Add notebook: Introduction to Python (#337)

* Add notebook: Introduction to Python

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Add notebook to the index

* Apply suggestions from code review

Co-authored-by: Aliaksandr Yakutovich <yakutovicha@gmail.com>

* add fixes after review

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* add fixes after review

* Small changes to "Variables"

* Add "underscore" to valid chars

* Apply suggestions from code review

Co-authored-by: Fábio Lopes <33908066+fabioacl@users.noreply.github.com>

* add hyperlink for function arguments

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Aliaksandr Yakutovich <yakutovicha@gmail.com>
Co-authored-by: Edoardo Baldi <edoardob90@gmail.com>
Co-authored-by: Fábio Lopes <33908066+fabioacl@users.noreply.github.com>

Author: 5 people

00_index.ipynb

@@ -7,6 +7,7 @@
     "# Introduction\n",
     "\n",
     "- [Introduction to the tutorial](./00_intro.ipynb)\n",
+    "- [A quick tour of Python](./00_python_intro.ipynb)\n",
     "\n",
     "# Basic Tutorial\n",
     "\n",
@@ -42,13 +43,6 @@
     "\n",
     "- [Parallelism and concurrency in Python](./14_threads.ipynb)\n"
    ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": []
   }
  ],
  "metadata": {