prm 最近的时间轴更新 prm 最近的时间轴更新prm's repos on GitHub
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cachex
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caddy-filemanager
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calecto
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castore
Up-to-date certificate store for Elixir. 🔐
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codepagex
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ColorHelper
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crates.io
Source code for crates.io
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csv
CSV Decoding and Encoding for Elixir
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curio
 |
prmV2EX 第 177065 号会员，加入于 2016-06-12 18:36:10 +08:00 |
PrMaple
princemaple
prm 最近回复了
2016-07-25 23:08:01 +08:00 回复了 strahe 创建的主题 › Python › 关于 Python 的一个问题 |
归根结底这是 Python 语言设计的锅， python 定义了与各种 operator 等价的 magic method (双下划线 method ，比如__iadd__是+=，当然，也就是后来编译出来的 INPLACE_ADD)，当你从语法上玩弄语义的时候（+=, []= 合并成了 x[y]+=z ），就被自己玩了。。
2016-07-25 23:03:36 +08:00 回复了 strahe 创建的主题 › Python › 关于 Python 的一个问题 |
并不是一个 Bug ，来看一下 byte code
$ py -3
Python 3.5.1 (v3.5.1:37a07cee5969, Dec 6 2015, 01:54:25) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from dis import dis
>>> dis('''
... a = (1, [1,2,3], 'a')
... a[1] += [4]
... ''')
2 0 LOAD_CONST 0 (1)
3 LOAD_CONST 0 (1)
6 LOAD_CONST 1 (2)
9 LOAD_CONST 2 (3)
12 BUILD_LIST 3
15 LOAD_CONST 3 ('a')
18 BUILD_TUPLE 3
21 STORE_NAME 0 (a)
3 24 LOAD_NAME 0 (a)
27 LOAD_CONST 0 (1)
30 DUP_TOP_TWO
31 BINARY_SUBSCR
32 LOAD_CONST 4 (4)
35 BUILD_LIST 1
38 INPLACE_ADD
39 ROT_THREE
40 STORE_SUBSCR
41 LOAD_CONST 5 (None)
44 RETURN_VALUE
a[1] += [4]实际是两部操作，+= 和 []=
INPLACE_ADD 是 +=
STORE_SUBSCR 是 []=
先发生了+=，然后 []= 报错了。仅此而已。
$ py -3
Python 3.5.1 (v3.5.1:37a07cee5969, Dec 6 2015, 01:54:25) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from dis import dis
>>> dis('''
... a = (1, [1,2,3], 'a')
... a[1] += [4]
... ''')
2 0 LOAD_CONST 0 (1)
3 LOAD_CONST 0 (1)
6 LOAD_CONST 1 (2)
9 LOAD_CONST 2 (3)
12 BUILD_LIST 3
15 LOAD_CONST 3 ('a')
18 BUILD_TUPLE 3
21 STORE_NAME 0 (a)
3 24 LOAD_NAME 0 (a)
27 LOAD_CONST 0 (1)
30 DUP_TOP_TWO
31 BINARY_SUBSCR
32 LOAD_CONST 4 (4)
35 BUILD_LIST 1
38 INPLACE_ADD
39 ROT_THREE
40 STORE_SUBSCR
41 LOAD_CONST 5 (None)
44 RETURN_VALUE
a[1] += [4]实际是两部操作，+= 和 []=
INPLACE_ADD 是 +=
STORE_SUBSCR 是 []=
先发生了+=，然后 []= 报错了。仅此而已。
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