{"id":245706,"date":"2023-09-11T03:55:51","date_gmt":"2023-09-10T19:55:51","guid":{"rendered":"https:\/\/www.idc.net\/help\/245706\/"},"modified":"2023-09-11T03:55:51","modified_gmt":"2023-09-10T19:55:51","slug":"%e7%94%a8web3-py%e3%80%81infura%e5%92%8cgraph%e6%9f%a5%e8%af%a2%e4%bb%a5%e5%a4%aa%e5%9d%8a%e6%95%b0%e6%8d%ae","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/245706\/","title":{"rendered":"\u7528Web3.py\u3001Infura\u548cGraph\u67e5\u8be2\u4ee5\u592a\u574a\u6570\u636e"},"content":{"rendered":"

\n

Web3.py\u662f\u4e00\u4e2a\u4e3a\u4e0eEthereum\u533a\u5757\u94fe\u4ea4\u4e92\u800c\u5efa\u7acb\u7684Python\u5e93\u3002\u6709\u4e86\u5b83\uff0c\u6211\u4eec\u53ef\u4ee5\u4e3a\u53bb\u4e2d\u5fc3\u5316\u7684\u5e94\u7528\u7a0b\u5e8f\u5efa\u7acb\u5404\u79cd\u6838\u5fc3\u529f\u80fd\u3002\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u4e0e\u667a\u80fd\u5408\u7ea6\u4e92\u52a8\uff0c\u6536\u96c6\u533a\u5757\u94fe\u6570\u636e\uff0c\u5e76\u53d1\u9001\u4ea4\u6613\u3002\u8ba9\u6211\u4eec\u5f00\u59cb\u5b89\u88c5Web3.py\u3002<\/span><\/p>\n

pip<\/span> install<\/span> web3<\/span>

<\/pre>\n
Web3.py\u7684\u529f\u80fd\u662f\u8fde\u63a5\u5230\u4ee5\u592a\u574a\u7f51\u7edc\u7684\u8282\u70b9\uff0c\u4ee5\u68c0\u7d22\u6570\u636e\u548c\u5411\u7f51\u7edc\u5e7f\u64ad\u6570\u636e\u3002\u8282\u70b9\u5b58\u50a8\u533a\u5757\u94fe\u6570\u636e\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u67e5\u8be2\u4ee5\u592a\u574a\u533a\u5757\u94fe\u7684\u72b6\u6001\u6765\u6536\u96c6\u6211\u4eec\u9700\u8981\u7684\u6570\u636e\u3002\u6570\u636e\u68c0\u7d22\u5bf9\u6211\u4eec\u6765\u8bf4\u662f\u4e00\u4e2a\u6709\u6548\u7684\u514d\u8d39\u64cd\u4f5c\uff0c\u56e0\u4e3a\u552f\u4e00\u7684\u6210\u672c\u662f\u8282\u70b9\u6b63\u5728\u8fdb\u884c\u7684\u5b58\u50a8\u548c\u8ba1\u7b97\u3002\u6709\u4e86\u8fd9\u4e2a\u5e93\uff0c\u6211\u4eec\u53ef\u4ee5\u8fde\u63a5\u5230\u81ea\u5df1\u7684\u8282\u70b9\u6216\u7f51\u7edc\u4e0a\u7684\u73b0\u6709\u8282\u70b9\u6765\u5efa\u7acb\u6211\u4eec\u60f3\u8981\u7684\u4e1c\u897f\u3002\u6211\u4eec\u53ef\u4ee5\u5728\u81ea\u5df1\u7684\u673a\u5668\u4e0a\u5efa\u7acb\u4e00\u4e2a\u672c\u5730\u8282\u70b9\uff0c\u4f46\u8fd9\u6837\u505a\u7684\u6210\u672c\u662f\u76f8\u5f53\u9ad8\u7684\uff1b\u622a\u81f34\/21\uff0c\u4e00\u4e2a\u5b8c\u6574\u7684\u8282\u70b9\u5927\u7ea6\u67097TB\u7684\u6570\u636e\u3002\u4e0e\u5176\u5728\u6211\u4eec\u60f3\u8981\u8bbf\u95ee\u6570\u636e\u65f6\u64cd\u4f5c\u81ea\u5df1\u7684\u8282\u70b9\uff0c\u4e0d\u5982\u901a\u8fc7\u4f7f\u7528\u50cfInfura\u8fd9\u6837\u7684\u670d\u52a1\u6765\u8fbe\u5230\u76ee\u7684\u3002Infura\u662fConsensys\u7684\u4ea7\u54c1\uff0c\u6211\u4eec\u5c06\u4f7f\u7528\u5b83\u4f5c\u4e3a\u6211\u4eec\u7684\u8282\u70b9\uff0c\u8fde\u63a5\u5230\u4ee5\u592a\u574a\u533a\u5757\u94fe\u3002\u8bb8\u591a\u9876\u7ea7\u9879\u76ee\u90fd\u662fInfura\u7684\u7528\u6237\u3002\u9996\u5148\u5728Infura\u7f51\u7ad9\u6ce8\u518c\u5e76\u521b\u5efa\u4e00\u4e2a\u65b0\u9879\u76ee\u3002\u5728\u90a3\u91cc\u4f60\u4f1a\u53d1\u73b0\u4e00\u4e2a\u9879\u76eeID\u3002<\/span><\/p>\n
\n
\u8be5\u9879\u76eeID\u5c06\u88ab\u653e\u5728Web3.py\u7684\u8fd9\u6bb5\u4ee3\u7801\u4e2d\u7684\u672b\u5c3e\uff0c\u5b83\u5c06\u5b9a\u4e49\u4f60\u8981\u8fde\u63a5\u5230\u7684\u8282\u70b9\u3002<\/span><\/p>\n
from<\/span> web3<\/span> importWeb3<\/span>

w3<\/span> =<\/span> Web3<\/span>(Web3<\/span>.HTTPProvider<\/span>('https:\/\/mainnet.infura.io\/v3\/YOUR_PROJECT_ID'<\/span>))


<\/pre>\n
\u73b0\u5728\u5df2\u7ecf\u51c6\u5907\u597d\u4e86\u4e0e\u4ee5\u592a\u574a\u7f51\u7edc\u7684\u8fde\u63a5\uff0c\u53ef\u4ee5\u505a\u4e00\u4e9b\u57fa\u672c\u7684\u67e5\u8be2\u3002<\/span><\/p>\n
# Get information about the latest block<\/span>
w3<\/span>.eth<\/span>.getBlock<\/span>('latest'<\/span>)

# Get the ETH balance of an address<\/span>
w3<\/span>.eth<\/span>.getBalance<\/span>('YOUR_ADDRESS_HERE'<\/span>)


<\/pre>\n
\u8fd9\u6bb5\u4ee3\u7801\u5f88\u7b80\u6d01\uff0c\u6211\u4eec\u53ef\u4ee5\u8bd5\u7740\u6df1\u5165\u6316\u6398\u4e00\u4e0b\u3002\u6bd4\u5982\u6a21\u4effZapper\uff08 <\/span>\u200b\u200b\u200b\u200bhttps:\/\/zapper.fi\/dashboard\u200b\u200b<\/span>\u200b<\/code>\u200b\uff09\u8fd9\u6837\u7684\u4ea7\u54c1\u529f\u80fd\uff0c\u8ddf\u8e2a\u6211\u4eec\u4ee3\u5e01\u7684\u7f8e\u5143\u4ef7\u503c\u5982\u4f55\uff1f\u9996\u5148\uff0c\u9700\u8981\u626b\u63cf\u6211\u4eec\u7684\u5730\u5740\uff0c\u770b\u770b\u6301\u6709\u54ea\u4e9b\u4ee3\u5e01\u3002\u4e3a\u4e86\u505a\u5230\u8fd9\u4e00\u70b9\uff0c\u6211\u4eec\u5c06\u4e0e\u5404\u4e2a\u4ee3\u5e01\u7684\u667a\u80fd\u5408\u7ea6\u8fdb\u884c\u4ea4\u4e92\u3002\u8fd9\u4e9b\u5408\u7ea6\u7684\u5730\u5740\u770b\u8d77\u6765\u50cf\u6211\u4eec\u7684\u94b1\u5305\u5730\u5740\uff0c\u53ea\u4e0d\u8fc7\u8fd9\u4e9b\u662f\u5408\u7ea6\u5730\u5740\u3002\u5728\u8fd9\u4e2a\u5730\u5740\u4e0a\u6709\u667a\u80fd\u5408\u7ea6\u4ee3\u7801\u3002\u4ee3\u5e01\u5c06\u9075\u5b88ERC-20\u6807\u51c6\uff0c\u4f7f\u6211\u4eec\u66f4\u5bb9\u6613\u4e0e\u8fd9\u4e9b\u5408\u7ea6\u8fdb\u884c\u4ea4\u4e92\u3002\u4e00\u4e2aERC-20\u5408\u7ea6\u9ed8\u8ba4\u5177\u6709\u4ee5\u4e0b\u529f\u80fd\uff1a<\/span><\/p>\n
function<\/span> name<\/span>() public<\/span> view<\/span> returns<\/span> (string<\/span>)
function<\/span> symbol<\/span>() public<\/span> view<\/span> returns<\/span> (string<\/span>)
function<\/span> decimals<\/span>() public<\/span> view<\/span> returns<\/span> (uint8<\/span>)
function<\/span> totalSupply<\/span>() public<\/span> view<\/span> returns<\/span> (uint256<\/span>)
function<\/span> balanceOf<\/span>(address<\/span> _owner<\/span>) public<\/span> view<\/span> returns<\/span> (uint256<\/span> balance<\/span>)
function<\/span> transfer<\/span>(address<\/span> _to<\/span>, uint256<\/span> _value<\/span>) public<\/span> returns<\/span> (bool<\/span> success<\/span>)
function<\/span> transferFrom<\/span>(address<\/span> _from<\/span>, address<\/span> _to<\/span>, uint256<\/span> _value<\/span>) public<\/span> returns<\/span> (bool<\/span> success<\/span>)
function<\/span> approve<\/span>(address<\/span> _spender<\/span>, uint256<\/span> _value<\/span>) public<\/span> returns<\/span> (bool<\/span> success<\/span>)
function<\/span> allowance<\/span>(address<\/span> _owner<\/span>, address<\/span> _spender<\/span>) public<\/span> view<\/span> returns<\/span> (uint256<\/span> remaining<\/span>)


<\/pre>\n
\u200b\u200bbalanceOf<\/span>\u200b<\/code>\u200b\u662f\u8ba9\u6211\u4eec\u770b\u5230\u6211\u4eec\u67e5\u8be2\u7684\u94b1\u5305\u5730\u5740\u6301\u6709\u591a\u5c11\u4ee3\u5e01\u7684\u51fd\u6570\u3002<\/span><\/p>\n
import<\/span> json<\/span>

ABI<\/span> =<\/span> json<\/span>.loads<\/span>('[{\"constant\":true,\"inputs\":[{\"name\":\"_owner\",\"type\":\"address\"}],\"name\":\"balanceOf\",<\/span>
                    \"outputs\"<\/span>:[{\"name\"<\/span>:\"\"<\/span>,\"type\"<\/span>:\"uint256\"<\/span>}],\"payable\"<\/span>:false<\/span>,\"stateMutability\"<\/span>:\"view\"<\/span>,\"type\"<\/span>:\"function\"<\/span>}<\/span>]<\/span>')<\/span>


<\/pre>\n
\u6211\u4eec\u4ece\u5b9a\u4e49\u4e00\u4e2aABI\u5f00\u59cb\u3002ABI\uff08 application binary interface\uff09\u662f\u6211\u4eec\u5b9a\u4e49\u7684\u4e00\u79cd\u683c\u5f0f\uff0c\u7528\u4e8e\u4e0e\u5408\u7ea6\u4ea4\u4e92\u3002\u5b83\u662f\u6211\u4eec\u7528\u6765\u5b9a\u4e49\u6570\u636e\u5728EVM\u4e2d\u5e94\u8be5\u5982\u4f55\u7f16\u7801\/\u89e3\u7801\u7684\u3002\u629b\u5f00\u6280\u672f\u7ec6\u8282\uff0c\u91cd\u8981\u7684\u662f\u8981\u7406\u89e3\u5b83\u662f\u6211\u4eec\u5b9a\u4e49\u7684\u683c\u5f0f\uff0c\u6211\u4eec\u5c06\u5982\u4f55\u4e0e\u6211\u4eec\u60f3\u8981\u7684\u667a\u80fd\u5408\u7ea6\u8fdb\u884c\u4ea4\u4e92\u3002<\/span><\/p>\n
wallet_address<\/span> =<\/span> 'YOUR_ADDRESS_HERE'<\/span>
wallet_address<\/span> =<\/span> Web3<\/span>.toChecksumAddress<\/span>(wallet_address<\/span>)

token_contract_address<\/span> =<\/span> '0xc011a73ee8576fb46f5e1c5751ca3b9fe0af2a6f'<\/span>
token_contract_address<\/span> =<\/span> Web3<\/span>.toChecksumAddress<\/span>(token_contract_address<\/span>)

# define contract<\/span>
contract<\/span> =<\/span> w3<\/span>.eth<\/span>.contract<\/span>(token_contract_address<\/span>, abi<\/span>=<\/span>ABI<\/span>)

# call contract and get data from balanceOf for argument wallet_address<\/span>
raw_balance<\/span> =<\/span> contract<\/span>.functions<\/span>.balanceOf<\/span>(wallet_address<\/span>).call<\/span>()

# convert the value from Wei to Ether<\/span>
synthetix_value<\/span> =<\/span> Web3<\/span>.fromWei<\/span>(raw_balance<\/span>, 'ether'<\/span>)


<\/pre>\n
\u63a5\u4e0b\u6765\u6211\u4eec\u91c7\u53d6\u4e00\u7cfb\u5217\u6b65\u9aa4\uff0c\u8f93\u5165\u5730\u5740\u5e76\u8fd4\u56de\u6211\u4eec\u9009\u62e9\u7684\u94b1\u5305\u5730\u5740\u6240\u6301\u6709\u7684\u4ee3\u5e01\u6570\u91cf\u3002\u6211\u4eec\u7684\u6837\u672c\u5730\u5740\u662fSynthetix\uff08SNX\uff09\uff0c\u4f60\u53ef\u4ee5\u8f93\u5165\u4efb\u4f55\u4f60\u559c\u6b22\u7684\u5408\u7ea6\u5730\u5740\u3002\u4f60\u53ef\u4ee5\u60f3\u8c61\u4e00\u4e0b\uff0c\u4f60\u53ef\u4ee5\u5efa\u7acb\u4e00\u4e2aERC-20\u5408\u7ea6\u5730\u5740\u7684\u4e3b\u5217\u8868\uff0c\u5e76\u901a\u8fc7\u8fed\u4ee3\u6765\u627e\u5230\u7279\u5b9a\u94b1\u5305\u6240\u6301\u6709\u7684\u4ee3\u5e01\u3002\u6211\u4eec\u4f7f\u7528Web3\u51fd\u6570 <\/span>\u200b\u200btoChecksumAddress()<\/span>\u200b<\/code>\u200b\u6765\u786e\u4fdd\u6211\u4eec\u7684\u5730\u5740\u662f\u6821\u9a8c\u683c\u5f0f\u7684\u3002\u6211\u4eec\u4f7f\u7528 <\/span>\u200b\u200bfromWei()<\/span>\u200b<\/code>\u200b\u5c06\u6211\u4eec\u7684Wei\u4ef7\u683c\u8f6c\u6362\u4e3a ether\u30021ETH\u662f1E18 Wei\u3002\u6700\u540e\uff0c\u6211\u4eec\u5c06\u4f7f\u7528The Graph\u6765\u83b7\u53d6\u4e00\u4e9b\u884c\u60c5\u6570\u636e\u3002\u7531\u4e8e\u6211\u4eec\u5e0c\u671b\u6240\u6709\u7684\u4e1c\u897f\u90fd\u5728\u94fe\u4e0a\uff0c\u6240\u4ee5\u6211\u4eec\u9700\u8981\u5f97\u5230\u6211\u4eec\u60f3\u8981\u7684\u4ee3\u5e01\u5728DAI\u4e2d\u7684\u4ef7\u503c\uff0c\u8fd9\u662f\u4e00\u4e2a\u4e0e\u7f8e\u5143\u76f8\u5bf9\u6302\u94a9\u7684\u7a33\u5b9a\u5e01\u3002<\/span><\/p>\n
from<\/span> gql<\/span> import<\/span> gql<\/span>, Client<\/span>
from<\/span> gql<\/span>.transport<\/span>.requests<\/span> importRequestsHTTPTransport<\/span>
sample_transport<\/span>=<\/span>RequestsHTTPTransport<\/span>(
   url<\/span>=<\/span>'https:\/\/api.thegraph.com\/subgraphs\/name\/uniswap\/uniswap-v2'<\/span>,
   verify<\/span>=<\/span>True<\/span>,
   retries<\/span>=<\/span>5<\/span>,
)
client<\/span> =<\/span> Client<\/span>(
   transport<\/span>=<\/span>sample_transport<\/span>
)

# Get the value of SNX\/ETH<\/span>
query<\/span> =<\/span> gql<\/span>('''<\/span>
query {<\/span>
 pair(id: \"0x43ae24960e5534731fc831386c07755a2dc33d47\"){<\/span>
     reserve0<\/span>
     reserve1<\/span>
}<\/span>
}<\/span>
'''<\/span>)
response<\/span> =<\/span> client<\/span>.execute<\/span>(query<\/span>)
snx_eth_pair<\/span> =<\/span> response<\/span>['pair'<\/span>]
eth_value<\/span> =<\/span> float<\/span>(snx_eth_pair<\/span>['reserve1'<\/span>]) \/<\/span> float<\/span>(snx_eth_pair<\/span>['reserve0'<\/span>])

# Get the value of ETH\/DAI<\/span>
query<\/span> =<\/span> gql<\/span>('''<\/span>
query {<\/span>
 pair(id: \"0xa478c2975ab1ea89e8196811f51a7b7ade33eb11\"){<\/span>
     reserve0<\/span>
     reserve1<\/span>
}<\/span>
}<\/span>
'''<\/span>)
response<\/span> =<\/span> client<\/span>.execute<\/span>(query<\/span>)
eth_dai_pair<\/span> =<\/span> response<\/span>['pair'<\/span>]
dai_value<\/span> =<\/span> float<\/span>(eth_dai_pair<\/span>['reserve0'<\/span>]) \/<\/span> float<\/span>(eth_dai_pair<\/span>['reserve1'<\/span>])

snx_dai_value<\/span> =<\/span> eth_value<\/span> *<\/span> dai_value<\/span>


<\/pre>\n
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