Issue 1673 import parameters chemistry error

CHANGELOG.md

@@ -56,6 +56,7 @@ example notebook ([#1602](https://github.com/pybamm-team/PyBaMM/pull/1602))
 
 ## Bug fixes
 
+-   Fixed bug with `load_function` ([#1675](https://github.com/pybamm-team/PyBaMM/pull/1675))
 -   Updated documentation to include some previously missing functions, such as `erf` and `tanh` ([#1628](https://github.com/pybamm-team/PyBaMM/pull/1628))
 -   Fixed reading citation file without closing ([#1620](https://github.com/pybamm-team/PyBaMM/pull/1620))
 -   Porosity variation for SEI and plating models is calculated from the film thickness rather than from a separate ODE ([#1617](https://github.com/pybamm-team/PyBaMM/pull/1617))

pybamm/util.py

@@ -273,9 +273,12 @@ def load_function(filename):
     # Assign path to _ and filename to tail
     _, tail = os.path.split(filename)
 
-    # Strip absolute path to pybamm/input/exapmle.py
+    # Strip absolute path to pybamm/input/example.py
     if "pybamm" in filename:
         root_path = filename[filename.rfind("pybamm") :]
+    elif os.getcwd() in filename:
+        root_path = filename.replace(os.getcwd(), "")
+        root_path = root_path[1:]
     else:
         root_path = filename
 

tests/unit/test_parameters/test_parameter_values.py

@@ -4,6 +4,7 @@
 
 import os
 import tempfile
+import subprocess
 import unittest
 
 import numpy as np
@@ -71,6 +72,18 @@ def test_update_from_chemistry(self):
         with self.assertRaisesRegex(KeyError, "must provide 'cell' parameters"):
             pybamm.ParameterValues(chemistry={"chemistry": "lithium_ion"})
 
+    def test_update_from_chemistry_local(self):
+        # Copy parameters
+        cmd = ["pybamm_edit_parameter", "-f", "lithium_ion"]
+        subprocess.run(cmd)
+
+        # Import parameters from chemistry
+        pybamm.ParameterValues(chemistry=pybamm.parameter_sets.Chen2020)
+
+        # Clean up parameter files
+        cmd = ["rm", "-r", "lithium_ion"]
+        subprocess.run(cmd)
+
     def test_update(self):
         # converts to dict if not
         param = pybamm.ParameterValues(chemistry=pybamm.parameter_sets.Chen2020)