从列表类型转化为纯数字

Question

将列表类型转化为数字

a = [12345]

转化为 b = 12345

Answer 1

>>> a=[1,2,3,4,5,]
>>> k=0
>>> for i in range(len(a)):
...     k =k+a[i]*(10**(len(a)-i-1))
... 
>>> k
12345
>>>