simple web3.py example for accessing to smart contract on Polygon

sample1.py

from web3 import Web3
from web3.middleware import geth_poa_middleware

#MyStraget.solにweb3.pyでアクセス
def main():

	#自分のウォレットのアドレスとプレイベートキー
	wallet = "0x...[ウォレットアドレス]"
	key = "[プライベートキー]"

	#接続するチェーン
	#rpc_addr = "http://127.0.0.1:8545" #local geth
	rpc_addr = "https://polygon-rpc.com" #polygon

	#デプロイしたスマートコントラクトの情報↓以下は私がデプロイしたやつなので自分の情報に変更する
	#abiはjson形式なのでpythonソース中にそのまま貼り付け可能。PyCharmなら折り畳み表示可能
	addr = "0x8b02EB24A5b1af257E22C520406C3dD9c1B55fd8"  # polygon
	abi = [
		{
			"inputs": [],
			"name": "get",
			"outputs": [
				{
					"internalType": "string",
					"name": "",
					"type": "string"
				}
			],
			"stateMutability": "view",
			"type": "function"
		},
		{
			"inputs": [
				{
					"internalType": "string",
					"name": "_message",
					"type": "string"
				}
			],
			"name": "set",
			"outputs": [],
			"stateMutability": "nonpayable",
			"type": "function"
		}
	]

	web3 = Web3(Web3.HTTPProvider(rpc_addr))
	#https://chowdera.com/2021/11/20211124152801551d.html
	web3.middleware_onion.inject(geth_poa_middleware, layer=0)
	print("isConnect", web3.isConnected())
	if( web3.isConnected() != True ):
		return

	strage = web3.eth.contract(address=addr, abi=abi)
	print("strage=", strage)


	#参照系
	ret = strage.functions.get().call()
	print("ret=", ret)


	#更新系
	nonce = web3.eth.getTransactionCount(wallet)
	func = strage.functions.set("hello")

	transaction = func.buildTransaction()
	transaction.update({ 'nonce' : nonce })

	signed_tx = web3.eth.account.sign_transaction(transaction, key)
	tx_hash = web3.eth.sendRawTransaction(signed_tx.rawTransaction)
	result = web3.eth.wait_for_transaction_receipt(tx_hash)
	print("resut=", result)

if __name__ == '__main__':
    main()
    print("end")