evince to xdg-open,name of core to pycore and test to pyexamples

pyexamples/test_simple.py

@@ -1,7 +1,7 @@
 
 import sys
 sys.path.append('../')
-from core.tikzeng import *
+from pycore.tikzeng import *
 
 # defined your arch
 arch = [

pyexamples/unet.py

@@ -1,8 +1,8 @@
 
 import sys
 sys.path.append('../')
-from core.tikzeng import *
-from core.blocks  import *
+from pycore.tikzeng import *
+from pycore.blocks  import *
 
 arch = [ 
     to_head('..'), 

tikzmake.sh

@@ -7,5 +7,5 @@ pdflatex $1.tex
 rm *.aux *.log *.vscodeLog
 rm *.tex
 
-evince $1.pdf
+xdg-open $1.pdf