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up vote 1 down vote favorite

I was wondering if there is a way in Python to convert an array or a list into one single number:

A=[0xaa,0xbb,0xcc]

d=0xaabbcc

Thanks for your help!

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3 Answers 3

up vote 2 down vote

Use hex(), map(), and join().

>>> '0x' + ''.join(map(hex, A)).replace('0x', '')
'0xaabbcc'

Or with lambda:

>>> '0x' + ''.join(map(lambda x: hex(x)[2:], A))
'0xaabbcc'
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1  
What if some elements of A are < 0x10? –  John La Rooy 8 mins ago
up vote 2 down vote

For Python3+, int has a method for this

>>> A=[0xaa,0xbb,0xcc]
>>> hex(int.from_bytes(A, byteorder="big"))
'0xaabbcc'

>>> 0xaabbcc == int.from_bytes(A, byteorder="big")
True
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up vote 1 down vote 
A = [0xaa, 0xbb, 0xcc]
d = reduce(lambda x, y: x*256 + y, A)
print hex(d)
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I suggest you to use x << y.bit_length() instead of x*256 to make your code more flexible –  Alik 16 mins ago
2  
@Alik You are right, but only if the original question wants to deal with bits instead of bytes. Please note that for a = 1 the a.bit_length() gives 1. –  dlask 13 mins ago
1  
Oh, I didn't think about the question this way. I think OP should clarify what he wants to do. –  Alik 10 mins ago

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