[Tutor] String module; Count

[Ben Sherman]

You can only count one at a time.

count = conversion(n).count("0") + conversion(n).count("1")

count is a string method, so it operates directly on the string - you
don't have to call it like you did.

import string
string.count(mystr, "cheese")

is the same as

mystr.count("cheese")

At least it is in newer versions of python.

Let me know if that helped.

Cheers,
Ben

On 10/17/07, ddm2 at sfu.ca <ddm2 at sfu.ca> wrote:
> I am having trouble getting the string.count function to work. I want it to
> count the amount of digits (0 or 1) in the string, but I keep getting an
> error stating the string.count was expecting a character buffer object.
> CODE:
> count = string.count(conversion(n),["0","1"])
>
> ERROR:
> Traceback (most recent call last):
>   File "/Users/<name>/Desktop/Project 1.py", line 59, in -toplevel-
>     signed_mag()
>   File "/Users/<name>/Desktop/Project 1.py", line 29, in signed_mag
>     count = string.count(conversion(n),["0","1"])
>   File
> "/Library/Frameworks/Python.framework/Versions/2.4//lib/python2.4/string.py"
> , line 348, in count
>     return s.count(*args)
> TypeError: expected a character buffer object
>
> I'm trying to make a decimal to binary converter that has the option to
> select the amount of bits for Signed Binary. I've thought of a way (not
> tested yet) on how to implement the bits, but I first need to count the
> amount of digits in the original conversion. Thanks in advance.
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