def assertInBytecode(self, x, opname, argval=_UNSPECIFIED):
"""Returns instr if op is found, otherwise throws AssertionError"""
for instr in dis.get_instructions(x):
if instr.opname == opname:
if argval is _UNSPECIFIED or instr.argval == argval:
return instr
disassembly = self.get_disassembly_as_string(x)
if argval is _UNSPECIFIED:
msg = '%s not found in bytecode:\n%s' % (opname, disassembly)
else:
msg = '(%s,%r) not found in bytecode:\n%s'
msg = msg % (opname, argval, disassembly)
self.fail(msg)
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