main.py 文件源码

def __init__(self):
        if not is_pyethereum16_available():
            version = get_pyethereum_version()
            if version is None:
                raise pkg_resources.DistributionNotFound(
                    "The `ethereum` package is not available.  The "
                    "`PyEthereum16Backend` requires a 1.6.x version of the "
                    "ethereum package to be installed."
                )
            elif version not in Spec('>=1.6.0,<1.7.0'):
                raise pkg_resources.DistributionNotFound(
                    "The `PyEthereum16Backend` requires a 1.6.x version of the "
                    "`ethereum` package.  Found {0}".format(version)
                )
        self.reset_to_genesis()

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