Python-basic-1-test.ipynb

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    "***File Input and Output***\n",
    "===========================\n",
    "Use the format below to:\n",
    "1.  Open a file \"file\", for \"r+\" (reading and writing)\n",
    "+   Read the file (lines)\n",
    "+   Close the file\n",
    "\n",
    "This is a simple example to illustrate file input and output."
   ]
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     "name": "stdout",
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     "text": [
      "['Thank You OSSSB\\n', 'Thank You\\n', 'God Bless and Thank you Lord']\n"
     ]
    }
   ],
   "source": [
    "import fileinput\n",
    "with open(\"tsb.txt\", \"r+\") as f:\n",
    "  lines = f.readlines() # read entire file into memory\n",
    "  print (lines)\n",
    "  #f.seek(0) # go back to the beginning of the file\n",
    "  #f.writelines(filter(good, lines)) # dump the filtered lines back\n",
    "  #f.truncate() # wipe the remains of the old file\n",
    "  f.close()\n",
    "\n"
   ]
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    "***Creating and Calling a Function***\n",
    "=====================================\n",
    "The box below illustrates creating a function in Python, then using that function to do something, and finally calling the function with an argument (parameter), and printing it to see the result.\n",
    "\n",
    "1.  Define a function - name, and parameter/argument\n",
    "+   Create details of whatever the function will do - in this case, count and print items in a list\n",
    "+   The function will count the number of items in the list and return that total\n",
    "+   go through each member of the list (\"item\", \"list\")\n",
    "+   Increase the count by 1, to keep track\n",
    "+   When complete, it will return the total\n",
    "+   Call the function with any valid list (\"my_list\") and see what the function returns (the total)\n",
    "+   Note: The list items are printed IN THE FUNCTION\n",
    "+   Note: The total count is a result of the function call and is printed OUTSIDE the function (last line)\n",
    "\n"
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    "def test_fun(test):\n",
    "    count = 0\n",
    "    for item in (test):\n",
    "        print (count, \": \", item)\n",
    "        count = count + 1\n",
    "    return count\n",
    "\n",
    "my_list = ['Hari', 'Rob', 'Dan', 'Audrey', 'Laurie', 'Thea', 'Taz', 'Staci', 'Leticia']\n",
    "print (\"The total number of names in the list is: \", test_fun(my_list))\n",
    "\n",
    "\n"
   ]
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    "http://nbviewer.ipython.org/gist/manujeevanprakash/7e47301f0b50a98232ca\n",
    "\n",
    "Item / Process  | Name\n",
    "  ------------- | -------------\n",
    "  Function      | test_fun\n",
    "  arguments     | (test)\n",
    "  variable      | count\n",
    "  returns       | countItem \n",
    "\n",
    "  \n",
    "  ***Test a List***\n",
    "========================\n",
    "In the simple function definition and detail - *test_fun()* above, we pass a list, called test, into the function, so that it can process it.\n",
    "When you actually call the function, it can be called by any other allowed name.  \n",
    "Inside the function:\n",
    "1. We define a variable, count, and set it to 0 initially.\n",
    "+ Then, for every item in the list, we list the sequence #, and format and print it\n",
    "* We increase the counter by 1\n",
    "* Then we return the total # of items in the list (this is the function's purpose)\n",
    "\n",
    "Then, in the main area, we define a list of our own (\"my_list\").\n",
    "**Then we call and print the results of calling the function in one line.**\n"
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     "text": [
      "[ 89.    56.34  76.    89.    98.  ]\n",
      "float64\n"
     ]
    }
   ],
   "source": [
    "# easiest way to create an array is by using an array function\n",
    "import numpy as np # I am importing numpy as np\n",
    "\n",
    "scores = [89,56.34, 76,89, 98]\n",
    "first_arr =np.array(scores)\n",
    "print (first_arr)\n",
    "print (first_arr.dtype)  # .dtype return the data type of the array object"
   ]
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   "source": [
    "***Writing and Displaying Equations***\n",
    "======================================\n",
    "\n",
    "The example below illustrates how to write an equation that will be displayed mathematically, with symbols"
   ]
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    "# \\begin{equation*}\n",
    "\\left( \\sum_{k=1}^n a_k b_k \\right)^2 \\leq \\left( \\sum_{k=1}^n a_k^2 \\right) \\left( \\sum_{k=1}^n b_k^2 \\right)\n",
    "\\end{equation*}"
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   "source": [
    "\\begin{equation*}\n",
    "\\left( \\sum_{k=1}^n a_k b_k \\right)^2 \\leq \\left( \\sum_{k=1}^n a_k^2 \\right) \\left( \\sum_{k=1}^n b_k^2 \\right)\n",
    "\\end{equation*}"
   ]
  }
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