Saving internal property maps, not loading back in

I am storing a graph with internal property maps in gt format. Upon loading it back in it appears that all the internal properties were not saved. Is this because of the 2.57 version?

What can I do to save the internal property maps?


Version information below:

In [25]: gt.show_config()
version: 2.57
gcc version: 13.2.0
compilation flags: -DBOOST_ALLOW_DEPRECATED_HEADERS -DNDEBUG -Wdate-time -D_FORTIFY_SOURCE=2 -fopenmp -O3 -fvisibility=default -fvisibility-inlines-hidden -Wno-deprecated -Wall -Wextra -ftemplate-backtrace-limit=0 -g -O2 -ffile-prefix-map=/build/graph-tool-n1IAsq/graph-tool-2.57+ds=. -flto=auto -ffat-lto-objects -fstack-protector-strong -Wformat -Werror=format-security -fdebug-prefix-map=/build/graph-tool-n1IAsq/graph-tool-2.57+ds=/usr/src/graph-tool-2.57+ds-1ubuntu1 -Wl,-Bsymbolic-functions -flto=auto -ffat-lto-objects -Wl,-z,relro -Wl,-z,now
install prefix: /usr
python dir: /usr/lib/python3.11/dist-packages
graph filtering: True
openmp: True
uname: Linux laptop 6.5.0-28-generic #29-Ubuntu SMP PREEMPT_DYNAMIC Thu Mar 28 23:46:48 UTC 2024 x86_64

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My apologies, apparently I was saving the graph before naming the properties. The latter appears to internalize the properties. Is that correct?

The code snipped below works as documented in version 2.47:

from graph_tool.all import *

#Make a graph
g = Graph()

#Populate with two connected vertices

#Make internal properties
g.ep['weight value'] = eweight
g.vp['color value'] = vcolor


gprop=g.new_graph_property("string")['graph name'] = gprop
gprop="Try saving properties"



Looks fine, except the line:

gprop="Try saving properties"

which should be instead

gprop[g]="Try saving properties"

Otherwise the graph property will not be set.

Ah yes, of course! Thank you!