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Sep 19, 2014
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Idea for more detailed list comprehension explanation #33

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35 changes: 33 additions & 2 deletions part-4.ipynb
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Original file line number Diff line number Diff line change
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"Note how our list comprehension is written within the brackets: The for-loop statement is written at the end whereas the action inside of the for-loop is written first: n * n"
"Let's compare the two methods real quick by highlighting the different logical parts."
]
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"First written as a conventional 'for' loop:\n",
"<pre>\n",
"<span style=\"background:orange\">squared_numbers</span> = []\n",
"<span style=\"background:cyan\">for n in</span> <span style=\"background:yellowgreen\">my_favorite_numbers</span>:\n",
"&nbsp;&nbsp;&nbsp;&nbsp;squared_numbers.append(<span style=\"background:pink\">n * n</span>)\n",
"</pre>"
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"And then written as a list comprehension:\n",
"<pre>\n",
"<span style=\"background:orange\">squared_numbers</span> = [<span style=\"background:pink\">n * n</span> <span style=\"background:cyan\">for n in</span> <span style=\"background:yellowgreen\">my_favorite_numbers</span>]\n",
"</pre>"
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"Look for the <span style=\"background:orange\">new list</span> being created, the <span style=\"background:cyan\">iteration</span> being done over the <span style=\"background:yellowgreen\">orignal list</span> and the <span style=\"background:pink\">transformation</span> being done on each element. List comprehensions are just a cleaner way of building lists from other iterables."
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"### Improving our work\n",
"\n",
"Let's revisit a problem we've already solved in Danny's lecture on list:\n",
"\n",
"Pick every name from a list that begins with a vowel.\n",
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