将整数列表转换为一个数字?

问题描述：

我有一个整数列表，我想将其转换为一个数字，例如:

I have a list of integers that I would like to convert to one number like:

numList = [1, 2, 3]
num = magic(numList)

print num, type(num)
>>> 123, <type 'int'>

实现magic 功能的最佳方法是什么?

What is the best way to implement the magic function?

编辑
我确实找到了 this，但似乎必须有更好的方法.

EDIT
I did find this, but it seems like there has to be a better way.

答

# Over-explaining a bit:
def magic(numList):         # [1,2,3]
    s = map(str, numList)   # ['1','2','3']
    s = ''.join(s)          # '123'
    s = int(s)              # 123
    return s


# How I'd probably write it:
def magic(numList):
    s = ''.join(map(str, numList))
    return int(s)


# As a one-liner  
num = int(''.join(map(str,numList)))


# Functionally:
s = reduce(lambda x,y: x+str(y), numList, '')
num = int(s)


# Using some oft-forgotten built-ins:
s = filter(str.isdigit, repr(numList))
num = int(s)

将整数列表转换为一个数字?

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