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hi,
I tried to reproduce your code in my plugin for qgis:

in windows I always get this error:
"The point has no z coordinates"

this is my code:

on_tre_d_pressed def(self):
# layer.select ([])
# layer.setSelectedFeatures ([obj.id () for obj in layer])
# tre_d =''
mylayer = self.iface.activeLayer()
# tre_d (mylayer)
if self.tab_5.text() == "":
tab_5 = 0
else:
tab_5 = int(self.tab_5.text())

import loads from shapely.wkb

x = []
y = []
z = []
for elem in mylayer.selectedFeatures ():

geom = elem.geometry()
wkb = geom.asWkb()
data = loads(wkb)
x.append(data.x)
y.append(data.y)
z.append(data.z)

x = []
y = []
z = []
for elem in mylayer.selectedFeatures ():
geom = elem.geometry()
x.append(geom.asPoint()[0])
y.append(geom.asPoint()[1])
tab = "(z.append (elem.attributeMap()[%d].toFloat()[0]))"% int (self.tab_5.text())
eval(tab)

in the python console the error is intercepted near "z.append (data.z)"

Do you know why?
any idea?

thanks