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notes from class, RWET 2018-02-09
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notes-2018-02-09.ipynb
{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Notes 2018-02-09\n",
"\n",
"### the difference between printing a string and evaluating it!"
]
},
{
"cell_type": "code",
"execution_count": 1,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'hello'"
]
},
"execution_count": 1,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"\"hello\""
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"hello\n"
]
}
],
"source": [
"print(\"hello\")"
]
},
{
"cell_type": "code",
"execution_count": 4,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"46"
]
},
"execution_count": 4,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"6 / 4\n",
"1 + 1\n",
"\"hello\"\n",
"\"there\"\n",
"12 + 34"
]
},
{
"cell_type": "code",
"execution_count": 7,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"hello\n",
"there\n"
]
}
],
"source": [
"print(\"hello\")\n",
"print(\"there\")"
]
},
{
"cell_type": "code",
"execution_count": 8,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'hello\\nthere'"
]
},
"execution_count": 8,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"\"hello\\nthere\""
]
},
{
"cell_type": "code",
"execution_count": 10,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"hello\n",
"there\n"
]
}
],
"source": [
"print(\"hello\\nthere\")"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### asking questions about strings!\n",
"\n",
"Here's how to do things with strings!"
]
},
{
"cell_type": "code",
"execution_count": 12,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"14"
]
},
"execution_count": 12,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"len(\"This is a test\")"
]
},
{
"cell_type": "code",
"execution_count": 14,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"6"
]
},
"execution_count": 14,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"len(\"hello😀\")"
]
},
{
"cell_type": "code",
"execution_count": 15,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"9"
]
},
"execution_count": 15,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"len(\"three\") + len(\"four\")"
]
},
{
"cell_type": "code",
"execution_count": 16,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"True"
]
},
"execution_count": 16,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"len(\"kitten\") > 5"
]
},
{
"cell_type": "code",
"execution_count": 17,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"int"
]
},
"execution_count": 17,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"type(len(\"kitten\"))"
]
},
{
"cell_type": "code",
"execution_count": 18,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"True"
]
},
"execution_count": 18,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"\"foo\" in \"buffoon\""
]
},
{
"cell_type": "code",
"execution_count": 19,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"False"
]
},
"execution_count": 19,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"\"foo\" in \"reginald\""
]
},
{
"cell_type": "code",
"execution_count": 20,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"x = \"foo\"\n",
"y = \"buffoon\""
]
},
{
"cell_type": "code",
"execution_count": 21,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"True"
]
},
"execution_count": 21,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"x in y"
]
},
{
"cell_type": "code",
"execution_count": 22,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"message = \"foodie\""
]
},
{
"cell_type": "code",
"execution_count": 23,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"True"
]
},
"execution_count": 23,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message.startswith(\"foo\")"
]
},
{
"cell_type": "code",
"execution_count": 24,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"False"
]
},
"execution_count": 24,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message.startswith(\"z\")"
]
},
{
"cell_type": "code",
"execution_count": 26,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"True"
]
},
"execution_count": 26,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message.endswith(\"ie\")"
]
},
{
"cell_type": "code",
"execution_count": 28,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"True"
]
},
"execution_count": 28,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"\"howdy\".startswith(\"how\")"
]
},
{
"cell_type": "code",
"execution_count": 29,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"False"
]
},
"execution_count": 29,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"\"howdy\".isdigit()"
]
},
{
"cell_type": "code",
"execution_count": 30,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"True"
]
},
"execution_count": 30,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"\"124\".isdigit()"
]
},
{
"cell_type": "code",
"execution_count": 31,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"False"
]
},
"execution_count": 31,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"\"howdy1\".isdigit()"
]
},
{
"cell_type": "code",
"execution_count": 32,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'foodie'"
]
},
"execution_count": 32,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message"
]
},
{
"cell_type": "code",
"execution_count": 33,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"message = \"Now is the winter of our discontent\""
]
},
{
"cell_type": "code",
"execution_count": 35,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"28"
]
},
"execution_count": 35,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message.find(\"content\")"
]
},
{
"cell_type": "code",
"execution_count": 44,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"-1"
]
},
"execution_count": 44,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message.find(\"now\")"
]
},
{
"cell_type": "code",
"execution_count": 45,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"0"
]
},
"execution_count": 45,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message.find(\"Now\")"
]
},
{
"cell_type": "code",
"execution_count": 37,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"7"
]
},
"execution_count": 37,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message.find(\"t\")"
]
},
{
"cell_type": "code",
"execution_count": 38,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"False"
]
},
"execution_count": 38,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"5 == 4"
]
},
{
"cell_type": "code",
"execution_count": 39,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"True"
]
},
"execution_count": 39,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"5 == 3 + 2"
]
},
{
"cell_type": "code",
"execution_count": 40,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"True"
]
},
"execution_count": 40,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"\"pants\" == \"pants\""
]
},
{
"cell_type": "code",
"execution_count": 41,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'foo'"
]
},
"execution_count": 41,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"x"
]
},
{
"cell_type": "code",
"execution_count": 42,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"True"
]
},
"execution_count": 42,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"x == \"foo\""
]
},
{
"cell_type": "code",
"execution_count": 46,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"False"
]
},
"execution_count": 46,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"x == \"FOO\""
]
},
{
"cell_type": "code",
"execution_count": 47,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"True"
]
},
"execution_count": 47,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"x == \"FOO\".lower()"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### simple string transformations!"
]
},
{
"cell_type": "code",
"execution_count": 48,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"yelling = \"THIS IS UNACCEPTABLE!\""
]
},
{
"cell_type": "code",
"execution_count": 49,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'this is unacceptable!'"
]
},
"execution_count": 49,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"yelling.lower()"
]
},
{
"cell_type": "code",
"execution_count": 50,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"this is unacceptable!\n"
]
}
],
"source": [
"print(yelling.lower())"
]
},
{
"cell_type": "code",
"execution_count": 51,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'E. E. CUMMINGS IS NOT HAPPY ABOUT THIS.'"
]
},
"execution_count": 51,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"\"e. e. cummings is not happy about this.\".upper()"
]
},
{
"cell_type": "code",
"execution_count": 52,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"message = \" it has a bunch of spaces at the beginning and end \""
]
},
{
"cell_type": "code",
"execution_count": 53,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'it has a bunch of spaces at the beginning and end'"
]
},
"execution_count": 53,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message.strip()"
]
},
{
"cell_type": "code",
"execution_count": 54,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"song = \"I got rhythm, I got music, I got my man, who could ask for anything more\""
]
},
{
"cell_type": "code",
"execution_count": 55,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'I got rhythm, I got music, I got my man, who could ask for anything more'"
]
},
"execution_count": 55,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"song"
]
},
{
"cell_type": "code",
"execution_count": 56,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'your humble narrator got rhythm, your humble narrator got music, your humble narrator got my man, who could ask for anything more'"
]
},
"execution_count": 56,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"song.replace(\"I\", \"your humble narrator\")"
]
},
{
"cell_type": "code",
"execution_count": 57,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'I got rhythm, I got music, I got my man, who could ask for anything more'"
]
},
"execution_count": 57,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"song"
]
},
{
"cell_type": "code",
"execution_count": 58,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"\"I don't have rhythm, I don't have music, I don't have my man, who could ask for anything more\""
]
},
"execution_count": 58,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"song.replace(\"got\", \"don't have\")"
]
},
{
"cell_type": "code",
"execution_count": 59,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"\"I DON'T HAVE RHYTHM, I DON'T HAVE MUSIC, I DON'T HAVE MY MAN, WHO COULD ASK FOR ANYTHING MORE\""
]
},
"execution_count": 59,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"song.replace(\"got\", \"don't have\").upper()"
]
},
{
"cell_type": "code",
"execution_count": 60,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"\"I DON'T HAVE RHYTHM, I DON'T HAVE MUSIC, I DON'T HAVE MY MAN, WHO COULD ASK FOR ANYTHING LESS\""
]
},
"execution_count": 60,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"song.replace(\"got\", \"don't have\").replace(\"more\", \"less\").upper()"
]
},
{
"cell_type": "code",
"execution_count": 61,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"hello\n"
]
}
],
"source": [
"print(\"hello\")"
]
},
{
"cell_type": "code",
"execution_count": 62,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"hello\n"
]
},
{
"data": {
"text/plain": [
"NoneType"
]
},
"execution_count": 62,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"type(print(\"hello\"))"
]
},
{
"cell_type": "code",
"execution_count": 63,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"I DON'T HAVE RHYTHM, I DON'T HAVE MUSIC, I DON'T HAVE MY MAN, WHO COULD ASK FOR ANYTHING LESS\n"
]
}
],
"source": [
"print(song.replace(\"got\", \"don't have\").replace(\"more\", \"less\").upper())"
]
},
{
"cell_type": "code",
"execution_count": 64,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"17\n"
]
}
],
"source": [
"print(17)"
]
},
{
"cell_type": "code",
"execution_count": 65,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"115\n"
]
}
],
"source": [
"print(15 + 100)"
]
},
{
"cell_type": "code",
"execution_count": 66,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"hello\n"
]
}
],
"source": [
"print(\"hello\")"
]
},
{
"cell_type": "code",
"execution_count": 67,
"metadata": {
"scrolled": true
},
"outputs": [
{
"data": {
"text/plain": [
"5"
]
},
"execution_count": 67,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"len(\"hello\")"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"to open your finder to the directory of this notebook:"
]
},
{
"cell_type": "code",
"execution_count": 68,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"!open ."
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Working with text files"
]
},
{
"cell_type": "code",
"execution_count": 71,
"metadata": {},
"outputs": [],
"source": [
"text = open(\"sea_rose.txt\").read()"
]
},
{
"cell_type": "code",
"execution_count": 72,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'Rose, harsh rose, \\nmarred and with stint of petals, \\nmeagre flower, thin, \\nspare of leaf,\\n\\nmore precious \\nthan a wet rose \\nsingle on a stem -- \\nyou are caught in the drift.\\n\\nStunted, with small leaf, \\nyou are flung on the sand, \\nyou are lifted \\nin the crisp sand \\nthat drives in the wind.\\n\\nCan the spice-rose \\ndrip such acrid fragrance \\nhardened in a leaf?\\n'"
]
},
"execution_count": 72,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"text"
]
},
{
"cell_type": "code",
"execution_count": 73,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Rose, harsh rose, \n",
"marred and with stint of petals, \n",
"meagre flower, thin, \n",
"spare of leaf,\n",
"\n",
"more precious \n",
"than a wet rose \n",
"single on a stem -- \n",
"you are caught in the drift.\n",
"\n",
"Stunted, with small leaf, \n",
"you are flung on the sand, \n",
"you are lifted \n",
"in the crisp sand \n",
"that drives in the wind.\n",
"\n",
"Can the spice-rose \n",
"drip such acrid fragrance \n",
"hardened in a leaf?\n",
"\n"
]
}
],
"source": [
"print(text)"
]
},
{
"cell_type": "code",
"execution_count": 74,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"357"
]
},
"execution_count": 74,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"len(text)"
]
},
{
"cell_type": "code",
"execution_count": 76,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"338"
]
},
"execution_count": 76,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"len(text.replace(\"\\n\", \"\"))"
]
},
{
"cell_type": "code",
"execution_count": 79,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Rose, haaaaarsh rose, \n",
"maaaaarred aaaaand with stint of petaaaaals, \n",
"meaaaaagre flower, thin, \n",
"spaaaaare of leaaaaaf,\n",
"\n",
"more precious \n",
"thaaaaan aaaaa wet rose \n",
"single on aaaaa stem -- \n",
"you aaaaare caaaaaught in the drift.\n",
"\n",
"Stunted, with smaaaaall leaaaaaf, \n",
"you aaaaare flung on the saaaaand, \n",
"you aaaaare lifted \n",
"in the crisp saaaaand \n",
"thaaaaat drives in the wind.\n",
"\n",
"Caaaaan the spice-rose \n",
"drip such aaaaacrid fraaaaagraaaaance \n",
"haaaaardened in aaaaa leaaaaaf?\n",
"\n"
]
}
],
"source": [
"print(text.replace(\"a\", \"aaaaa\"))"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"in case you can't help but care about fonts:"
]
},
{
"cell_type": "code",
"execution_count": 80,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"<div style='font-family: Comic Sans MS'>Rose, harsh rose, \n",
"marred and with stint of petals, \n",
"meagre flower, thin, \n",
"spare of leaf,\n",
"\n",
"more precious \n",
"than a wet rose \n",
"single on a stem -- \n",
"you are caught in the drift.\n",
"\n",
"Stunted, with small leaf, \n",
"you are flung on the sand, \n",
"you are lifted \n",
"in the crisp sand \n",
"that drives in the wind.\n",
"\n",
"Can the spice-rose \n",
"drip such acrid fragrance \n",
"hardened in a leaf?\n",
"</div>\n"
]
}
],
"source": [
"print(\"<div style='font-family: Comic Sans MS'>\" + text + \"</div>\")"
]
},
{
"cell_type": "code",
"execution_count": 81,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"ROSE, HARSH ROSE, \n",
"MARRED AND WITH STINT OF PETALS, \n",
"MEAGRE FLOWER, THIN, \n",
"SPARE OF LEAF,\n",
"\n",
"MORE PRECIOUS \n",
"THAN A WET ROSE \n",
"SINGLE ON A STEM -- \n",
"YOU ARE CAUGHT IN THE DRIFT.\n",
"\n",
"STUNTED, WITH SMALL LEAF, \n",
"YOU ARE FLUNG ON THE SAND, \n",
"YOU ARE LIFTED \n",
"IN THE CRISP SAND \n",
"THAT DRIVES IN THE WIND.\n",
"\n",
"CAN THE SPICE-ROSE \n",
"DRIP SUCH ACRID FRAGRANCE \n",
"HARDENED IN A LEAF?\n",
"\n"
]
}
],
"source": [
"print(text.upper())"
]
},
{
"cell_type": "code",
"execution_count": 83,
"metadata": {
"scrolled": true
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Rose, harsh rose, \n",
"marred and with stint of petals, \n",
"meagre flower, thin, \n",
"spare of leaf,\n",
"\n",
"more precious \n",
"than a wet rose \n",
"single on a stem -- \n",
"you are caught in the drift.\n",
"\n",
"Stunted, with small leaf, \n",
"you are flung on the sand, \n",
"you are lifted \n",
"in the crisp sand \n",
"that drives in the wind.\n",
"\n",
"Can the spice-rose \n",
"drip such acrid fragrance \n",
"hardened in a leaf?\n",
"\n"
]
}
],
"source": [
"print(text.replace(\" \", \" \"))"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"writing out to a text file:"
]
},
{
"cell_type": "code",
"execution_count": 84,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"new_good_poem = text.replace(\" \", \" \")"
]
},
{
"cell_type": "code",
"execution_count": 85,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"540"
]
},
"execution_count": 85,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"open(\"new_good_poem.txt\", \"w\").write(new_good_poem)"
]
},
{
"cell_type": "code",
"execution_count": 86,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Rosö, hörsh rosö, \n",
"mörröd önd wöth stönt of pötöls, \n",
"möögrö flowör, thön, \n",
"spörö of lööf,\n",
"\n",
"morö pröcöous \n",
"thön ö wöt rosö \n",
"sönglö on ö stöm -- \n",
"you örö cöught ön thö dröft.\n",
"\n",
"Stuntöd, wöth smöll lööf, \n",
"you örö flung on thö sönd, \n",
"you örö löftöd \n",
"ön thö crösp sönd \n",
"thöt drövös ön thö wönd.\n",
"\n",
"Cön thö spöcö-rosö \n",
"dröp such öcröd frögröncö \n",
"hördönöd ön ö lööf?\n",
"\n"
]
}
],
"source": [
"print(text.replace(\"a\", \"ö\").replace(\"e\", \"ö\").replace(\"i\", \"ö\"))"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## string indexing and string slices"
]
},
{
"cell_type": "code",
"execution_count": 90,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"message = \"broadway\""
]
},
{
"cell_type": "code",
"execution_count": 91,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'d'"
]
},
"execution_count": 91,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message[4]"
]
},
{
"cell_type": "code",
"execution_count": 92,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'a'"
]
},
"execution_count": 92,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"i = 6\n",
"message[i]"
]
},
{
"cell_type": "code",
"execution_count": 93,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'d'"
]
},
"execution_count": 93,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message[i-2]"
]
},
{
"cell_type": "code",
"execution_count": 95,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'d'"
]
},
"execution_count": 95,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"\"howdy\"[3]"
]
},
{
"cell_type": "code",
"execution_count": 98,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"str"
]
},
"execution_count": 98,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"type(message[7])"
]
},
{
"cell_type": "code",
"execution_count": 97,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'b'"
]
},
"execution_count": 97,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message[0]"
]
},
{
"cell_type": "code",
"execution_count": 99,
"metadata": {},
"outputs": [
{
"ename": "IndexError",
"evalue": "string index out of range",
"output_type": "error",
"traceback": [
"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
"\u001b[0;31mIndexError\u001b[0m Traceback (most recent call last)",
"\u001b[0;32m<ipython-input-99-58216cf19efe>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mmessage\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;36m17\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
"\u001b[0;31mIndexError\u001b[0m: string index out of range"
]
}
],
"source": [
"message[17]"
]
},
{
"cell_type": "code",
"execution_count": 100,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'a'"
]
},
"execution_count": 100,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message[-2]"
]
},
{
"cell_type": "code",
"execution_count": 101,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'broadway'"
]
},
"execution_count": 101,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message"
]
},
{
"cell_type": "code",
"execution_count": 102,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'oad'"
]
},
"execution_count": 102,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message[2:5]"
]
},
{
"cell_type": "code",
"execution_count": 103,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'broa'"
]
},
"execution_count": 103,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message[0:4]"
]
},
{
"cell_type": "code",
"execution_count": 104,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'dwa'"
]
},
"execution_count": 104,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message[4:7]"
]
},
{
"cell_type": "code",
"execution_count": 105,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'broa'"
]
},
"execution_count": 105,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message[0:4]"
]
},
{
"cell_type": "code",
"execution_count": 106,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'broa'"
]
},
"execution_count": 106,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message[:4]"
]
},
{
"cell_type": "code",
"execution_count": 107,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'way'"
]
},
"execution_count": 107,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message[5:]"
]
},
{
"cell_type": "code",
"execution_count": 108,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'broad'"
]
},
"execution_count": 108,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message[:5]"
]
},
{
"cell_type": "code",
"execution_count": 109,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'adway'"
]
},
"execution_count": 109,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message[-5:]"
]
},
{
"cell_type": "code",
"execution_count": 110,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'adw'"
]
},
"execution_count": 110,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message[-5:-2]"
]
},
{
"cell_type": "code",
"execution_count": 111,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"''"
]
},
"execution_count": 111,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message[-2:-5]"
]
},
{
"cell_type": "code",
"execution_count": 112,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'broadway'"
]
},
"execution_count": 112,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"message[:]"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### concatenating strings"
]
},
{
"cell_type": "code",
"execution_count": 113,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'helloworld'"
]
},
"execution_count": 113,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"\"hello\" + \"world\""
]
},
{
"cell_type": "code",
"execution_count": 116,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'blahwhateverughgeezcheesecake'"
]
},
"execution_count": 116,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"x = \"blah\"\n",
"y = \"whatever\"\n",
"z = \"ugh\"\n",
"a = \"geez\"\n",
"b = \"cheesecake\"\n",
"x + y + z + a + b"
]
},
{
"cell_type": "code",
"execution_count": 117,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'1981'"
]
},
"execution_count": 117,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"\"19\" + \"81\""
]
},
{
"cell_type": "code",
"execution_count": 118,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"100"
]
},
"execution_count": 118,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"19 + 81"
]
},
{
"cell_type": "code",
"execution_count": 119,
"metadata": {},
"outputs": [
{
"ename": "TypeError",
"evalue": "unsupported operand type(s) for +: 'int' and 'str'",
"output_type": "error",
"traceback": [
"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
"\u001b[0;31mTypeError\u001b[0m Traceback (most recent call last)",
"\u001b[0;32m<ipython-input-119-2b78fcf187e5>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0;36m19\u001b[0m \u001b[0;34m+\u001b[0m \u001b[0;34m\"81\"\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
"\u001b[0;31mTypeError\u001b[0m: unsupported operand type(s) for +: 'int' and 'str'"
]
}
],
"source": [
"19 + \"81\""
]
},
{
"cell_type": "code",
"execution_count": 120,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"81"
]
},
"execution_count": 120,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"int(\"81\")"
]
},
{
"cell_type": "code",
"execution_count": 121,
"metadata": {},
"outputs": [
{
"ename": "ValueError",
"evalue": "invalid literal for int() with base 10: 'asdfasdfasdfasdf'",
"output_type": "error",
"traceback": [
"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
"\u001b[0;31mValueError\u001b[0m Traceback (most recent call last)",
"\u001b[0;32m<ipython-input-121-19f5fc74eb90>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"asdfasdfasdfasdf\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
"\u001b[0;31mValueError\u001b[0m: invalid literal for int() with base 10: 'asdfasdfasdfasdf'"
]
}
],
"source": [
"int(\"asdfasdfasdfasdf\")"
]
},
{
"cell_type": "code",
"execution_count": 122,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"'Rose, harsh rose, \\nmarred and with stint of petals, \\nmeagre flower, thin, \\nspare of leaf,\\n\\nmore precious \\nthan a wet rose \\nsingle on a stem -- \\nyou are caught in the drift.\\n\\nStunted, with small leaf, \\nyou are flung on the sand, \\nyou are lifted \\nin the crisp sand \\nthat drives in the wind.\\n\\nCan the spice-rose \\ndrip such acrid fragrance \\nhardened in a leaf?\\n'"
]
},
"execution_count": 122,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"text"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"how to do this?! with one expression?!?!?!?!\n",
"\n",
" Rose, harsh rose,\n",
" marred and with\n",
" uch acrid fragrance\n",
" hardened in a leaf?"
]
},
{
"cell_type": "code",
"execution_count": 130,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Rose, harsh rose, \n",
"marred and with crid fragrance \n",
"hardened in a leaf?\n",
"\n"
]
}
],
"source": [
"print(text[:int(len(text)*0.1)] + text[int(len(text)*0.9):])"
]
},
{
"cell_type": "code",
"execution_count": 125,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"35"
]
},
"execution_count": 125,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"int(len(text)*0.1)"
]
},
{
"cell_type": "code",
"execution_count": 124,
"metadata": {},
"outputs": [
{
"ename": "TypeError",
"evalue": "string indices must be integers",
"output_type": "error",
"traceback": [
"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
"\u001b[0;31mTypeError\u001b[0m Traceback (most recent call last)",
"\u001b[0;32m<ipython-input-124-201269be6b2b>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mtext\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;36m35.7\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
"\u001b[0;31mTypeError\u001b[0m: string indices must be integers"
]
}
],
"source": [
"text[35.7]"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": []
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3",
"language": "python",
"name": "python3"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 3
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.6.1"
}
},
"nbformat": 4,
"nbformat_minor": 2
}
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