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Mostly cleaning up instructions
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‎Week_0_python/a_tutorial_strings_format.ipynb‎

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‎Week_0_python/b_tutorial_strings_edit_search.ipynb‎

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@@ -23,7 +23,7 @@
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"metadata": {},
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"source": [
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"## Example: Editing a string\n",
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"SOUNDS LIKE I'M YELLING! to Sounds like I'm NOT yelling\n",
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"Goal: convert \"SOUNDS LIKE I'M YELLING!\" to \"Sounds like I'm NOT yelling\"\n",
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"\n",
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"Problem break down:\n",
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"- First do the conversion to lower case\n",
@@ -32,12 +32,15 @@
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"- Next, stick in a \"not\"\n",
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"- Next, take the ! out\n",
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"\n",
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"Obviously, if I knew what the sentence was it would be a lot easier to just, well, make the new sentence... But imagine, instead, you're writing a general purpose routine to convert all-caps strings to lower-case ones..."
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"Obviously, if I knew what the sentence was it would be a lot easier to just, well, make the new sentence... But imagine, instead, you're writing a general purpose routine to convert all-caps strings to lower-case ones and fix grammar errors...\n",
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"\n",
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"TODO\n",
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"- Try taking out all of the spaces"
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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": 1,
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
@@ -47,17 +50,9 @@
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},
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{
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"cell_type": "code",
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"execution_count": 2,
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"execution_count": null,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"This is yelling: SOUNDS LIKE I'M YELLING!, this is not: sounds like i'm yelling!\n"
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]
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}
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],
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"outputs": [],
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"source": [
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"# convert to lower case - lower makes a copy of the string, converts the upper case letters, then returns the copy\n",
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"my_string_lower_case = my_string_upper_case.lower()\n",
@@ -68,36 +63,20 @@
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},
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{
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"cell_type": "code",
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"execution_count": 3,
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"execution_count": null,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Sounds like i'm yelling!\n"
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]
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}
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],
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"outputs": [],
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"source": [
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"# Oops, should capitalize first letter:\n",
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"# Oops, should capitalize first letter - note capitalize, and not upper:\n",
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"my_string_cap = my_string_lower_case.capitalize()\n",
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"print(my_string_cap)"
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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": 4,
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"execution_count": null,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Sounds like I'm yelling!\n"
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]
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}
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],
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"outputs": [],
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"source": [
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"# ... and replace the lower-case i with an upper case\n",
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"# Notice the use of \"\" so that we can use ' as a character\n",
@@ -107,17 +86,9 @@
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},
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{
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"cell_type": "code",
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"execution_count": 5,
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"execution_count": null,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Sounds like I'm not yelling!\n"
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]
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}
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],
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"outputs": [],
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"source": [
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"# add in the \"not\" by finding the last space\n",
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"index_last_space = my_string_with_i_fixed.rfind(\" \")\n",
@@ -130,23 +101,22 @@
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},
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{
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"cell_type": "code",
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"execution_count": 6,
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"execution_count": null,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Sounds like I'm not yelling\n"
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]
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}
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],
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"outputs": [],
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"source": [
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"# ... without the ! at the end - use :-1 to only copy up to the last element\n",
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"my_not_yelling_string_better = my_string_with_i_fixed[0:index_last_space] + \" not\" + my_string_with_i_fixed[index_last_space:-1]\n",
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"print(my_not_yelling_string_better)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"... Yes, you can do all of that editing in one line of really confusing Python. Just don't. BUT, you might try combining two steps at the same time..."
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
@@ -160,21 +130,9 @@
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},
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{
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"cell_type": "code",
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"execution_count": 7,
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"execution_count": null,
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"metadata": {},
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"outputs": [
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{
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"ename": "TypeError",
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"evalue": "'str' object does not support item assignment",
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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;31mTypeError\u001b[0m Traceback (most recent call last)",
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"\u001b[0;32m<ipython-input-7-a8cfd7393bb6>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mmy_not_yelling_string\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;36m1\u001b[0m\u001b[0;34m]\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;34m's'\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
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"\u001b[0;31mTypeError\u001b[0m: 'str' object does not support item assignment"
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]
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}
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],
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"outputs": [],
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"source": [
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"my_not_yelling_string[1] = 's'"
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]
@@ -189,7 +147,11 @@
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"\n",
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"For these examples we'll have pre-defined strings that are \"typed in\" (rather than reading them from a file) just to keep things simple. In reality, you usually have to do this when you can't edit the files directly.\n",
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"\n",
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"An aside: When you only have one file you're \"cleaning up\" for processing (as opposed to writing some code to process a whole bunch of similar files) it is often a lot easier to open the file in your favorite spreadsheet editor and just... edit it there. "
150+
"An aside: When you only have one file you're \"cleaning up\" for processing (as opposed to writing some code to process a whole bunch of similar files) it is often a lot easier to open the file in your favorite spreadsheet editor and just... edit it there. \n",
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"\n",
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"TODO:\n",
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"- Create a string with semi-colons separating the values\n",
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"- Use split to pull it apart into a list of numbers"
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]
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},
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{
@@ -202,17 +164,9 @@
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},
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{
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"cell_type": "code",
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"execution_count": 8,
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"execution_count": null,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"\t0.3, 0.4, 0.5, 3., 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2\n"
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]
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}
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],
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"outputs": [],
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"source": [
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"# Make a list of numbers\n",
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"list_of_numbers = [0.3 + 0.1 * n for n in range(0, 10)]\n",
@@ -226,17 +180,9 @@
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},
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{
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"cell_type": "code",
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"execution_count": 9,
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"execution_count": null,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"[0.3, 0.4, 0.5, 3.0, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2]\n"
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]
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}
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],
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"outputs": [],
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"source": [
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"# Take it back apart again using split, looking for commans\n",
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"my_list_back_as_strs = str_list_of_numbers.split(',')\n",
@@ -248,7 +194,7 @@
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},
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{
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"cell_type": "code",
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"execution_count": 10,
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
@@ -267,44 +213,28 @@
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"We have a list of strings, which consist of a descriptive name followed by a colon followed by a number\n",
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" - Find the end of the line (the \\n) then split up each line.\n",
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" - If the line has a : then get out the number, otherwise, ignore it\n",
270-
" - Note that there is a more complete example of this (for building a dictionary) in the dictionary tutorial"
216+
" - Note that there is a more complete example of this (for building a dictionary) in the dictionary tutorial\n",
217+
" \n",
218+
"TODO\n",
219+
"- Try printing out which item it is when you find one\n",
220+
"- To test it, reverse the order in the string and see if it still works"
271221
]
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},
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{
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"cell_type": "code",
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"execution_count": 12,
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"execution_count": null,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"# This is a header\n",
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"Item 1: 0.3\n",
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"Blank line\n",
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"Item 2: 1.3\n",
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"\n"
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]
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}
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],
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"outputs": [],
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"source": [
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"my_str_to_parse = \"# This is a header\\nItem 1: 0.3\\nBlank line\\nItem 2: 1.3\\n\"\n",
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"print(my_str_to_parse)"
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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": 14,
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"execution_count": null,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"['# This is a header', 'Item 1: 0.3', 'Blank line', 'Item 2: 1.3', '']\n"
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]
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}
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],
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"outputs": [],
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"source": [
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"# First, split the line into strings separated by \\n\n",
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"my_lines = my_str_to_parse.split('\\n')\n",
@@ -313,17 +243,9 @@
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},
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{
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"cell_type": "code",
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"execution_count": 15,
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"execution_count": null,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"[0.3, 1.3]\n"
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]
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}
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],
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"outputs": [],
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"source": [
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"# An empty list of numbers\n",
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"my_numbers = []\n",
@@ -334,6 +256,7 @@
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" # split again - you could also use find and the resulting index\n",
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" two_parts = l.split(\":\")\n",
336258
" # Don't forget to convert the string to the number\n",
259+
" #. the [-1] is to get the last (second) element in the list\n",
337260
" the_number = float(two_parts[-1])\n",
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" my_numbers.append(the_number)\n",
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"print(my_numbers)"
@@ -344,22 +267,14 @@
344267
"metadata": {},
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"source": [
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"## Tutorial: Editing a file name\n",
347-
"This is pretty common - take the last 4 characters off and replace them with a different file type"
270+
"This is pretty common - take the last 4 characters off and replace them with a different file type. Try changing .txt to .py and edit the second line to do the right thing."
348271
]
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},
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{
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"cell_type": "code",
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"execution_count": 17,
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"execution_count": null,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"my_file.csv\n"
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]
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}
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],
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"outputs": [],
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"source": [
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"file_name_orig = \"my_file.txt\"\n",
365280
"file_name_new = file_name_orig[0:-4] + \".csv\"\n",

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