notebooks/beginner/exercises/01_strings_exercise.ipynb

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 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 1. Fill missing pieces\n",
    "Fill `____` pieces below to have correct values for `lower_cased`, `stripped` and `stripped_lower_case` variables."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "original = \" Python strings are COOL! \"\n",
    "lower_cased = original._____\n",
    "stripped = ____.strip()\n",
    "stripped_lower_cased = original._____._____"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Let's verify that the implementation is correct by running the cell below. `assert` will raise `AssertionError` if the statement is not true.  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
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   },
   "outputs": [],
   "source": [
    "assert lower_cased == \" python strings are cool! \"\n",
    "assert stripped == \"Python strings are COOL!\"\n",
    "assert stripped_lower_cased == \"python strings are cool!\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 2. Prettify ugly string\n",
    "Use `str` methods to convert `ugly` to wanted `pretty`."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "editable": false
   },
   "outputs": [],
   "source": [
    "ugly = \" tiTle of MY new Book\\n\\n\""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Your implementation:\n",
    "pretty = \"TODO\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Let's make sure that it does what we want. `assert` raises [`AssertionError`](https://docs.python.org/3/library/exceptions.html#AssertionError) if the statement is not `True`."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "editable": false
   },
   "outputs": [],
   "source": [
    "print(f\"pretty: {pretty}\")\n",
    "assert pretty == \"Title Of My New Book\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 3. Format string based on existing variables\n",
    "Create `sentence` by using `verb`, `language`, and `punctuation` and any other strings you may need."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "editable": false
   },
   "outputs": [],
   "source": [
    "verb = \"is\"\n",
    "language = \"Python\"\n",
    "punctuation = \"!\""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Your implementation:\n",
    "sentence = \"TODO\""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "editable": false
   },
   "outputs": [],
   "source": [
    "print(f\"sentence: {sentence}\")\n",
    "assert sentence == \"Learning Python is fun!\""
   ]
  }
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