The course is very sloppy. The negligence is just beyond my understanding. There are typos in the text. There are false statement in what is said (e.g. about some Windows operating system long ago not supporting long file names - Windows 3.1 wasn't an OS, and Windows 95 already supported them). There are obvious lapsus linguae in what is said. There are arrogant mistakes in TESTS! E.g.: it asks "sort-5-1: What will the sorted function sort by?
and says: "first country name (alphabetically), then temperature (lowest to highest)" but in the task script are "Reykjavik, Buenos Aires, Cairo, Berlin and Caloocan "
Since when Reykjavik, Buenos Aires, Cairo, Berlin and Caloocan are countries?!?
And it gets even more interesting in the next question! I.e. "sort-5-2: What how will the following data be sorted?" and among options:
A. first country name (reverse alphabetically), then temperature (lowest to highest)
C. first country name (reverse alphabetically), then temperature (lowest to highest)
The answers A and C are exactly the same. BUT! - The "A" is correct, while "C" is not!
And the microphone used within the specialization is very sensitive - so you hear them swallow every time. And since they are visibly uncomfortable being in front of a camera, they gulp down A LOT.
The course should be proof-read, proof-heard, the videos should be edited and the exams revisited. So far it is a disgrace to Coursera and american education.