CODEWITHSUNDEEP
pythonbinarytuples
To the moon
To the moon

Reputation: 31

How can i convert binary to number?

i made a function like this

def integer(n):
    num = int(''.join(n))
    base = 2
    answer = int(num,base)
    return answer

and i want to put (1, 1, 0, 0, 1, 0, 0, 0) and answer will be 200

but i got error like this

TypeError                                 Traceback (most recent call last)
<ipython-input-70-1c8f3fd15837> in <module>
      5     return answer
      6 
----> 7 integer((1, 1, 0, 0, 1, 0, 0, 0))

<ipython-input-70-1c8f3fd15837> in integer(n)
      1 def integer(n):
----> 2     num = int(''.join(n))
      3     base = 2
      4     answer = int(num,base)
      5     return answer

TypeError: sequence item 0: expected str instance, int found

what is wrong with my code?

Upvotes: 2

Views: 248

Answers (2)

jvieira88
jvieira88

Reputation: 125

As @deceze mentioned, the join method is only used for strings. If you are passing an array of ints, where each index represents one bit, you can use this:

def integerFromBitArray(arrBits):
    iResult = 0
    for bit in arrBits:
        iResult = (iResult << 1) | bit
    return iResult

Upvotes: 1

emartinelli
emartinelli

Reputation: 1047

You need a sequence of string to use join and you can't convert a non-string to int with an explicit base.

>>> def integer(n):
...     num = ''.join(str(i) for i in n)
...     base = 2
...     answer = int(num, base)
...     return answer
... 
>>> integer((1, 1, 0, 0, 1, 0, 0, 0))
200

Upvotes: 1

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