对Python强大的可变参数传递机制详解

t=(arg1,...,argn)

f(arg1,...,argn)

str_t=(str(x) for x in t)
str_args=",".join(str_t)

eval('%s(%s)'%(f.__name__,str_args))

f(arg1,...,argn)

def imap(func,arr,*arrs):
 allarrs=(arr,)+arrs
 args=[]
 for i in range(len(arr)):
  member=[]
  for ar in allarrs:
   member.append(str(ar[i]))
  args.append(member)
 return (eval('%s(%s)'%(func.__name__,','.join(member))) for member in args)

print list(imap(float,(1,2,3,4)))
print list(imap((lambda x,y,z:x+y+z),(1,1,1,1),(1,1,1,1),(1,1,1,1)))

def imap(func,arr,*arrs):
 allarrs=(arr,)+arrs
 return (func(*(ar[i] for ar in allarrs)) for i in range(len(arr)))

print list(imap(float,(1,2,3,4)))
print list(imap((lambda x,y,z:x+y+z),(1,1,1,1),(1,1,1,1),(1,1,1,1)))

>>> 
[1.0, 2.0, 3.0, 4.0]
[3, 3, 3, 3]

>>> def function(*iterable):
 print iterable

 
>>> function(*(1,2,3))
(1, 2, 3)
>>> function(*[1,2,3])
(1, 2, 3)
>>> function(*{1:'',2:''})
(1, 2)
>>> function(*(i for i in range(4)))
(0, 1, 2, 3)
>>>