Jupyter Notebooks (US Wk 3)

Question 1

How to open a jupyter notebook?

Answer 1

Anaconda command prompt: jupyter notebook (opens in browser)

Question 2

reference the output of the last executed cell

Answer 2

underscore. _ * 3&raquo_space; last output * 3

Question 3

Keyboard shortcut to switch arrows from navigating in a cell to navigating amongst cells

Answer 3

Esc from within the cell, then “enter” to enter a cell

Question 4

What is a markdown cell in a jupyter notebook?

Answer 4

Allows you to format using headings, bold, latex equations, lists, etc

Question 5

How do you save a non-executable version of the notebook?

Answer 5

File save as – HTML

Question 6

execute unix command in notebook, eg ls directory

Answer 6

!ls . (exclamation point before)

Question 7

store the filename in a variable

Answer 7

filename = ‘filename.txt’

Question 8

unix command to count the number of lines in the file, w/ var filename

Answer 8

!wc -l $filename (need the $ on the variable)

Question 9

unix command to get the value of variable filename

Answer 9

!echo $filename

Question 10

count the lines in a filename with word liberty

Answer 10

!grep -o ‘liberty’ $filename | wc -l

Question 11

replace blueberries with apples and output to a new file

Answer 11

!sed -e ‘s/Apples/Blueberries/g’ ‘fruits2.txt’ > fruits3.txt