンをより深く理解する

全画面にして字幕設定を自動翻訳 イタリア語=>自動翻訳を経由して日本語に設定するとよくわかります。

上記デモは、下記リンク先サイトを使用しているので、自分でも試すことができます。

 

ジェネシス・マイニングでのハッシュパワー購入

ジェネシス・マイニングは世界最大の高く信頼されたビットコイン クラウド マイニングのプロバイダーです。ハッシュパワー購入時に,コード(kjx2uz)を使用した人は、購入時に3%の割引になります。

ブロックチェーンエクスプローラー

ブロックチェーンアドレスを入力することで、送金状況(confirmation回数の確認)が行えます。

イーサリウムの仕組み

-Python, Streamlit, アプリ作成

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