trouble formatting serial data from python enumeration

Question

So I get a list of mentions from twitter, and need to know the index of each mention. To do this I use:

for idx, result in enumerate(mentions, start = 48):
message = result['text']
print idx, message

which returns

48 " first message"

as expected. However, I need to use this index for some serial data that requires me to convert the index into hex. So.. I use:

hidx = hex(idx)

which then returns 0x30. However I need to somehow have this result in the exact format of "\x30" so that I can use serial to write:

serial.write("\x30")

what is the best way to accomplish this? If I keep my hex-converted index code the way it is, I get that pesky extra 0 and no backslash that causes the serial code to actually write serial.write(0x30), which is not what I need. Im hoping to find a way that, because of the for loop, I will receive:

serial.write("\x30")
serial.write("\x31")
serial.write("\x32")

ect. for as many mentions as I need. Is there a way to strip the first zero and add the \? Maybe a better way? Im new to python and serial communication so any help will be much appreciated.

Alex Martelli · Accepted Answer · 2015-01-14 02:44:22Z

1

(Assuming Python 2) "\x30" is a 1-byte string and the byte in question is the one at ASCII code 48:

>>> print repr('\x30')
'0'

So, all you need to do to emit it is serial.write(chr(idx)) -- no need to mess with hex!

answered Jan 14, 2015 at 2:44

Alex Martelli

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