allendowney/elementsofdatascience

An introduction to data science in Python, for people with no programming experience.

elementsofdatascience's Issues

notebook 13 down

The link to run notebook 13 on collab and the one to download it both return 404 errors. I also noticed there are two notebook 11s in the repository, one for inference and the other for resampling. Perhaps the inference notebook got mislabeled?

issue

I have a general issue.

Harrumph

>_<

07_dataframes : certificate error when trying to download data files

When trying to download data files from the following cell :

download('https://ftp.cdc.gov/pub/health_statistics/nchs/' +
'datasets/NSFG/stata/' + dict_file)

I got the following error :

URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1129)>

I execute the notebook on local not on colab.

04_loops : UnicodeDecodeError: 'charmap' codec can't decode byte 0x9d in position 619: character maps to <undefined>

The encoding on my windows computer is 'cp1252'.
When I execute the following cell of the 04_loops notebook:
fp = open('2600-0.txt') count = 0 for line in fp: count += 1

I get the following error:
UnicodeDecodeError: 'charmap' codec can't decode byte 0x9d in position 619: character maps to <undefined>

I executed the notebook on local and not on colab
The issue is solved with encoding='utf8'

NameError: name 'string' is not defined in 05_dictionaries.html

The html version of you book contains an exception where an output is expected:

https://allendowney.github.io/ElementsOfDataScience/05_dictionaries.html#punctuation

After the paragraph "Here’s what happens when we try to remove the punctuation"

---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-2-28f1a7003571> in <module>
      1 for word in line.split():
----> 2     word = word.strip(string.punctuation)
      3     print(word)

NameError: name 'string' is not defined

typo

02_times.ipynb text after cell 13:

You can also get[s] the name of the month and the day of the week.

04_loops : last line of War and Peace changed

In 04_loops, the last line of War And Peace is :
*** END OF THE PROJECT GUTENBERG EBOOK WAR AND PEACE ***

and no longer :
End of the Project Gutenberg EBook of War and Peace, by Leo Tolstoy

interval error

Hello Allen,

I just found a minor typo in the book.
From the topic of resampling and bootstrapping:
You express "np.percentile(t2, [5, 95])" as 90% confidence interval which is in fact 95% confidence interval.

ex)
np.percentile(t2, [5, 95])

ex)
def summarize(t, digits=2):
table = pd.DataFrame(columns=['Estimate', 'SE', 'CI90'])
est = np.mean(t).round(digits)
SE = np.std(t).round(digits)
CI90 = np.percentile(t, [5, 95]).round(digits)
table.loc[''] = est, SE, CI90
return table

Your book is amazing. Thank you for sharing!

Sincerely,
Dong Gil Kim

01_variables: Small typo

Hi Allen,

In 01_variables, I noticed a grammar typo in the first sentence of the first section. There's an extra "s" which shouldn't be there:

"Data science is the use of data to answers questions and guide decision making."

I'm a big fan of Thinking Python and want to take this opportunity to thank you for writing all your wonderful books and releasing them under Creative Commons :)

JF Koh from Singapore

NameError: name 'np' is not defined in 03_arrays.html

The html version of you book contains an exception where an output is expected:

https://allendowney.github.io/ElementsOfDataScience/03_arrays.html#summarizing-relative-differences

---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-1-5c1b45c0d131> in <module>
----> 1 np.min(percent_differences), np.max(percent_differences)

NameError: name 'np' is not defined