PEP 8种早于清单理解。我通常在逻辑位置将它们分解成多行：
memberdef_list = [elem for elem in from_cache(classname, 'memberdefs')
if elem.argsstring != '[]' and
'std::string' in null2string(elem.vartype)]
不过，大多数情况下，我首先会放弃涉及的测试：
def stdstring_args(elem):
if elem.argstring == '[]':
return False
return 'std::string' in null2string(elem.vartype)
memberdef_list = [elem for elem in from_cache(classname, 'memberdefs')
if stdstring_args(elem)]
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