Fix initialization of WrappedTreeSequence

doc/misc/changelog.md

@@ -5,6 +5,11 @@ updates to latest `fwdpp` version, etc.
 
 ## Next release
 
+Bug fixes
+
+* Fix error in decoding provenance rows when initializing {class}`fwdpy11.tskit_tools.WrappedTreeSequence`.
+  {pr}`760`
+
 Dependencies:
 
 * `demes` bumped to `>=0.1.2` in requirements files.

fwdpy11/tskit_tools/trees.py

@@ -16,6 +16,7 @@
 # You should have received a copy of the GNU General Public License
 # along with fwdpy11.  If not, see <http://www.gnu.org/licenses/>.
 #
+import json
 import typing
 
 import numpy as np
@@ -47,7 +48,7 @@ def _toplevel_metadata_value(self, name):
     def __init__(self, ts: tskit.TreeSequence):
         found = False
         for row in ts.provenances():
-            record = eval(row.record)
+            record = json.loads(row.record)
             if "software" in record:
                 if record["software"]["name"] == "fwdpy11":
                     found = True

tests/test_wrapped_tskit_tree_sequence.py

@@ -18,6 +18,7 @@
 #
 
 import fwdpy11
+import msprime
 import numpy as np
 import pytest
 
@@ -101,3 +102,13 @@ def test_demes_graph_property(gutenkunst):
     ts = pop.dump_tables_to_tskit()
     wts = fwdpy11.tskit_tools.WrappedTreeSequence(ts)
     assert wts.demes_graph is None
+
+
+def test_with_msprime_provenance_added():
+    initial_ts = msprime.sim_ancestry(samples=200, population_size=100, random_seed=1)
+    pop = fwdpy11.DiploidPopulation.create_from_tskit(initial_ts)
+    ts = pop.dump_tables_to_tskit()
+    ts = msprime.sim_mutations(ts, rate=1e-5, random_seed=1)
+    assert ts.tables.provenances.num_rows == 2
+    wts = fwdpy11.tskit_tools.WrappedTreeSequence(ts)
+    assert wts.ts.tables.provenances.num_rows == 2