I was just trying SSL-Sockets in Micropython and discovered that I can not set the connection to non-blocking as the setblocking() function is not implemented, yet.
>>> import ussl
>>> import usocket
>>> s = usocket.socket()
>>> adr = usocket.getaddrinfo('myserverwithssl.com', 443)[0][-1]
>>> s.connect(adr)
>>> s_ssl = ussl.wrap_socket(adr)
>>> s_ssl.setblocking(False)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NotImplementedError:
Looking forward to the implementation. However, is there another way to achieve nonblocking SSL-Sockets in Micropython?
Related
import machine, utime
from machine import I2C
i2c = machine.I2C(0, scl=machine.Pin(1), sda=machine.Pin(0), freq=400000)
devices = i2c.scan()
if len(devices) == 0:
print("No I2C device found")
elif len(devices) > 1:
print("Multiple I2C devices found -")
for d in devices:
print(" 0x{:02X}".format(d))
else:
print("I2C device found at 0x{:02X}".format(devices[0]))
device = devices[0]
i2c.writeto(device, b'x3')
i2c.writeto(device, 2, b'x80')
>>> %Run -c $EDITOR_CONTENT
I2C device found at 0x27
Traceback (most recent call last):
File "<stdin>", line 16, in <module>
OSError: [Errno 5] EIO
I'm trying to use a cairo.TeeSurface (pycairo version '1.21.0') to redirect input to multiple surfaces, but I cannot make it work, here is my code:
>>> import cairo
>>> s1 = cairo.ImageSurface(cairo.FORMAT_ARGB32, 500,500)
>>> s2 = cairo.ImageSurface(cairo.FORMAT_ARGB32, 500,500)
>>> s3 = cairo.ImageSurface(cairo.FORMAT_ARGB32, 500,500)
>>> s = cairo.TeeSurface(s1)
>>> s.add(s2)
>>> s.add(s3)
>>> c = cairo.Context(s)
After above iniziatilation if I try to draw a line I get an error:
>>> c.rel_line_to(100,100)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
cairo.Error: no current point defined
I tried to set explicitly a point but I get the same error:
>>> c.move_to(10,10)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
cairo.Error: no current point defined
For sure I must have misunderstood something, any clue would be appreciated.
Following the examples on https://networkx.github.io/documentation/stable/reference/drawing.html, I tried the following code:
import networkx as nx
G = nx.complete_graph(5)
A = nx.nx_agraph.to_agraph(G)
H = nx.nx_agraph.from_agraph(A)
I get a RuntimeError as follows:
H = nx.nx_agraph.from_agraph(A)
Traceback (most recent call last):
File "/home/nom/anaconda3/envs/wcats/lib/python3.7/site-packages/pygraphviz/agraph.py", line 1750, in iteritems
ah = gv.agnxtattr(self.handle, self.type, ah)
StopIteration: agnxtattr
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "<ipython-input-10-19c378da806e>", line 1, in <module>
H = nx.nx_agraph.from_agraph(A)
File "/home/nom/anaconda3/envs/wcats/lib/python3.7/site-packages/networkx/drawing/nx_agraph.py", line 85, in from_agraph
N.graph.update(A.graph_attr)
File "/home/nom/anaconda3/envs/wcats/lib/python3.7/site-packages/pygraphviz/agraph.py", line 1740, in keys
return list(self.__iter__())
File "/home/nom/anaconda3/envs/wcats/lib/python3.7/site-packages/pygraphviz/agraph.py", line 1743, in __iter__
for (k, v) in self.iteritems():
RuntimeError: generator raised StopIteration
This error is so basic that I suspect there's a problem with the package itself. Any suggestions on how I can try to troubleshoot this one?
Hello I am trying to use typed List in numba v46.0
>>> from numba.typed import List
>>> from numba import types
>>> mylist = List.empty_list(item_type=types.Tuple((types.f8, types.f8)))
>>> mylist2 = List.empty_list(item_type=types.List(dtype=types.Tuple((types.f8, types.f8))))
>>> mylist2.append(mylist)
but I got the following error, I am wondering how to fix it?
Traceback (most recent call last): File "", line 1, in
File
"/usr/local/lib/python3.7/site-packages/numba/typed/typedlist.py",
line 223, in append
_append(self, item) File "/usr/local/lib/python3.7/site-packages/numba/dispatcher.py", line
401, in _compile_for_args
error_rewrite(e, 'typing') File "/usr/local/lib/python3.7/site-packages/numba/dispatcher.py", line
344, in error_rewrite
reraise(type(e), e, None) File "/usr/local/lib/python3.7/site-packages/numba/six.py", line 668, in
reraise
raise value.with_traceback(tb) numba.errors.TypingError: Failed in nopython mode pipeline (step: nopython frontend) Internal error at
. Failed in
nopython mode pipeline (step: nopython mode backend) Cannot cast
ListType[tuple(float64 x 2)] to list(tuple(float64 x 2)): %".24" =
load {i8*, i8*}, {i8*, i8*}* %"item"
File
"../../usr/local/lib/python3.7/site-packages/numba/listobject.py",
line 434:
def impl(l, item):
casteditem = _cast(item, itemty)
the following should work
mylist2 = List.empty_list(item_type=types.ListType(itemty=types.Tuple((types.f8, types.f8))))
I would like to know the right way to read float fields using Quickfix (python). I was getting a string then casting to float.
For instance:
>>> m = fix.Message()
>>> m.setField(fix.BidPx(1.12))
>>> m.getField(fix.BidPx()).getString()
'1.12'
>>> float(m.getField(fix.BidPx()).getString())
1.12
The way above works fine for floats with less then 15 digits of precision. But I got the following error for float numbers with more the 15 digits of precision:
>>> m = fix.Message()
>>> m.setField(fix.BidPx(1.123456789123456))
>>> m.getField(fix.BidPx()).getString()
'\x00\xe1}\xf5\x82U\x00\x0078912346'
>>> float(m.getField(fix.BidPx()).getString())
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: could not convert string to float:
I am not sure if that sample works, may be you should explain how you import "fix".
Any way, this sample works with python 3.7 and quickfix 1.15.1
>>> import quickfix as fix
>>> m = fix.Message()
>>> m.setField(fix.BidPx(1.123456789123456789123456789))
>>> m.getField(fix.BidPx().getField())
'1.12345678912346'
>>>
if you need more precision in the float number, you can do
>>> m.setField(fix.StringField(fix.BidPx().getField(),"1.123456789123456789123456789"))
>>> m.getField(fix.BidPx().getField())
'1.123456789123456789123456789'
>>>
I hope I've helped