fixed faq.ipynb and removed irrelevant section

documentation_builder/faq.ipynb

@@ -78,7 +78,7 @@
     "model = cobra.io.load_model(\"iYS1720\")\n",
     "\n",
     "for metabolite in model.metabolites:\n",
-    "    metabolite.id = \"test_\" + metabolite.id\n",
+    "    metabolite.id = f\"test_{metabolite.id}\"\n",
     "\n",
     "try:\n",
     "    model.metabolites.get_by_id(model.metabolites[0].id)\n",
@@ -289,7 +289,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "With optlang solvers, the LP formulation of a model is obtained by it's string representation. All solvers behave the same way."
+    "With optlang solvers, the LP formulation of a model is obtained by its string representation. All solvers behave the same way."
    ]
   },
   {
@@ -302,40 +302,6 @@
     "    out.write(str(model.solver))"
    ]
   },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "### For cobrapy's internal solvers"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "With the internal solvers, we first create the problem and use functions bundled with the solver. \n",
-    "\n",
-    "Please note that unlike the LP file format, the MPS file format does not specify objective direction and is always a minimization. Some (but not all) solvers will rewrite the maximization as a minimization."
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 8,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "model = cobra.io.load_model(\"iYS1720\")\n",
-    "\n",
-    "# glpk through cglpk\n",
-    "glpk = cobra.solvers.cglpk.create_problem(model)\n",
-    "glpk.write(\"test.lp\")\n",
-    "glpk.write(\"test.mps\")  # will not rewrite objective\n",
-    "# cplex\n",
-    "cplex = cobra.solvers.cplex_solver.create_problem(model)\n",
-    "cplex.write(\"test.lp\")\n",
-    "cplex.write(\"test.mps\")  # rewrites objective"
-   ]
-  },
   {
    "cell_type": "markdown",
    "metadata": {},