MOD04_1-7.2_Intro_Python.ipynb

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    "# 1-7.2 Intro Python\n",
    "## `while()` loops & increments\n",
    "- while `True`  or forever loops\n",
    "- incrementing in loops\n",
    "- **Boolean operators in while loops**\n",
    "\n",
    "\n",
    "-----  \n",
    "\n",
    "><font size=\"5\" color=\"#00A0B2\"  face=\"verdana\"> <B>Student will be able to</B></font>\n",
    "- create forever loops using `while` and `break`\n",
    "- use incrementing variables in a while loop\n",
    "- **control while loops using Boolean operators**"
   ]
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   "source": [
    "# &nbsp;\n",
    "<font size=\"6\" color=\"#00A0B2\"  face=\"verdana\"> <B>Concept</B></font>\n",
    "## `while` with Boolean comparison\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/f540955e-543b-48f0-8201-3513b0beeed9/Unit1_Section7.2-while-boolean-comp.ism/manifest\",\"type\":\"application/vnd.ms-sstr+xml\"}],[{\"src\":\"http://jupyternootbookwams.streaming.mediaservices.windows.net/f540955e-543b-48f0-8201-3513b0beeed9/Unit1_Section7.2-while-boolean-comp.vtt\",\"srclang\":\"en\",\"kind\":\"subtitles\",\"label\":\"english\"}])\n",
    "## `while` with Boolean comparison operator\n",
    "### `while x < 5:`\n",
    "with increment we used  **`break`** when count becomes greater than some number  \n",
    "\n",
    "The same result can be achieved by using **`while x < 5:`**"
   ]
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   "source": [
    "# &nbsp;\n",
    "<font size=\"6\" color=\"#00A0B2\"  face=\"verdana\"> <B>Examples</B></font>\n",
    "  \n"
   ]
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     "text": [
      "5 !\n",
      "4 !\n",
      "3 !\n",
      "2 !\n",
      "1 !\n",
      "\n",
      "IGNITION!\n"
     ]
    }
   ],
   "source": [
    "# review and run GREET COUNT\n",
    "greet_count = 5\n",
    "\n",
    "# loop while count is greater than 0\n",
    "while greet_count > 0:\n",
    "    print(greet_count, \"!\")\n",
    "    greet_count -= 1\n",
    "print(\"\\nIGNITION!\")"
   ]
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   "source": [
    "# &nbsp;\n",
    "<font size=\"6\" color=\"#B24C00\"  face=\"verdana\"> <B>Task 1</B></font>\n",
    "## `while` with comparison operator \n",
    "### Program: Animal Names\n",
    "- Use **`while`** to get the user input, animal_name, of 4 animals \n",
    "  - use a counter, num_animals, in the while loop condition\n",
    "  - append the names to a string variable, all_animals\n",
    "  - User can exit early by typing \"exit\" (check if animal_name is \"exit\" and break)\n",
    "- when the loop finishes, print the names of all_animals\n",
    "\n",
    "-bonus: print \"no animals\" if animal_name is empty after exiting the loop\n",
    "\n",
    "**Tip:** Think about Sequence and variables that need to be initialized before the while loop"
   ]
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     "text": [
      "Give an animal name: s\n",
      "Give an animal name: blah\n",
      "Give an animal name: bb\n",
      "Give an animal name: dog\n",
      "Give an animal name: ho\n"
     ]
    }
   ],
   "source": [
    "# [ ] Create the Animal Names program, run tests\n",
    "\n",
    "num_animals = 0\n",
    "\n",
    "while num_animals <= 4:\n",
    "    name_animal = input(\"Give an animal name: \")\n",
    "    if name_animal.lower() == \"exit\":\n",
    "        if num_animals == 0:\n",
    "            print(\"no animal name given\")\n",
    "        break\n",
    "    num_animals += 1\n"
   ]
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   "source": [
    "# &nbsp;\n",
    "<font size=\"6\" color=\"#00A0B2\"  face=\"verdana\"> <B>Concept</B></font>\n",
    "## `while` Boolean string tests\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/26728191-873d-42ba-b6b5-48b396a8f42f/Unit1_Section7.2-while-boolean-string.ism/manifest\",\"type\":\"application/vnd.ms-sstr+xml\"}],[{\"src\":\"http://jupyternootbookwams.streaming.mediaservices.windows.net/26728191-873d-42ba-b6b5-48b396a8f42f/Unit1_Section7.2-while-boolean-string.vtt\",\"srclang\":\"en\",\"kind\":\"subtitles\",\"label\":\"english\"}])\n",
    "## Using `while` with a Boolean String Tests\n",
    "A while loop can be controlled by Boolean strings such as `while name.isalpha() == False:`"
   ]
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# &nbsp;\n",
    "<font size=\"6\" color=\"#00A0B2\"  face=\"verdana\"> <B>Example</B></font>"
   ]
  },
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     "text": [
      "enter student's first (Letters only, No spaces): Alexandre\n",
      "\n",
      "Alexandre has been entered as first name\n"
     ]
    }
   ],
   "source": [
    "# review and run example that loops until a valid first name format is entered\n",
    "student_fname = \"\"\n",
    "while student_fname.isalpha() == False:\n",
    "    student_fname = input(\"enter student\\'s first (Letters only, No spaces): \")\n",
    "print(\"\\n\" + student_fname.title(),\"has been entered as first name\")"
   ]
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   "metadata": {},
   "source": [
    "# &nbsp;\n",
    "<font size=\"6\" color=\"#B24C00\"  face=\"verdana\"> <B>Task 2</B></font>\n",
    "## Using `while` with a Boolean String\n",
    "### Program: Long Number\n",
    "#### Create variables\n",
    "- **`int_num`** and get user input **string** of only digits  \n",
    "- **`long_num`** and initialize it as an empty string  \n",
    "\n",
    "#### Create a while loop that runs as long as the input is all digits  \n",
    "\n",
    "#### Inside the while loop   \n",
    "- add **`int_num`** to the end of **`long_num`**\n",
    "- get user input for **`int_num`** again (*inside while loop this time*)  \n",
    "\n",
    "#### After the loop exits \n",
    "- print the value of **`long_num`**   "
   ]
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     "name": "stdout",
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     "text": [
      "write in only digts: 3\n",
      "write in only digts: 44\n",
      "write in only digts: 564\n",
      "write in only digts: a\n",
      "344564\n"
     ]
    }
   ],
   "source": [
    "# [ ] Create the program, run tests\n",
    "long_num = \"\"\n",
    "isnum = 0\n",
    "while isnum==0:\n",
    "    int_num = input(\"write in only digts: \")\n",
    "    if int_num.isdigit() == True:\n",
    "        isnum=1\n",
    "        \n",
    "counter = 0     \n",
    "\n",
    "while isnum == 1:\n",
    "    long_num = (long_num + int_num)\n",
    "    int_num = input(\"write in only digts: \")\n",
    "    if int_num.isdigit() == False:\n",
    "        isnum=0\n",
    "        print(long_num)\n",
    "    \n"
   ]
  },
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# &nbsp;\n",
    "<font size=\"6\" color=\"#B24C00\"  face=\"verdana\"> <B>Task 3</B></font>\n",
    "## Fix the Errors\n",
    "This loop never runs\n",
    "### This is a logic error - there is no ErrorMessage, but the code *doesn't work*"
   ]
  },
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   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
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     "text": [
      "1 x 1 = 1\n",
      "2 x 2 = 4\n",
      "3 x 3 = 9\n",
      "4 x 4 = 16\n",
      "5 x 5 = 25\n"
     ]
    }
   ],
   "source": [
    "# [ ] review the code, run, fix the Logic error\n",
    "count = 1\n",
    "\n",
    "# loop 5 times\n",
    "while count < 6:\n",
    "    print(count, \"x\", count, \"=\", count*count)\n",
    "    count +=1\n",
    "    \n"
   ]
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    "[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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