4.4_notebook_quizz_pandas.ipynb

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    "<h3> Get to Know a Pandas Array </h3>"
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    "You will use the dataframe <code>df</code> for the following:"
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    "import pandas as pd\n",
    "\n",
    "df=pd.DataFrame({'a':[1,2,1],'b':[1,1,1]})"
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    "1) find the unique values in column <code> 'a' </code>:"
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    "2) return a dataframe with only the rows where column <code> a </code> is less than two "
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   "source": [
    "<hr>\n",
    "<small>Copyright &copy; 2018 IBM Cognitive Class. This notebook and its source code are released under the terms of the [MIT License](https://cognitiveclass.ai/mit-license/).</small>"
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