Mod1_2-1.1_Intro_Python-checkpoint.ipynb

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    "# 2-1.1 Intro Python\n",
    "## Sequence: String\n",
    "- **Accessing String Characters with index**\n",
    "- Accessing sub-strings with index slicing\n",
    "- Iterating through Characters of a String\n",
    "- More String Methods\n",
    "\n",
    "----- \n",
    "\n",
    "><font size=\"5\" color=\"#00A0B2\"  face=\"verdana\"> <B>Student will be able to</B></font>  \n",
    "- **Work with String Characters by index\n",
    "**\n",
    "- Slice strings into substrings\n",
    "- Iterate through String Characters\n",
    "- Use String Methods"
   ]
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   "source": [
    "# &nbsp;\n",
    "<font size=\"6\" color=\"#00A0B2\"  face=\"verdana\"> <B>Concepts</B></font>\n",
    "## Accessing a single String Character\n",
    "[![view video](https://iajupyterprodblobs.blob.core.windows.net/imagecontainer/common/play_video.png)]( http://edxinteractivepage.blob.core.windows.net/edxpages/f7cff1a7-5601-48a1-95a6-fd1fdfabd20e.html?details=[{\"src\":\"http://jupyternootbookwams.streaming.mediaservices.windows.net/a8044252-4f2f-4960-b37b-70da8fe4769a/Unit2_Section1.1a-String_Index_Address.ism/manifest\",\"type\":\"application/vnd.ms-sstr+xml\"}],[{\"src\":\"http://jupyternootbookwams.streaming.mediaservices.windows.net/a8044252-4f2f-4960-b37b-70da8fe4769a/Unit2_Section1.1a-String_Index_Address.vtt\",\"srclang\":\"en\",\"kind\":\"subtitles\",\"label\":\"english\"}])\n",
    "### addressing a string index\n",
    "Strings are sequences of characters.  Another common sequence type used in this course is a **list**.  Sequences index items counting from 0 for the first item.\n",
    "\n",
    "![string with index for each letter](https://iajupyterprodblobs.blob.core.windows.net/imagecontainer/string_indexes.PNG)  \n",
    "\n",
    "```python\n",
    "# assign string to student_name\n",
    "student_name = \"Alton\"\n",
    "# first character is at index 0\n",
    "student_name[0]\n",
    "```  \n"
   ]
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   "source": [
    "# &nbsp;\n",
    "<font size=\"6\" color=\"#00A0B2\"  face=\"verdana\"> <B>Examples</B></font>"
   ]
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    "# [ ] review and run example - note the first element is always index = 0\n",
    "student_name = \"Alton\"\n",
    "print(student_name[0], \"<-- first character at index 0\")\n",
    "print(student_name[1])\n",
    "print(student_name[2])\n",
    "print(student_name[3])\n",
    "print(student_name[4])"
   ]
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   "source": [
    "# [ ] review and run example\n",
    "student_name = \"Jin\"\n",
    "if student_name[0].lower() == \"a\":\n",
    "    print('Winner! Name starts with A:', student_name)\n",
    "elif student_name[0].lower() == \"j\":\n",
    "    print('Winner! Name starts with J:', student_name)\n",
    "else:\n",
    "    print('Not a match, try again tomorrow:', student_name)"
   ]
  },
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   "source": [
    "# [ ] review and run ERROR example\n",
    "# cannot index out of range\n",
    "student_name = \"Tobias\"\n",
    "print(student_name[6])"
   ]
  },
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   "metadata": {
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   "source": [
    "# &nbsp;\n",
    "<font size=\"6\" color=\"#B24C00\"  face=\"verdana\"> <B>Task 1</B></font>\n",
    "\n",
    "## Work with individual string characters  \n",
    "\n",
    "|                                                                 |\n",
    "|-----------------------------------------------------------------|\n",
    "|  **Remember:** the first character in a string is at **index 0**|\n",
    "|                                                                 |\n"
   ]
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   "source": [
    "# [ ] assign a string 5 or more letters long to the variable: street_name\n",
    "# [ ] print the 1st, 3rd and 5th characters\n",
    "\n",
    "\n"
   ]
  },
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   "source": [
    "# [ ] Create an input variable: team_name - ask that second letter = \"i\", \"o\", or \"u\"\n",
    "# [ ] Test if team_name 2nd character = \"i\", \"o\", or \"u\" and print a message\n",
    "# note: use if, elif and else\n",
    "\n"
   ]
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   "source": [
    "# &nbsp;\n",
    "<font size=\"6\" color=\"#00A0B2\"  face=\"verdana\"> <B>Concepts</B></font>\n",
    "## Using a negative index \n",
    "[![view video](https://iajupyterprodblobs.blob.core.windows.net/imagecontainer/common/play_video.png)](http://edxinteractivepage.blob.core.windows.net/edxpages/f7cff1a7-5601-48a1-95a6-fd1fdfabd20e.html?details=[{\"src\":\"http://jupyternootbookwams.streaming.mediaservices.windows.net/28da3b48-538d-4412-ae7b-ce95e9892ce9/Unit2_Section1.1b-Using_a_Negative_Index.ism/manifest\",\"type\":\"application/vnd.ms-sstr+xml\"}],[{\"src\":\"http://jupyternootbookwams.streaming.mediaservices.windows.net/28da3b48-538d-4412-ae7b-ce95e9892ce9/Unit2_Section1.1b-Using_a_Negative_Index.vtt\",\"srclang\":\"en\",\"kind\":\"subtitles\",\"label\":\"english\"}])\n",
    "### Access the end of a string using -1\n",
    "Strings assign an **index** number address to each string character\n",
    "\n",
    "- first character in a string is index 0\n",
    "- last character in a string is index **-1**\n",
    "\n",
    "![negative string index counts from the end](https://iajupyterprodblobs.blob.core.windows.net/imagecontainer/string_neg_index.PNG)\n",
    "\n",
    "To access the last character in a string\n",
    "```python\n",
    "student_name[-1]\n",
    "```\n"
   ]
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   "source": [
    "### &nbsp;\n",
    "<font size=\"6\" color=\"#00A0B2\"  face=\"verdana\"> <B>Examples</B></font>\n",
    "\n"
   ]
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   "cell_type": "markdown",
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   "source": [
    "#### access the last character with the -1 index\n",
    "negative index counts back from the last character in a string  "
   ]
  },
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   "source": [
    "# [ ] review and run example\n",
    "student_name = \"Joana\"\n",
    "\n",
    "# get last letter\n",
    "end_letter = student_name[-1]\n",
    "print(student_name,\"ends with\", \"'\" + end_letter + \"'\")"
   ]
  },
  {
   "cell_type": "code",
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   "source": [
    "# [ ] review and run example\n",
    "# get second to last letter\n",
    "second_last_letter = student_name[-2]\n",
    "print(student_name,\"has 2nd to last letter of\", \"'\" + second_last_letter + \"'\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
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   "outputs": [],
   "source": [
    "# [ ] review and run example\n",
    "# you can get to the same letter with index counting + or -\n",
    "print(\"for\", student_name)\n",
    "print(\"index 3 =\", \"'\" + student_name[3] + \"'\")\n",
    "print(\"index -2 =\",\"'\" + student_name[-2] + \"'\")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "collapsed": true
   },
   "source": [
    "# &nbsp;\n",
    "<font size=\"6\" color=\"#B24C00\"  face=\"verdana\"> <B>Task 2</B></font>\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "# [ ] assign a string 5 or more letters long to the variable: street_name\n",
    "# [ ] print the last 3 characters of street_name\n",
    "\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "# [ ] create and assign string variable: first_name\n",
    "\n",
    "# [ ] print the first and last letters of name\n",
    "\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "collapsed": true
   },
   "source": [
    "# &nbsp;\n",
    "<font size=\"6\" color=\"#B24C00\"  face=\"verdana\"> <B>Task 3</B></font>  \n",
    "## Fix the Errors"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": false
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   "outputs": [],
   "source": [
    "# [ ] Review, Run, Fix the error using string index\n",
    "shoe = \"tennis\"\n",
    "# print the last letter\n",
    "print(shoe(-1))\n",
    "\n"
   ]
  },
  {
   "cell_type": "markdown",
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   "source": [
    "[Terms of use](http://go.microsoft.com/fwlink/?LinkID=206977) &nbsp; [Privacy & cookies](https://go.microsoft.com/fwlink/?LinkId=521839) &nbsp; © 2017 Microsoft"
   ]
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