Testing a Contract¶
The following example demonstrates how to compile and deploy your vyper contract.
pyethereum>=2.0.0 for the
Note: We are working on integration with ethereum-tester, so this example will change.
Testing Using vyper-run Command¶
To allow quickly testing contracts, Vyper provides a command line tool for instantly executing a function:
vyper-run yourFileName.vy "yourFunction();" -i some_init_param, another_init_param
The vyper-run command is composed of 4 parts:
- the name of the contract file you want to execute (for example: coolContract.vy)
- a string (wrapped in double quotes) with the function you want to trigger, you can trigger multiple functions by adding a semicolon at the end of each function and then call the next function (for example:
- (Optional) the parameters for the
__init__function of the contract (for example: given
__init__(a: int128, b: int128)the syntax would be
Putting it all together:
vyper-run myContract.vy "myFunction1();myFunction2()" -i 1,3
The vyper-run command will print out the returned value of the called functions as well as all the logged events emitted during the function’s execution.
Deploying a Contract¶
You have several options to deploy a Vyper contract to the public testnets.
One option is to take the bytecode generated by the vyper compiler and manually deploy it through mist or geth:
Or deploy it with current browser on myetherwallet contract menu.
We are working on integration with populus, this will be the preferred way of deploying vyper contracts in the future.