prompt template from string (#884)

docs/modules/prompts/examples/prompt_management.ipynb

@@ -151,6 +151,47 @@
     "multiple_input_prompt.format(adjective=\"funny\", content=\"chickens\")"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "72f32ff2",
+   "metadata": {},
+   "source": [
+    "## From Template\n",
+    "You can also easily load a prompt template by just specifying the template, and not worrying about the input variables."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "id": "2a81f2f8",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "template = \"Tell me a {adjective} joke about {content}.\"\n",
+    "multiple_input_prompt = PromptTemplate.from_template(template)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "id": "d365b144",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "PromptTemplate(input_variables=['adjective', 'content'], output_parser=None, template='Tell me a {adjective} joke about {content}.', template_format='f-string', validate_template=True)"
+      ]
+     },
+     "execution_count": 3,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "multiple_input_prompt"
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "b2dd6154",