Errata

Currently reads:
"... did your actually mention a planet"

Should read:
"... did you actually mention a planet"

Note from the Author or Editor:
Confirmed for Early Release material. Taken out of the printed book after Tech Review.

I’m taking about…
should be: I'm talking about…

Note from the Author or Editor:
Change "taking" to "talking" near start paragraph eight, left-hand column of this page.

Last sentence of this paragraph should start with "It is always a pleasure... " (the "is" is missing from the current sentence).

Extra "t" at start of sentence. Please remove.

Note from the Author or Editor:
(Typo by me on left - sigh, sorry). Should read LAST para, second sentence: Extra "t" at start of sentence. Please remove.

"expect" should say "except"

Note from the Author or Editor:
Change "expect" to "except" on last bullet point, left-hand-side.

Current text says:
Mara: I like that idea, as all the tools we’re using a free. What’s not to like?

Correct text should say:
Mara: I like that idea, as all the tools we’re using are free. What’s not to like?

Note from the Author or Editor:
Not an issue in the published book as this CC has been removed.

Hello,
I read this book on oreilly.com.
Figure 6-48.
[false]
<title>Welcome to the Swinclub system</title>
[true]
<title>Welcome to the Swimclub system</title>

swin-->swim club

Note from the Author or Editor:
Fixed during Tech Review.

Hello,
I read this book on oreilly.com.
Go ahead and add your new function to your app.py file (above the dunder name if statement). Your new code should match what’s shown here:

[false]
@app. get ("/ swimmers")
[true]
@app.get ("/swimmers")

"/ swimmers" --> "/swimmers" It's different as a path.

Note from the Author or Editor:
Not an issue in the final (printed) book. A conversion error during Early Release.

Hello,
I read this book on oreilly.com.
Figure 6-48.
[false]
URL = "h://en.wikiped.o
[true]
URL = "h://en.wikipedia.o
wikiped-->wikipedia

Note from the Author or Editor:
Caused by a conversion error when producing the Early Release material. Fixed in the printed book.

In the “Why python” chapter, the section “That’s python’s default variable” the last sentence “…but it’s value…” “it’s” should be “its”. The former is a contraction of “it is” and the correct form is the possessive. Print version page 15.

Note from the Author or Editor:
Change "it's" to "its" in second line from the bottom of the page.

In second line of this paragraph, "funciton" should be "function".

Note from the Author or Editor:
Change "funciton" to "function" near bottom of page.

Original: popular structured text format, sometimes call a “document”
Change to: popular structured text format, sometimes called a “document”

Note from the Author or Editor:
Change "call" to "called" near middle of both pages.

Original: the print dir combo manbo…
Suggested fix: the print dir combo mambo…

Note from the Author or Editor:
Change "manbo" to "mambo" on this page.

Original: It’s often useful to hink of the following one-liner as asking…
Suggested fix: It’s often useful to *t*hink of the following one-liner as asking…

Note from the Author or Editor:
Chance "hink" to "think".

Original: We’re removed the dunders…
Fix: We’ve removed the dunders

Note from the Author or Editor:
"We're" should be "We've"

Original: The default seperator is replaced…
Suggested fix: The default separator is replaced…

Issue: Arrow text reads: "Answers om page 80"
Suggested fix: "Answers on page 80"

Note from the Author or Editor:
Change "om" to "on" (near bottom right of page).

Original: …the “print dir” combo manbo…
Fix: …the “print dir” combo mambo…

Note from the Author or Editor:
Change annotation to read "mambo".

Issue: List of subtasks lacks trailing periods
Suggested fix: Add period for consistency with previous subtask lists (e.g. p82 and p92)

Issue: Missing periods after subtasks
Suggested fix: Add periods at end of each subtask for consistency.

Original: You first saw for in the opening chatper…
Fix: You first saw for in the opening chapter…

Note from the Author or Editor:
Last paragraph: change "chatper" to "chapter".

Original: 1. You need to initialize a counter, which we’ve called “i” is this code.
Fix: Change "is" to "in": 1. You need to initialize a counter, which we’ve called “i” in this code.

Note from the Author or Editor:
Annotation #1: change "is this" to "in this".

Original: We created a new, empty list called “converts” by assigning an empty list to it.
Issue: Creating a list by assigning a list to it.
Suggested Fix: We created a variable called “converts” and assigned a new empty list to it.

Note from the Author or Editor:
Let's apply the suggested fix, which is a better/clearer description of what's going on here.

*really minuscule* ;)
Issue: Leading whitespace before entry: ' The rest of the file object methods' […]
Fix: Change to 'The rest of the file object methods' […]

Note from the Author or Editor:
Remove extra whitespace as described. Sixth bullet point from the bottom on the LHS of page 124.

Original:
Alex: So we have a ways to go yet…

Suggested fix: remove plural 's' on 'a ways' so text reads:
Alex: So we have a way to go yet…

Note from the Author or Editor:
I'm suggesting we leave this as is, as using "ways" in this way is perfectly OK this side of the Atlantic (which, I'll admit, might be an Irish thing). But... feel free to adjust if deemed necessary.

Original: As you can
imagine, the PSL has you covered when it
comes to doing this sort of thing..

Fix: Remove one period at end of line.

Note from the Author or Editor:
Remove extra period from end of middle paragraph.

Original: The easiest way to do this is to clear all of your notebook’s cells […]
Issue: This sounds like the contents of the cells needs to be cleared out instead of the outputs.
Suggested fix: The easiest way to do this is to clear all outputs of your notebook’s cells […]

Note from the Author or Editor:
Adjust start of the second sentence to read "The easiest way to do this is to clear all of the outputs from your notebook’s cells... "

Original: When you combine it with SVG, you can create visuals is text, too.
Suggested fix: When you combine it with SVG, you can create visuals [as|in|from] text, too.

Note from the Author or Editor:
Replace "visuals is text, too" with "visuals from text, too".

Original: This is really stating to come together
Suggested fix: This is really starting to come together

Note from the Author or Editor:
Change "stating" to "starting" in page heading.

Original: "Unlike sets (which contain a collection of unque values) […]"
Fix: "Unlike sets (which contain a collection of unique values) […]"

Note from the Author or Editor:
Change "unque" to "unique" in 6th bullet item.

Original: When Jinja2 see this markup […]
Fix: When Jinja2 sees this markup […]

Note from the Author or Editor:
Change "see" to "sees" in top-right annotation.

Original: "In Jinja templates, the Python code […]"
Fix: Add "2".

Note from the Author or Editor:
Page 347 and 348, crossword clue "3 down", replace Jinja with Jinja2.

next to last line of Mara's paragraph, "an idea of how that are progressing"
"that" probably should be "they"

Note from the Author or Editor:
Change "that" to "they" Mara's second paragraph from top of page.

Question 3: The answer states "Rarely. The code used with the Coach's webapp happily runs on Python 3.6 and above (due to its use of f-stings) - f-stings should be f-strings.

Note from the Author or Editor:
This errata refers to page 345... and yes, it should read "f-string". (Second line of answer to question at top-right of page).

Original: »Perhaps you have a isn’t arranged in the way it needs to be.list of lists, but you really need a dictionary of dictionaries.«

It actually looks very much as if part of the intro heading accidentally got copied into this sentence. If you remove "isn’t arranged in the way it needs to be." it all makes sense again and the 1st sentence becomes:

»Perhaps you have a list of lists, but you really need a dictionary of dictionaries.«

Note from the Author or Editor:
The text on this page should mirror that from the Table of Contents, page xvii.

Adjust the opening text to match page xvii.

Original: "To get started, add to your list of imports …"
Issue: Possibly missing info about what is being added - but also works as is since it is clarified in the annotations below.
Suggested change: "To get started, add »json« to your list of imports …"

Note from the Author or Editor:
Add the word "json" as per suggested change.

"This is an near perfect match..."
"an" should be "a"

Note from the Author or Editor:
Change "an" to "a" in annotation text at start of bottom-left of this page.

Original: "When “head” is used, it shows the first five rows from the dataframe."
Suggestion: Add info that 5 is the default value, but other numbers can be given, e.g. table.head(3).

Note from the Author or Editor:
Change the last line of the "head" annotation to read:

When "head" is used, it defaults to showing the first five rows from the dataframe, but other amounts can be specified, for example: ".head(10)" or ".head(3)".

2/3 down the paragraph
"is associated with a inner,"

"a" should be "an"

Original: "The head function, lets you view the first five rows of
data in any dataframe."

Suggestion: Add a little annotation regarding default behaviour of head().

Note from the Author or Editor:
Change this bullet point to read: "The head function lets you view any number of rows of data from the start of your dataframe (and defaults to the first five)."

4th line, "assumming" should be "assuming"

Original: "[tab] filtering condition holds.."
Issue: double period
Fix: remove on and reuse

Note from the Author or Editor:
Remove extra period at the end of the indented text at bottom of page.

Original: "Here is our code. How does your compare?"
Fix: Change to: "Here is our code. How does yours compare?"

Note from the Author or Editor:
Change "your" to "yours" at the end of paragraph 2, middle of page.

Original: "The fetchall database method (when is returns data) always returns a list of these."
Fix: "The fetchall database method (when it returns data) always returns a list of these."

Note from the Author or Editor:
Change "is" to "it" for 4 down clue.

Issue: Here the heading "Reusing your tables, 2 of 2" is formatted as "Heading1", while two pages before "Heading2" is used to format "Reusing your tables, 1 of 2".

Note from the Author or Editor:
Changing the heading on page 576 to "Heading1" is possible, but will impact the TOC (as all Heading1s make an appearance there). Changing the heading on page 578 to a Heading2 goes a little against the Head First page layout standards. I'm going to cop-out here, and leave it up to the O'Reilly editors to decide which of these heading formatting options is changed (if any). ;-)

On the final "/swims" page on the webapp its prompting the user to "please select a chosen_date". By substituing "chosen_date" to "date" in the final app.py version you can make this prettier to "please select a date".

Love your book! Thanks a lot :)

Note from the Author or Editor:
Yes, indeed, the messaging on the "Select a swim session" form could be better. Further proof that UI design is not my strong suit. Please adjust the messaging as required.

On the third line of this annotation, change "jus-created" to "just-created".

Original: "And of course (your old friend) the print dir combo mambo reports the list of methods included with every dictionar"
Issue: Last two characters are missing ("y:").

Note from the Author or Editor:
Add "y:" to the end of the line as indicated above. The actual page number is 244.