GitHub 標(biāo)星 20K+:What the fuck Python?!

經(jīng)常逛GitHub的可能關(guān)注一個(gè)牛叉的項(xiàng)目，叫 What the f*ck Python!

這個(gè)項(xiàng)目列出了幾乎所有python中那些鮮為人知的功能特性，有些功能第一次遇見(jiàn)時(shí)，你會(huì)冒出 what the f**k 的感嘆。

因?yàn)檫@些例子看起來(lái)反人類(lèi)直覺(jué)。

但是如果你理解了它背后的真正原理，你又會(huì)驚嘆what the f**k， 竟然還有這么騷的操作。

來(lái)看看幾個(gè)例子吧。

微妙的字符串

>>> a = "wtf"
>>> b = "wtf"
>>> a is b
True

>>> a = "wtf!"
>>> b = "wtf!"
>>> a is b
False

>>> a, b = "wtf!", "wtf!"
>>> a is b
True # 3.7 版本返回結(jié)果為 False.

出乎意料的”is”

>>> a = 256
>>> b = 256
>>> a is b
True

>>> a = 257
>>> b = 257
>>> a is b
False

>>> a = 257; b = 257
>>> a is b
True

說(shuō)好的元組不可變呢

some_tuple = ("A", "tuple", "with", "values")
another_tuple = ([1, 2], [3, 4], [5, 6])

>>> some_tuple[2] = "change this"
TypeError: 'tuple' object does not support item assignment
>>> another_tuple[2].append(1000) # 這里不出現(xiàn)錯(cuò)誤
>>> another_tuple
([1, 2], [3, 4], [5, 6, 1000])
>>> another_tuple[2] += [99, 999]
TypeError: 'tuple' object does not support item assignment
>>> another_tuple
([1, 2], [3, 4], [5, 6, 1000, 99, 999])

消失的全局變量

e = 7
try:
raise Exception()
except Exception as e:
pass

輸出

>>> print(e)
NameError: name 'e' is not defined

try 遇到 finally到底返回哪個(gè)值

def some_func():
try:
return 'from_try'
finally:
return 'from_finally'

輸出

>>> some_func()
'from_finally'

諸如此類(lèi)的例子一共有50多個(gè),

如果你能把這50多個(gè)特性背后的原理機(jī)制全部了解清楚，我相信你的python功力一定會(huì)上升一個(gè)層次。

傳送門(mén): https://github.com/leisurelicht/wtfpython-cn

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