How to show line numbers in Google Colaboratory?

Question:

Normally it is possible in jupyter or iPython notebooks to show lines number for a cell, however I don’t see where in Google Colaboratory (Colab).

Answers:

Holding Ctrl and pressing ML (one by one) switches on/off line numbers in the cells containing code.

Answered By: arudzinska

Yep, the shortcut (Ctrl + M + L) works,

other option is use the bar menu, at tool -> preference -> show line numbers


Update:
new path: Tools -> Settings -> Editor -> show line numbers

Answered By: Jason Angel

I see it under Tools->Settings->Editor (as on On 1//1/2020)

Answered By: qqqqq