Essential knowledge

Question 1

(For NYJC Exams only)
What is the Powershell command to launch Jupyter Notebook in E: drive?

Answer 1

cd E:
jupyter notebook

Question 2

How to rename a file in File Explorer (without using right click)?

Answer 2

From menu, Home –> Rename

or

Use F2 shortcut key

Question 3

What is the shortcut key to delete a cell in Jupyter Notebook?

Answer 3

Select a cell first. Then press D, D (press D twice)

Question 4

What is the shortcut key to insert a cell in Jupyter Notebook?

Answer 4

A to insert above current cell

B to insert below current cell

Question 5

How to show line numbers in Jupyter Notebook?

Answer 5

Under the View menu, click “Toggle Line Numbers”

Question 6

How to show line numbers in IDLE?

Answer 6

You can’t; the version of IDLE in the SSOE laptops does not support line numbers. Edit in Notepad++ and copy back instead.

Question 7

How to access the extended clipboard in Windows?

Answer 7

Win+V (hold Windows key, press V)

Question 8

The minimal Python code to read in a csv file (with header) is:

Answer 8

import csv
data = []
with open(filename, ‘r’) as f:
for row in csv.DictReader(f):
data.append(row)
# f.close() is automatically called
# data is a list of dicts

Question 9

The minimal Python code to read in a csv file (without header) is:

Answer 9

import csv
data = []
with open(filename, ‘r’) as f:
for row in csv.reader(f):
data.append(row)
# f.close() is automatically called
# data is a list of tuples