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added conversion to float

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rasbt 2014-05-14 01:34:47 -04:00
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commit ed0eb89f62
1 changed files with 90 additions and 12 deletions
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102
tutorials/sorting_csvs.ipynb
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@ -1,7 +1,7 @@
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@ -56,6 +56,7 @@
"## Sections\n", "## Sections\n",
"- [Reading in a CSV file](#reading)\n", "- [Reading in a CSV file](#reading)\n",
"- [Printing the CSV file contents](#printing)\n", "- [Printing the CSV file contents](#printing)\n",
"- [Converting numeric cells to floats](#floats)\n",
"- [Sorting the CSV file](#sorting)\n", "- [Sorting the CSV file](#sorting)\n",
"- [Marking min/max values in particular columns](#marking)\n", "- [Marking min/max values in particular columns](#marking)\n",
"- [Writing out the modified table to as a new CSV file](#writing)\n", "- [Writing out the modified table to as a new CSV file](#writing)\n",
@ -140,7 +141,7 @@
"language": "python", "language": "python",
"metadata": {}, "metadata": {},
"outputs": [], "outputs": [],
"prompt_number": 1 "prompt_number": 4
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@ -166,7 +167,7 @@
] ]
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@ -212,7 +213,7 @@
"language": "python", "language": "python",
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@ -245,7 +246,76 @@
] ]
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{
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"source": [
"<a name='floats'></a>\n",
"<br>\n",
"<br>"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Converting numeric cells to floats"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"To avoid problems with the sorting approach that can occur when we have negative values in some cells, let us define a function that converts all numeric cells into float values."
]
},
{
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"input": [
"def convert_cells_to_floats(csv_cont):\n",
" \"\"\" \n",
" Converts cells to floats if possible\n",
" (modifies input CSV content list).\n",
" \n",
" \"\"\"\n",
" for row in range(len(csv_cont)):\n",
" for cell in range(len(csv_cont[row])):\n",
" try:\n",
" csv_cont[row][cell] = float(csv_cont[row][cell])\n",
" except ValueError:\n",
" pass "
],
"language": "python",
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{
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"input": [
"print('first 3 rows:')\n",
"for row in range(3):\n",
" print(csv_cont[row])"
],
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"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"first 3 rows:\n",
"['name', 'column1', 'column2', 'column3']\n",
"['abc', 1.1, 4.2, 1.2]\n",
"['def', 2.1, 1.4, 5.2]\n"
]
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@ -304,7 +374,7 @@
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@ -360,7 +430,7 @@
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@ -425,7 +495,7 @@
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@ -447,7 +517,7 @@
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@ -484,7 +554,7 @@
] ]
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@ -573,7 +643,15 @@
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