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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# List Comprehensions\n",
"\n",
"Complete the following set of exercises to solidify your knowledge of list comprehensions."
]
},
{
"cell_type": "code",
"execution_count": 1,
"metadata": {},
"outputs": [],
"source": [
"import os as os"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"#### 1. Use a list comprehension to create and print a list of consecutive integers starting with 1 and ending with 50."
]
},
{
"cell_type": "code",
"execution_count": 5,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50]\n"
]
}
],
"source": [
"#your code here\n",
"a = []\n",
"\n",
"a = [i for i in range(1,51)]\n",
"\n",
"print(a)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"#### 2. Use a list comprehension to create and print a list of even numbers starting with 2 and ending with 200."
]
},
{
"cell_type": "code",
"execution_count": 8,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"[2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100, 102, 104, 106, 108, 110, 112, 114, 116, 118, 120, 122, 124, 126, 128, 130, 132, 134, 136, 138, 140, 142, 144, 146, 148, 150, 152, 154, 156, 158, 160, 162, 164, 166, 168, 170, 172, 174, 176, 178, 180, 182, 184, 186, 188, 190, 192, 194, 196, 198, 200]\n"
]
}
],
"source": [
"#your code here\n",
"\n",
"a = []\n",
"\n",
"a = [i for i in range(2,202,2)]\n",
"\n",
"print(a)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"#### 3. Use a list comprehension to create and print a list containing all elements of the 10 x 4 array below."
]
},
{
"cell_type": "code",
"execution_count": 1,
"metadata": {},
"outputs": [],
"source": [
"a = [[0.84062117, 0.48006452, 0.7876326 , 0.77109654],\n",
" [0.44409793, 0.09014516, 0.81835917, 0.87645456],\n",
" [0.7066597 , 0.09610873, 0.41247947, 0.57433389],\n",
" [0.29960807, 0.42315023, 0.34452557, 0.4751035 ],\n",
" [0.17003563, 0.46843998, 0.92796258, 0.69814654],\n",
" [0.41290051, 0.19561071, 0.16284783, 0.97016248],\n",
" [0.71725408, 0.87702738, 0.31244595, 0.76615487],\n",
" [0.20754036, 0.57871812, 0.07214068, 0.40356048],\n",
" [0.12149553, 0.53222417, 0.9976855 , 0.12536346],\n",
" [0.80930099, 0.50962849, 0.94555126, 0.33364763]];"
]
},
{
"cell_type": "code",
"execution_count": 3,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"[0.84062117, 0.48006452, 0.7876326, 0.77109654, 0.44409793, 0.09014516, 0.81835917, 0.87645456, 0.7066597, 0.09610873, 0.41247947, 0.57433389, 0.29960807, 0.42315023, 0.34452557, 0.4751035, 0.17003563, 0.46843998, 0.92796258, 0.69814654, 0.41290051, 0.19561071, 0.16284783, 0.97016248, 0.71725408, 0.87702738, 0.31244595, 0.76615487, 0.20754036, 0.57871812, 0.07214068, 0.40356048, 0.12149553, 0.53222417, 0.9976855, 0.12536346, 0.80930099, 0.50962849, 0.94555126, 0.33364763]\n"
]
}
],
"source": [
"#your code here\n",
"\n",
"\n",
"b = []\n",
"\n",
"b = [ recorro_a2 for recorro_a1 in a for recorro_a2 in recorro_a1]\n",
"\n",
"print(b)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"#### 4. Add a condition to the list comprehension above so that only values greater than or equal to 0.5 are printed."
]
},
{
"cell_type": "code",
"execution_count": 9,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"[0.84062117, 0.7876326, 0.77109654, 0.81835917, 0.87645456, 0.7066597, 0.57433389, 0.92796258, 0.69814654, 0.97016248, 0.71725408, 0.87702738, 0.76615487, 0.57871812, 0.53222417, 0.9976855, 0.80930099, 0.50962849, 0.94555126]\n"
]
}
],
"source": [
"#your code here\n",
"c = []\n",
"c = [d for i in a for d in i if d >= 0.5]\n",
"\n",
"print(c)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"#### 5. Use a list comprehension to create and print a list containing all elements of the 5 x 2 x 3 array below."
]
},
{
"cell_type": "code",
"execution_count": 15,
"metadata": {},
"outputs": [],
"source": [
"b = [[[0.55867166, 0.06210792, 0.08147297],\n",
" [0.82579068, 0.91512478, 0.06833034]],\n",
"\n",
" [[0.05440634, 0.65857693, 0.30296619],\n",
" [0.06769833, 0.96031863, 0.51293743]],\n",
"\n",
" [[0.09143215, 0.71893382, 0.45850679],\n",
" [0.58256464, 0.59005654, 0.56266457]],\n",
"\n",
" [[0.71600294, 0.87392666, 0.11434044],\n",
" [0.8694668 , 0.65669313, 0.10708681]],\n",
"\n",
" [[0.07529684, 0.46470767, 0.47984544],\n",
" [0.65368638, 0.14901286, 0.23760688]]];"
]
},
{
"cell_type": "code",
"execution_count": 16,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"[0.55867166, 0.06210792, 0.08147297, 0.82579068, 0.91512478, 0.06833034, 0.05440634, 0.65857693, 0.30296619, 0.06769833, 0.96031863, 0.51293743, 0.09143215, 0.71893382, 0.45850679, 0.58256464, 0.59005654, 0.56266457, 0.71600294, 0.87392666, 0.11434044, 0.8694668, 0.65669313, 0.10708681, 0.07529684, 0.46470767, 0.47984544, 0.65368638, 0.14901286, 0.23760688]\n"
]
}
],
"source": [
"#your code here\n",
"f= []\n",
"f = [entro3 for entro1 in b for entro2 in entro1 for entro3 in entro2]\n",
"print(f)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"#### 6. Add a condition to the list comprehension above so that the last value in each subarray is printed, but only if it is less than or equal to 0.5."
]
},
{
"cell_type": "code",
"execution_count": 20,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"[0.08147297, 0.06833034, 0.30296619, 0.45850679, 0.11434044, 0.10708681, 0.47984544, 0.23760688]\n"
]
}
],
"source": [
"#your code here\n",
"f= []\n",
"f = [entro2[-1] for entro1 in b for entro2 in entro1 if entro2[-1] <= 0.5]\n",
"print(f)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### Bonus"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Try to solve these katas using list comprehensions."
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Easy**\n",
"- [Insert values](https://www.codewars.com/kata/invert-values)\n",
"- [Sum Square(n)](https://www.codewars.com/kata/square-n-sum)\n",
"- [Digitize](https://www.codewars.com/kata/digitize)\n",
"- [List filtering](https://www.codewars.com/kata/list-filtering)\n",
"- [Arithmetic list](https://www.codewars.com/kata/541da001259d9ca85d000688)\n",
"\n",
"**Medium**\n",
"- [Multiples of 3 or 5](https://www.codewars.com/kata/514b92a657cdc65150000006)\n",
"- [Count of positives / sum of negatives](https://www.codewars.com/kata/count-of-positives-slash-sum-of-negatives)\n",
"- [Categorize new member](https://www.codewars.com/kata/5502c9e7b3216ec63c0001aa)\n",
"\n",
"**Advanced**\n",
"- [Queue time counter](https://www.codewars.com/kata/queue-time-counter)"
]
}
],
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"display_name": "base",
"language": "python",
"name": "python3"
},
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"codemirror_mode": {
"name": "ipython",
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"nbconvert_exporter": "python",
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