Remove deprecated unicode2str monty import

pymatgen/analysis/cost.py

@@ -19,7 +19,6 @@
 
 import scipy.constants as const
 from monty.design_patterns import singleton
-from monty.string import unicode2str
 
 from pymatgen.core.composition import Composition
 from pymatgen.core.periodic_table import Element
@@ -100,7 +99,7 @@ def __init__(self, filename):
         self._chemsys_entries = defaultdict(list)
         filename = os.path.join(os.path.dirname(__file__), filename)
         with open(filename, "rt") as f:
-            reader = csv.reader(f, quotechar=unicode2str("|"))
+            reader = csv.reader(f, quotechar="|")
             for row in reader:
                 comp = Composition(row[0])
                 cost_per_mol = float(row[1]) * comp.weight.to("kg") * const.N_A

pymatgen/entries/entry_tools.py

@@ -19,7 +19,6 @@
 from typing import Iterable, List, Set, Union
 
 from monty.json import MontyDecoder, MontyEncoder, MSONable
-from monty.string import unicode2str
 
 from pymatgen.analysis.phase_diagram import PDEntry
 from pymatgen.analysis.structure_matcher import SpeciesComparator, StructureMatcher
@@ -282,8 +281,8 @@ def to_csv(self, filename: str, latexify_names: bool = False):
         with open(filename, "w") as f:
             writer = csv.writer(
                 f,
-                delimiter=unicode2str(","),
-                quotechar=unicode2str('"'),
+                delimiter=",",
+                quotechar='"',
                 quoting=csv.QUOTE_MINIMAL,
             )
             writer.writerow(["Name"] + [el.symbol for el in elements] + ["Energy"])
@@ -307,8 +306,8 @@ def from_csv(cls, filename: str):
         with open(filename, "r", encoding="utf-8") as f:
             reader = csv.reader(
                 f,
-                delimiter=unicode2str(","),
-                quotechar=unicode2str('"'),
+                delimiter=",",
+                quotechar='"',
                 quoting=csv.QUOTE_MINIMAL,
             )
             entries = list()