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AllenDowneyAllenDowney
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Updating the notebooks
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‎chapters/chap13.ipynb‎

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{
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"cell_type": "markdown",
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"id": "85844afb",
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"metadata": {
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"tags": []
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},
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"metadata": {},
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"source": [
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"Here's an outline of the function to get you started."
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"metadata": {},
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"outputs": [],
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"source": [
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"# Solution goes here"
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"def replace_all(old, new, source_path, dest_path):\n",
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" # read the contents of the source file\n",
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" # replace the old string with the new\n",
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" # write the result into the destination file"
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]
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},
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{

‎chapters/chap14.ipynb‎

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"metadata": {},
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"source": [
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"It might be surprising that the parameters have the same names as the attributes, but that's a common way to write a function like this.\n",
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"Here's how we use `make_time` to create a `Time` object.`"
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"Here's how we use `make_time` to create a `Time` object."
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{
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"metadata": {},
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"source": [
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"The result is the number of seconds since the beginning of the day.\n",
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"For example, `01:01:01` is `1` hour, `1` minute and `1` second from the beginning of the day, with is the sum of `3600` seconds, `60` seconds, and `1` second."
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"For example, `01:01:01` is `1` hour, `1` minute and `1` second from the beginning of the day, which is the sum of `3600` seconds, `60` seconds, and `1` second."
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]
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{
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"Also, in this chapter we saw one example of a format specifier. For more information, ask \"What format specifiers can be used in a Python f-string?\""
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]
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},
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{
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"cell_type": "markdown",
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"id": "c85eab62",
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"metadata": {},
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"source": [
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"## Exercises\n"
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]
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},
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{
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"cell_type": "markdown",
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"id": "bcdab7d6",

‎chapters/chap15.ipynb‎

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"\n",
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"2. Write an `__init__` method that takes `year`, `month`, and `day` as parameters and assigns the parameters to attributes. Create an object that represents June 22, 1933.\n",
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"\n",
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"2. Write `__str__` method that uses an f-string to format the attributes and returns the result. If you test it with the `Date` you created, the result should be `1933-06-22`.\n",
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"3. Write `__str__` method that uses an f-string to format the attributes and returns the result. If you test it with the `Date` you created, the result should be `1933-06-22`.\n",
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"\n",
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"3. Write a method called `is_after` that takes two `Date` objects and returns `True` if the first comes after the second. Create a second object that represents September 17, 1933, and check whether it comes after the first object.\n",
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"4. Write a method called `is_after` that takes two `Date` objects and returns `True` if the first comes after the second. Create a second object that represents September 17, 1933, and check whether it comes after the first object.\n",
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"\n",
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"Hint: You might find it useful write a method called `to_tuple` that returns a tuple that contains the attributes of a `Date` object in year-month-day order."
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]

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