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‎02-assertions.ipynb‎

Lines changed: 125 additions & 22 deletions
Original file line numberDiff line numberDiff line change
@@ -17,7 +17,7 @@
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},
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{
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"cell_type": "code",
20-
"execution_count": null,
20+
"execution_count": 2,
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"metadata": {
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"collapsed": true
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},
@@ -29,25 +29,49 @@
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"execution_count": 3,
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"metadata": {
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"collapsed": false,
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"scrolled": true
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},
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"outputs": [],
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"outputs": [
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{
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"ename": "AssertionError",
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"evalue": "",
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"output_type": "error",
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"traceback": [
43+
"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
44+
"\u001b[0;31mAssertionError\u001b[0m Traceback (most recent call last)",
45+
"\u001b[0;32m<ipython-input-3-e5d2d9c5d319>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m 1\u001b[0m \u001b[0;31m# when the argument is false, an assertion error is raised\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 2\u001b[0;31m \u001b[0;32massert\u001b[0m \u001b[0;32mTrue\u001b[0m \u001b[0;34m==\u001b[0m \u001b[0;32mFalse\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
46+
"\u001b[0;31mAssertionError\u001b[0m: "
47+
]
48+
}
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],
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"source": [
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"# when the argument is false, an assertion error is raised\n",
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"assert True == False"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"execution_count": 4,
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"metadata": {
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"collapsed": false,
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"scrolled": true
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},
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"outputs": [],
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"outputs": [
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{
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"ename": "AssertionError",
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"evalue": "True is not False",
66+
"output_type": "error",
67+
"traceback": [
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"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
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"\u001b[0;31mAssertionError\u001b[0m Traceback (most recent call last)",
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"\u001b[0;32m<ipython-input-4-5c334bceab7f>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m 1\u001b[0m \u001b[0;31m# an error message can even be added to the assertion\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 2\u001b[0;31m \u001b[0;32massert\u001b[0m \u001b[0;32mTrue\u001b[0m \u001b[0;34m==\u001b[0m \u001b[0;32mFalse\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m\"True is not False\"\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
71+
"\u001b[0;31mAssertionError\u001b[0m: True is not False"
72+
]
73+
}
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],
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"source": [
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"# an error message can even be added to the assertion\n",
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"assert True == False, \"True is not False\""
@@ -64,11 +88,24 @@
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"execution_count": 5,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"outputs": [
96+
{
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"ename": "ZeroDivisionError",
98+
"evalue": "division by zero",
99+
"output_type": "error",
100+
"traceback": [
101+
"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
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"\u001b[0;31mZeroDivisionError\u001b[0m Traceback (most recent call last)",
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"\u001b[0;32m<ipython-input-5-78dbe8a12ddf>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m 2\u001b[0m \u001b[0;32mreturn\u001b[0m \u001b[0msum\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m/\u001b[0m\u001b[0mlen\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 3\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 4\u001b[0;31m \u001b[0mmean\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
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"\u001b[0;32m<ipython-input-5-78dbe8a12ddf>\u001b[0m in \u001b[0;36mmean\u001b[0;34m(num_list)\u001b[0m\n\u001b[1;32m 1\u001b[0m \u001b[0;32mdef\u001b[0m \u001b[0mmean\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 2\u001b[0;31m \u001b[0;32mreturn\u001b[0m \u001b[0msum\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m/\u001b[0m\u001b[0mlen\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m 3\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 4\u001b[0m \u001b[0mmean\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
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"\u001b[0;31mZeroDivisionError\u001b[0m: division by zero"
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]
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}
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],
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"source": [
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"def mean(num_list):\n",
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" return sum(num_list)/len(num_list)\n",
@@ -85,14 +122,27 @@
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},
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{
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"cell_type": "code",
88-
"execution_count": null,
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"execution_count": 6,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"outputs": [
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{
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"ename": "AssertionError",
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"evalue": "the input is empty but should be a list of numbers",
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"output_type": "error",
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"traceback": [
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"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
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"\u001b[0;31mAssertionError\u001b[0m Traceback (most recent call last)",
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"\u001b[0;32m<ipython-input-6-00b3a334fbad>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m 3\u001b[0m \u001b[0;32mreturn\u001b[0m \u001b[0msum\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m/\u001b[0m\u001b[0mlen\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 4\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 5\u001b[0;31m \u001b[0mmean\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
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"\u001b[0;32m<ipython-input-6-00b3a334fbad>\u001b[0m in \u001b[0;36mmean\u001b[0;34m(num_list)\u001b[0m\n\u001b[1;32m 1\u001b[0m \u001b[0;32mdef\u001b[0m \u001b[0mmean\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 2\u001b[0;31m \u001b[0;32massert\u001b[0m \u001b[0mlen\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m)\u001b[0m \u001b[0;34m!=\u001b[0m \u001b[0;36m0\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m\"the input is empty but should be a list of numbers\"\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m 3\u001b[0m \u001b[0;32mreturn\u001b[0m \u001b[0msum\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m/\u001b[0m\u001b[0mlen\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 4\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 5\u001b[0m \u001b[0mmean\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
139+
"\u001b[0;31mAssertionError\u001b[0m: the input is empty but should be a list of numbers"
140+
]
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}
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],
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"source": [
94144
"def mean(num_list):\n",
95-
" assert len(num_list) != 0, \"the input is empty\"\n",
145+
" assert len(num_list) != 0, \"the input is empty but should be a list of numbers\"\n",
96146
" return sum(num_list)/len(num_list)\n",
97147
"\n",
98148
"mean([])"
@@ -107,11 +157,24 @@
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"execution_count": 7,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"outputs": [
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{
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"ename": "TypeError",
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"evalue": "unsupported operand type(s) for +: 'int' and 'str'",
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"output_type": "error",
169+
"traceback": [
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"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
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"\u001b[0;31mTypeError\u001b[0m Traceback (most recent call last)",
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"\u001b[0;32m<ipython-input-7-b40137885f93>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mmean\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"nonempty-nonlist\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
173+
"\u001b[0;32m<ipython-input-6-00b3a334fbad>\u001b[0m in \u001b[0;36mmean\u001b[0;34m(num_list)\u001b[0m\n\u001b[1;32m 1\u001b[0m \u001b[0;32mdef\u001b[0m \u001b[0mmean\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 2\u001b[0m \u001b[0;32massert\u001b[0m \u001b[0mlen\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m)\u001b[0m \u001b[0;34m!=\u001b[0m \u001b[0;36m0\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m\"the input is empty but should be a list of numbers\"\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 3\u001b[0;31m \u001b[0;32mreturn\u001b[0m \u001b[0msum\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m/\u001b[0m\u001b[0mlen\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m 4\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 5\u001b[0m \u001b[0mmean\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
174+
"\u001b[0;31mTypeError\u001b[0m: unsupported operand type(s) for +: 'int' and 'str'"
175+
]
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}
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],
115178
"source": [
116179
"mean(\"nonempty-nonlist\")"
117180
]
@@ -127,49 +190,87 @@
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"execution_count": 8,
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"metadata": {
132195
"collapsed": false
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},
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"outputs": [],
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"source": [
136199
"def mean(num_list):\n",
137200
" assert len(num_list) != 0, \"the input is empty\"\n",
201+
" assert isinstance(num_list, list), \"the input must be a list\"\n",
138202
" # insert your assertion here\n",
139203
" return sum(num_list)/len(num_list)"
140204
]
141205
},
142206
{
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"cell_type": "code",
144-
"execution_count": null,
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"execution_count": 9,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"outputs": [
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{
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"data": {
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"text/plain": [
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"2.0"
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]
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},
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"execution_count": 9,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
149224
"source": [
150225
"# Does it give the right answer?\n",
151226
"mean([1,2,3])"
152227
]
153228
},
154229
{
155230
"cell_type": "code",
156-
"execution_count": null,
231+
"execution_count": 10,
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"metadata": {
158233
"collapsed": false
159234
},
160-
"outputs": [],
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"outputs": [
236+
{
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"ename": "AssertionError",
238+
"evalue": "the input must be a list",
239+
"output_type": "error",
240+
"traceback": [
241+
"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
242+
"\u001b[0;31mAssertionError\u001b[0m Traceback (most recent call last)",
243+
"\u001b[0;32m<ipython-input-10-97e4976488ed>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m 1\u001b[0m \u001b[0;31m# Does this cause it to halt with a type message?\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 2\u001b[0;31m \u001b[0mmean\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"test\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
244+
"\u001b[0;32m<ipython-input-8-95737c8c1621>\u001b[0m in \u001b[0;36mmean\u001b[0;34m(num_list)\u001b[0m\n\u001b[1;32m 1\u001b[0m \u001b[0;32mdef\u001b[0m \u001b[0mmean\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 2\u001b[0m \u001b[0;32massert\u001b[0m \u001b[0mlen\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m)\u001b[0m \u001b[0;34m!=\u001b[0m \u001b[0;36m0\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m\"the input is empty\"\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 3\u001b[0;31m \u001b[0;32massert\u001b[0m \u001b[0misinstance\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mlist\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m\"the input must be a list\"\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m 4\u001b[0m \u001b[0;31m# insert your assertion here\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 5\u001b[0m \u001b[0;32mreturn\u001b[0m \u001b[0msum\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m/\u001b[0m\u001b[0mlen\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
245+
"\u001b[0;31mAssertionError\u001b[0m: the input must be a list"
246+
]
247+
}
248+
],
161249
"source": [
162250
"# Does this cause it to halt with a type message?\n",
163251
"mean(\"test\")"
164252
]
165253
},
166254
{
167255
"cell_type": "code",
168-
"execution_count": null,
256+
"execution_count": 11,
169257
"metadata": {
170258
"collapsed": false
171259
},
172-
"outputs": [],
260+
"outputs": [
261+
{
262+
"ename": "AssertionError",
263+
"evalue": "the input is empty",
264+
"output_type": "error",
265+
"traceback": [
266+
"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
267+
"\u001b[0;31mAssertionError\u001b[0m Traceback (most recent call last)",
268+
"\u001b[0;32m<ipython-input-11-8f75ac94dc5e>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m 1\u001b[0m \u001b[0;31m# Does this cause it to halt with an emptiness message?\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 2\u001b[0;31m \u001b[0mmean\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
269+
"\u001b[0;32m<ipython-input-8-95737c8c1621>\u001b[0m in \u001b[0;36mmean\u001b[0;34m(num_list)\u001b[0m\n\u001b[1;32m 1\u001b[0m \u001b[0;32mdef\u001b[0m \u001b[0mmean\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 2\u001b[0;31m \u001b[0;32massert\u001b[0m \u001b[0mlen\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m)\u001b[0m \u001b[0;34m!=\u001b[0m \u001b[0;36m0\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m\"the input is empty\"\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m 3\u001b[0m \u001b[0;32massert\u001b[0m \u001b[0misinstance\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mlist\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m\"the input must be a list\"\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 4\u001b[0m \u001b[0;31m# insert your assertion here\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 5\u001b[0m \u001b[0;32mreturn\u001b[0m \u001b[0msum\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m/\u001b[0m\u001b[0mlen\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum_list\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
270+
"\u001b[0;31mAssertionError\u001b[0m: the input is empty"
271+
]
272+
}
273+
],
173274
"source": [
174275
"# Does this cause it to halt with an emptiness message?\n",
175276
"mean([])"
@@ -193,16 +294,18 @@
193294
},
194295
{
195296
"cell_type": "code",
196-
"execution_count": null,
297+
"execution_count": 13,
197298
"metadata": {
198299
"collapsed": false
199300
},
200301
"outputs": [],
201302
"source": [
202303
"from mynum import a\n",
203-
"# a is greater than 2 assertion here\n",
304+
"# a is greater or equal to 2 assertion here\n",
305+
"assert a >= 2\n",
204306
"# a is within 2 decimal places of 2 assertion here\n",
205-
"# a is within 0.003 of 2 assertion here"
307+
"assert \n",
308+
"# a is within 0.003 of 2 assertion here\n"
206309
]
207310
},
208311
{

‎mynum.py‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1 @@
1+
a = 401.0/200.0

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