python2 lambda内赋值打印方法
python2 lambda内赋值打印方法
python2嘅lambda表达式好有用,但系喺python2入面却神奇咁唔可以print,唔可以raise,唔可以赋值(呢个仲可以理解)。以下基于python2.73@ubuntu default对lambda表达式周边产品进行改进,卖个好价钱:)。
python2当中,可以用exec,但呢个比较丑,所以都系定义几个函数,use it.
[python] #! ...
def raise_(ex):
raise ex
def print_(*l):
for i in l:
print i,
def defval(var,val):
globals()[var] = val
return val
(lambda : defval('a',3) and a == 3 and type(a) or 2)()
(lambda : defval('a',2) and a == 3 and type(a) or 2)()
(lambda x: print_(x))('world')
(lambda: raise_(Exception('hi')))()
#! ...
def raise_(ex):
raise ex
def print_(*l):
for i in l:
print i,
def defval(var,val):
globals()[var] = val
return val
(lambda : defval('a',3) and a == 3 and type(a) or 2)()
(lambda : defval('a',2) and a == 3 and type(a) or 2)()
(lambda x: print_(x))('world')
(lambda: raise_(Exception('hi')))()
一般情况下唔提倡咁做... 但有时候真系方便好多,而且lambda瞬间超神,高富帅=.=。
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