[Python.NET] Re: Python to c# long conversion time
LOST _ <[email protected]> Mon, 27 Jun 2022 09:51:58 -0700
| Newsgroups | gmane.comp.python.dotnet |
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--></style></head><body lang=3DEN-US link=3Dblue vlink=3D"#954F72" style=3D=
'word-wrap:break-word'><div class=3DWordSection1><p class=3DMsoNormal>Pleas=
e, use myPyByteArray.GetBuffer() and the PyBuffer.Read method to copy from =
a NumPy array.</p><p class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoN=
ormal>I created <a href=3D"https://github.com/pythonnet/pythonnet/issues/18=
38">a feature request</a> to make the default conversion mechanism take adv=
antage of PyBuffer some time in the future.</p><p class=3DMsoNormal><o:p>&n=
bsp;</o:p></p><p class=3DMsoNormal>Regards,</p><p class=3DMsoNormal>Victor<=
/p><p class=3DMsoNormal><o:p> </o:p></p><div style=3D'mso-element:para=
-border-div;border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0i=
n 0in'><p class=3DMsoNormal style=3D'border:none;padding:0in'><b>From: </b>=
<a href=3D"mailto:[email protected]">Jordan GUILLOT</a><br><b>Sent:=
</b>Monday, June 27, 2022 8:19 AM<br><b>To: </b><a href=3D"mailto:pythonne=
[email protected]">[email protected]</a><br><b>Subject: </b>[Python.NET] [Pyt=
honnet] Python to c# long conversion time</p></div><p class=3DMsoNormal><o:=
p> </o:p></p><p class=3DMsoNormal><span lang=3DEN-GB>Hi,</span><span l=
ang=3DFR><o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-GB>&nbs=
p;</span><span lang=3DFR><o:p></o:p></span></p><p class=3DMsoNormal><span l=
ang=3DEN-GB>I=E2=80=99m using Pythonnet to import proprietary python packag=
e from Windows Application.</span><span lang=3DFR><o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-GB>When my python package return a large =
byte array in C# world, the type conversion takes lot of time.</span><span =
lang=3DFR><o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-GB>&nb=
sp;</span><span lang=3DFR><o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-GB>To illustrate this long conversion time, I made a simple examp=
le:</span><span lang=3DFR><o:p></o:p></span></p><ol style=3D'margin-top:0in=
' start=3D1 type=3D1><li class=3DMsoListParagraph style=3D'margin-left:0in;=
mso-list:l0 level1 lfo1'><span lang=3DEN-GB>A Python package with a method =
which return a byte array:</span><span lang=3DFR><o:p></o:p></span></li></o=
l><p class=3DMsoNormal style=3D'text-indent:35.4pt'><span lang=3DEN-GB>clas=
s MyClass:</span><span lang=3DFR><o:p></o:p></span></p><p class=3DMsoNormal=
><span lang=3DEN-GB> =
&nb=
sp; @staticmethod</span><span lang=3DFR><o:p>=
</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-GB> =
&n=
bsp; def =
get_bytes_from_py():</span><span lang=3DFR><o:p></o:p></span></p><p class=
=3DMsoNormal><span lang=3DEN-GB> =
&nb=
sp; =
array =3D np.a=
range(0, 720000, dtype=3Dnp.uint8)</span><span lang=3DFR><o:p></o:p></span>=
</p><p class=3DMsoNormal><span lang=3DEN-GB> &=
nbsp; &nb=
sp; =
re=
turn bytes(array)</span><span lang=3DFR><o:p></o:p></span></p><p class=3DMs=
oNormal><span lang=3DEN-GB> </span><span lang=3DFR><o:p></o:p></span><=
/p><ol style=3D'margin-top:0in' start=3D2 type=3D1><li class=3DMsoListParag=
raph style=3D'margin-left:0in;mso-list:l0 level1 lfo1'><span lang=3DEN-GB>A=
n application console to call my Python package and which convert =E2=80=98=
bytes=E2=80=99 type into =E2=80=98byte[]=E2=80=99 type</span><span lang=3DF=
R><o:p></o:p></span></li></ol><p class=3DMsoNormal><span lang=3DEN-GB> =
;</span><span lang=3DFR><o:p></o:p></span></p><p class=3DMsoNormal style=3D=
'text-autospace:none'><span lang=3DEN-GB style=3D'font-size:9.5pt;font-fami=
ly:Consolas;color:black'> </span>=
<span lang=3DEN-GB style=3D'font-size:9.5pt;font-family:Consolas;color:blue=
'>static</span><span lang=3DEN-GB style=3D'font-size:9.5pt;font-family:Cons=
olas;color:black'> </span><span lang=3DEN-GB style=3D'font-size:9.5pt;font-=
family:Consolas;color:blue'>void</span><span lang=3DEN-GB style=3D'font-siz=
e:9.5pt;font-family:Consolas;color:black'> Main(</span><span lang=3DEN-GB s=
tyle=3D'font-size:9.5pt;font-family:Consolas;color:blue'>string</span><span=
lang=3DEN-GB style=3D'font-size:9.5pt;font-family:Consolas;color:black'>[]=
args)</span><span lang=3DFR><o:p></o:p></span></p><p class=3DMsoNormal sty=
le=3D'text-autospace:none'><span lang=3DEN-GB style=3D'font-size:9.5pt;font=
-family:Consolas;color:black'> {<=
/span><span lang=3DFR><o:p></o:p></span></p><p class=3DMsoNormal style=3D't=
ext-autospace:none'><span lang=3DEN-GB style=3D'font-size:9.5pt;font-family=
:Consolas;color:black'> &nbs=
p; Runtime.PythonDLL =3D </span><span lang=3DEN-GB style=3D'fon=
t-size:9.5pt;font-family:Consolas;color:#A31515'>"c:\\Python38\\python=
38.dll"</span><span lang=3DEN-GB style=3D'font-size:9.5pt;font-family:=
Consolas;color:black'>;</span><span lang=3DFR><o:p></o:p></span></p><p clas=
s=3DMsoNormal style=3D'text-autospace:none'><span lang=3DEN-GB style=3D'fon=
t-size:9.5pt;font-family:Consolas;color:black'> &nbs=
p; PythonEngine.Initialize();</span><sp=
an lang=3DFR><o:p></o:p></span></p><p class=3DMsoNormal style=3D'text-autos=
pace:none'><span lang=3DEN-GB style=3D'font-size:9.5pt;font-family:Consolas=
;color:black'> &=
nbsp; </span><span lang=3DFR><o:p></o:p></span></p><p class=3DMsoNormal sty=
le=3D'text-autospace:none'><span lang=3DEN-GB style=3D'font-size:9.5pt;font=
-family:Consolas;color:black'> &nb=
sp; Stopwatch st =3D </span><span lang=3DEN-GB style=
=3D'font-size:9.5pt;font-family:Consolas;color:blue'>new</span><span lang=
=3DEN-GB style=3D'font-size:9.5pt;font-family:Consolas;color:black'> Stopwa=
tch();</span><span lang=3DFR><o:p></o:p></span></p><p class=3DMsoNormal sty=
le=3D'text-autospace:none'><span lang=3DEN-GB style=3D'font-size:9.5pt;font=
-family:Consolas;color:black'> &nb=
sp; st.Start();</span><span lang=3DFR><o:p></o:p></span><=
/p><p class=3DMsoNormal style=3D'text-autospace:none'><span lang=3DEN-GB st=
yle=3D'font-size:9.5pt;font-family:Consolas;color:black'> </span><span=
lang=3DFR><o:p></o:p></span></p><p class=3DMsoNormal style=3D'text-autospa=
ce:none'><span lang=3DEN-GB style=3D'font-size:9.5pt;font-family:Consolas;c=
olor:black'> &nb=
sp; </span><span lang=3DEN-GB style=3D'font-size:9.5pt;font-family:Consolas=
;color:blue'>using</span><span lang=3DEN-GB style=3D'font-size:9.5pt;font-f=
amily:Consolas;color:black'> (Py.GIL())</span><span lang=3DFR><o:p></o:p></=
span></p><p class=3DMsoNormal style=3D'text-autospace:none'><span lang=3DEN=
-GB style=3D'font-size:9.5pt;font-family:Consolas;color:black'> =
{</span><span lang=
=3DFR><o:p></o:p></span></p><p class=3DMsoNormal style=3D'text-autospace:no=
ne'><span lang=3DEN-GB style=3D'font-size:9.5pt;font-family:Consolas;color:=
black'> &n=
bsp; dynamic myPackage =3D Py.Import(</span><span lang=3D=
EN-GB style=3D'font-size:9.5pt;font-family:Consolas;color:#A31515'>"my=
package"</span><span lang=3DEN-GB style=3D'font-size:9.5pt;font-family=
:Consolas;color:black'>);</span><span lang=3DFR><o:p></o:p></span></p><p cl=
ass=3DMsoNormal style=3D'text-autospace:none'><span lang=3DEN-GB style=3D'f=
ont-size:9.5pt;font-family:Consolas;color:black'> &n=
bsp; dynamic my=
Class =3D myPackage.MyClass();</span><span lang=3DFR><o:p></o:p></span></p>=
<p class=3DMsoNormal style=3D'text-autospace:none'><span lang=3DEN-GB style=
=3D'font-size:9.5pt;font-family:Consolas;color:black'> &nb=
sp; dynam=
ic myPyByteArray =3D myClass.get_bytes_from_py();</span><span lang=3DFR><o:=
p></o:p></span></p><p class=3DMsoNormal style=3D'text-autospace:none'><span=
lang=3DEN-GB style=3D'font-size:9.5pt;font-family:Consolas;color:black'>&n=
bsp;</span><span lang=3DFR><o:p></o:p></span></p><p class=3DMsoNormal style=
=3D'text-autospace:none'><span lang=3DEN-GB style=3D'font-size:9.5pt;font-f=
amily:Consolas;color:black'>  =
; </span><span lang=3DEN-GB style=
=3D'font-size:9.5pt;font-family:Consolas;color:blue'>long</span><span lang=
=3DEN-GB style=3D'font-size:9.5pt;font-family:Consolas;color:black'> t0 =3D=
st.ElapsedMilliseconds;</span><span lang=3DFR><o:p></o:p></span></p><p cla=
ss=3DMsoNormal style=3D'text-autospace:none'><span lang=3DEN-GB style=3D'fo=
nt-size:9.5pt;font-family:Consolas;color:black'> &nb=
sp; </span><spa=
n lang=3DEN-GB style=3D'font-size:9.5pt;font-family:Consolas;color:blue'>by=
te</span><span lang=3DEN-GB style=3D'font-size:9.5pt;font-family:Consolas;c=
olor:black'>[] myCsharpByteArray =3D myPyByteArray;</span><span lang=3DFR><=
o:p></o:p></span></p><p class=3DMsoNormal style=3D'text-autospace:none'><sp=
an lang=3DEN-GB style=3D'font-size:9.5pt;font-family:Consolas;color:black'>=
&nb=
sp; </span><span lang=3DFR style=3D'font-size:9.5pt;font-family=
:Consolas;color:blue'>long</span><span lang=3DFR style=3D'font-size:9.5pt;f=
ont-family:Consolas;color:black'> t1 =3D st.ElapsedMilliseconds;</span><spa=
n lang=3DFR><o:p></o:p></span></p><p class=3DMsoNormal style=3D'text-autosp=
ace:none'><span lang=3DFR style=3D'font-size:9.5pt;font-family:Consolas;col=
or:black'> </span><span lang=3DFR><o:p></o:p></span></p><p class=3DMso=
Normal style=3D'text-autospace:none'><span lang=3DFR style=3D'font-size:9.5=
pt;font-family:Consolas;color:black'> &n=
bsp; Console.WriteLine(</sp=
an><span lang=3DFR style=3D'font-size:9.5pt;font-family:Consolas;color:#A31=
515'>"Conversion takes {0}ms"</span><span lang=3DFR style=3D'font=
-size:9.5pt;font-family:Consolas;color:black'>, t1-t0);</span><span lang=3D=
FR><o:p></o:p></span></p><p class=3DMsoNormal style=3D'text-autospace:none'=
><span lang=3DFR style=3D'font-size:9.5pt;font-family:Consolas;color:black'=
> }</span=
><span lang=3DFR><o:p></o:p></span></p><p class=3DMsoNormal style=3D'text-a=
utospace:none'><span lang=3DFR style=3D'font-size:9.5pt;font-family:Consola=
s;color:black'> </span><span lang=3DFR><o:p></o:p></span></p><p class=
=3DMsoNormal style=3D'text-autospace:none'><span lang=3DFR style=3D'font-si=
ze:9.5pt;font-family:Consolas;color:black'> &n=
bsp; st.Stop();</span><span lang=3DFR><o:p></=
o:p></span></p><p class=3DMsoNormal><span lang=3DFR style=3D'font-size:9.5p=
t;font-family:Consolas;color:black'> &nb=
sp; }</span><span lang=3DFR><o:p></o:p></span></p><p class=3DMsoNormal><spa=
n lang=3DEN-GB> </span><span lang=3DFR><o:p></o:p></span></p><ol style=
=3D'margin-top:0in' start=3D3 type=3D1><li class=3DMsoListParagraph style=
=3D'margin-left:0in;mso-list:l0 level1 lfo1'><span lang=3DEN-GB>The console=
output:</span><span lang=3DFR><o:p></o:p></span></li></ol><p class=3DMsoLi=
stParagraph><span lang=3DEN-GB>=E2=80=9CConversion takes 303ms=E2=80=9D</sp=
an><span lang=3DFR><o:p></o:p></span></p><p class=3DMsoListParagraph><span =
lang=3DEN-GB> </span><span lang=3DFR><o:p></o:p></span></p><p class=3D=
MsoNormal><span lang=3DEN-GB>Is this the right way for this conversion?</sp=
an><span lang=3DFR><o:p></o:p></span></p><p class=3DMsoNormal><span lang=3D=
EN-GB> </span><span lang=3DFR><o:p></o:p></span></p><p class=3DMsoNorm=
al><span lang=3DEN-GB style=3D'font-size:12.0pt'>Environment:</span><span l=
ang=3DFR><o:p></o:p></span></p><div><p class=3DMsoNormal><span lang=3DEN-GB=
style=3D'mso-fareast-language:FR'>Python: v3.8.10</span><span lang=3DFR><o=
:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-GB style=3D'mso-fa=
reast-language:FR'>Pythonnet:</span><span lang=3DFR><o:p></o:p></span></p><=
ol style=3D'margin-top:0in' start=3D1 type=3D1><li class=3DMsoListParagraph=
style=3D'margin-left:0in;mso-list:l1 level1 lfo2'><span lang=3DEN-GB style=
=3D'mso-fareast-language:FR'>Pypi: v</span><span lang=3DFR style=3D'font-si=
ze:9.0pt;font-family:"Lucida Console"'>2.5.2</span><span lang=3DFR><o:p></o=
:p></span></li><li class=3DMsoListParagraph style=3D'margin-left:0in;mso-li=
st:l1 level1 lfo2'><span lang=3DEN-GB style=3D'mso-fareast-language:FR'>Nug=
et : 3.0.0-preview2022-06-03</span><span lang=3DFR><o:p></o:p></span><=
/li></ol><p class=3DMsoNormal><span lang=3DEN-GB style=3D'mso-fareast-langu=
age:FR'>Windows 10 Pro</span><span lang=3DFR><o:p></o:p></span></p><p class=
=3DMsoNormal><span lang=3DEN-GB style=3D'mso-fareast-language:FR'>.NET fram=
ework 4.7.2</span><span lang=3DFR><o:p></o:p></span></p><p class=3DMsoListP=
aragraph><span lang=3DEN-GB style=3D'mso-fareast-language:FR'> </span>=
<span lang=3DFR><o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-=
GB style=3D'mso-fareast-language:FR'>Regards,</span><span lang=3DFR><o:p></=
o:p></span></p><p class=3DMsoNormal><span lang=3DEN-GB style=3D'color:#0000=
7F;mso-fareast-language:FR'>Jordan GUILLOT</span><span lang=3DEN-GB style=
=3D'font-size:10.0pt;color:#000064;mso-fareast-language:FR'> </span><span l=
ang=3DFR><o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-GB styl=
e=3D'mso-fareast-language:FR'> </span><span lang=3DFR><o:p></o:p></spa=
n></p></div><p class=3DMsoNormal><span lang=3DEN-GB> </span><span lang=
=3DFR><o:p></o:p></span></p><p class=3DMsoNormal><o:p> </o:p></p></div=
></body></html>=
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