Created
December 16, 2013 14:24
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python 在處理 closure 時，編譯時期就會偵測是否有使用 closure ，有的話，則會特別產生一些給 closure 用的 opcode。下面例子，會產生一些給 closure 用的 opcode。如果你把 print value 改成其他名稱，則不會產生 closure 的 opcode。
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| def get_func(): | |
| value = 's' | |
| def test(): | |
| print value | |
| return test | |
| import dis | |
| dis.dis(get_func) |
get_func 的 value 叫做 co_cellvars
test的 value 叫做 co_freevars
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closure 相關的 opcode:
STORE_DEREF
LOAD_DEREF
LOAD_CLOSURE
MAKE_CLOSURE