[Tutor] No module named uno in virtual environment
Mint 18.1 System python3 3.5.2 Python3-uno is available to the system python3. How can I make it available to python 3.6.5 in a virtual environment I installed using venv? (env36) jfb@jims-mint18 ~ $ python Python 3.6.5 (default, May 3 2018, 10:08:28) [GCC 5.4.0 20160609] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import oosheet Traceback (most recent call last): File "", line 1, in File "/home/jfb/EVs/env36/lib/python3.6/site-packages/oosheet/__init__.py", line 38, in import uno, re, zipfile, types, inspect, tempfile, shutil, subprocess ModuleNotFoundError: No module named 'uno' Thanks, Jim ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
[Tutor] Help with building bytearray arrays
Hello, I've been struggling with this for the last day or so and I can't seem to figure out how to make it work. I'll start out by saying that if there's a better approach, then I'm all ears. I'm using the Adafruit Breakout board for the FTDI FT232H part. Along with this comes the Python libraries and Adafruit libraries which I'm using. I don't think that the libraries are the real issue here, but I thought I should mention it just for the sake of information. Basically I'm trying to write a block of unsigned bytes to the device and read back an equal sized block of unsigned bytes. There's a function that is provided called transfer(data_to_send, num_of_bytes) that handles the heavy lifting. Unfortunately there seems to be a bug in the part and if I attempt to send the entire block of bytes (64), the device will lock up. I've been able to determine that if I send 16 bytes at a time, I'm okay. So, I take my bytearray(64) and step through it 16 bytes at a time like this: my function's main pieces are: def transfer_byte_array(): MAX_LOOP_COUNT = 64 slice_size = 16 read_ary = bytearray(MAX_LOOP_COUNT) scratch_ary = bytearray() for step in range (0, MAX_LOOP_COUNT, slice_size): scratch_ary = transfer(data_to_send, slice_size) for bytes in range (0, slice_size): read_ary = scratch_ary[bytes] return(read_ary) Ideally, I'd like to take the slice_size chunks that have been read and concatenate them back togetjer into a long MAX_LOOP_COUNT size array to pass back to the rest of my code. Eg: read_ary = ary_slice[0] + ary_slice[1] + ary_slice[2] + ary_slice[3] I know that the + version doesn't work (or didn't for me) but it is just my attempt at illustrating the overall goal. The problem that I repeatedly run into is with the line: read_ary = scratch_ary[bytes] (or variants thereof) The traceback is this: Traceback (most recent call last): File "SW8T_5.py", line 101, in loop_size = RSI_size_the_loop(Print) File "/home/temp/Python_Scratch/examples/RSI.py", line 350, in RSI_size_the_loop read_ary.append(scratch_ary[singles]) TypeError: an integer or string of size 1 is required or, one of the other common ones that I've seen is TypeError: can't concat bytearray to list This one is confusing because both of the operands are bytearry types.. or at least I thought they should be... when I try to replace the same line with : read_ary += scratch_ary[bytes] or read_ary.append(scratch[bytes]) or read_ary = read_ary + scratch_ary[bytes] I'm obviously missing something fundamental here. Problem is I can't seem to find any examples of people asking this question before on the inter-webs.. Thank you in advance to taking time to read. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
[Tutor] Additionally
Sorry admin, I don't know how to append a message I already sent:
the transfer function expects an input of a bytearray and returns the same:
def transfer(self, data):
"""Full-duplex SPI read and write. The specified array of bytes will be
clocked out the MOSI line, while simultaneously bytes will be read from
the MISO line. Read bytes will be returned as a bytearray object.
"""
# Build command to read and write SPI data.
command = 0x30 | (self.lsbfirst << 3) | (self.read_clock_ve <<
2) | self.write_clock_ve
logger.debug('SPI transfer with command {0:2X}.'.format(command))
# Compute length low and high bytes.
# NOTE: Must actually send length minus one because the MPSSE engine
# considers 0 a length of 1 and a length of 65536
length = len(data)
len_low = (length-1) & 0xFF
len_high = ((length-1) >> 8) & 0xFF
# Send command and length.
self._assert_cs()
self._ft232h._write(str(bytearray((command, len_low, len_high
self._ft232h._write(str(bytearray(data)))
self._ft232h._write('\x87')
self._deassert_cs()
# Read response bytes.
return bytearray(self._ft232h._poll_read(length))
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Re: [Tutor] Help with building bytearray arrays
On 07Sep2018 15:45, Chip Wachob wrote: Basically I'm trying to write a block of unsigned bytes to the device and read back an equal sized block of unsigned bytes. There's a function that is provided called transfer(data_to_send, num_of_bytes) that handles the heavy lifting. Unfortunately there seems to be a bug in the part and if I attempt to send the entire block of bytes (64), the device will lock up. I've been able to determine that if I send 16 bytes at a time, I'm okay. So, I take my bytearray(64) and step through it 16 bytes at a time like this: my function's main pieces are: def transfer_byte_array(): MAX_LOOP_COUNT = 64 slice_size = 16 read_ary = bytearray(MAX_LOOP_COUNT) scratch_ary = bytearray() for step in range (0, MAX_LOOP_COUNT, slice_size): scratch_ary = transfer(data_to_send, slice_size) for bytes in range (0, slice_size): read_ary = scratch_ary[bytes] return(read_ary) Ideally, I'd like to take the slice_size chunks that have been read and concatenate them back togetjer into a long MAX_LOOP_COUNT size array to pass back to the rest of my code. Eg: read_ary = ary_slice[0] + ary_slice[1] + ary_slice[2] + ary_slice[3] Minor remark: don't use the name "bytes" for a variable, it is a builtin type name and you're shadowing it. It looks to me like "transfer" hands you back a buffer with the read data, so this: scratch_ary = bytearray() don't do anything (it gets discarded). If you're getting back a bytes or bytearray object from transfer, just gather them all up in an list: returned_buffers = [] for .. response = transfer(data_to_send, slice_size) returned_buffers.append(response) ... read_ary = b''.join(returned_buffers) Note that that makes a new bytes object for read_ary to refer to. You don't need the earlier initialisation of read_ary. Also note that the bytes object is read only; if that is a problem you'll need to construct a bytearray instead. [...] The problem that I repeatedly run into is with the line: read_ary = scratch_ary[bytes] (or variants thereof) The traceback is this: Traceback (most recent call last): File "SW8T_5.py", line 101, in loop_size = RSI_size_the_loop(Print) File "/home/temp/Python_Scratch/examples/RSI.py", line 350, in RSI_size_the_loop read_ary.append(scratch_ary[singles]) TypeError: an integer or string of size 1 is required Yeah I thought that looked weird to me too. or, one of the other common ones that I've seen is TypeError: can't concat bytearray to list This one is confusing because both of the operands are bytearry types.. or at least I thought they should be... No, one will be a list :-) putting a bunch of: print(repr(foo)) replacing "foo" with relevant variables will be illuminating to you; you can see immediately where this are not what you expected. I'm obviously missing something fundamental here. Problem is I can't seem to find any examples of people asking this question before on the inter-webs.. You have the opposite of my problem. I can often find people asking the same question, but less often an answer. Or a decent answer, anyway. Cheers, Cameron Simpson ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Additionally
On Fri, Sep 07, 2018 at 03:54:04PM -0400, Chip Wachob wrote: > Sorry admin, I don't know how to append a message I already sent: The same way you append to a paper letter you've already posted... by sending a new letter, with enough context to understand what you're talking about. -- Steve ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
