On 10Sep2018 10:23, Chip Wachob <wach...@gmail.com> wrote:
So, without all the fluff associated with wiggling lines, my function
now looks like this:
def RSI_size_the_loop():
results = []
all_together = [] # not certain if I need this, put it in in an
attempt to fix the incompatibility if it existed
You don't need this. all_together doesn't need to be mentioned until you
initiate it with your bytearray.join.
for x in range (0, MAX_LOOP_COUNT, slice_size):
results.append(my_transfer(disp, data_out, slice_size)
print " results ", x, " = ", results # show how results grows
on each iteration
all_together = bytearray().join(results)
print " all together ", all_together
I can observe results increasing in size and the last time through the loop:
results 48 =
[[bytearray(b'\xff\xff\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')],
[bytearray(b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')],
[bytearray(b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')],
[bytearray(b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')]]
Peter has pointed out that you have a list of list-of-bytearray instead of a
flat list-of-bytearray.
The inference here is that your my_transfer function is returning a single
element list-of-bytearray.
So, now when I hit the line:
all_together = bytearray().join(results)
I'm getting the Traceback :
[...]
Traceback (most recent call last):
File "SW8T_5.py", line 101, in <module> # this is my main script
loop_size = RSI_size_the_loop(Print)
File "/home/temp/Python_Scratch/examples/RSI.py", line 359, in
RSI_size_the_loop
all_together = bytearray().join(results)
TypeError: can only join an iterable of bytes (item 0 has type 'list')
So because you have a list-of-list, item[0] is indeed a list, not a bytearray.
If you change this:
results.append(my_transfer(disp, data_out, slice_size)
into:
result = my_transfer(disp, data_out, slice_size)
print("result =", repr(result))
results.append(result)
this should be apparent. So this issue lies with your my_transfer function; the
main loop above now looks correct.
I've even added in print statements for the types, so I could double
check, and I get:
results returns <type 'list'>
all_together returns <type 'list'>
So both are type 'list' which is referred to here :
https://infohost.nmt.edu/tcc/help/pubs/python/web/sequence-types.html
as a valid sequence type but apparently there's a detail I'm still missing...
Yeah. bytearray().join wants bytes or bytearrays in the list/iterable you hand
it. You've got lists, with the bytearrays further in.
Cheers,
Cameron Simpson <c...@cskk.id.au>
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