Nope - 6 months ago 10
Python Question

# Python: Convert list of ints to one number?

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'>
``````

What is the best way to implement the magic function?

Thanks for your help.

EDIT

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

EDIT 2

Let's give some credit to Triptych and cdleary for their great answers! Thanks guys.

``````# 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)
``````
Source (Stackoverflow)