using txt file as input for python

using txt file as input for python

I have a python program that requires the user to paste text to it to
process it to da various tasks. Like this:
line=(input("Paste text here: ")).lower()
The pasted text comes from a .txt file. To avoid any issues with the code
(since the text contains multiple quotation marks), the user has to do the
following: type 3 quotation marks, paste the text and type 3 quotation
marls again.
Can all of the above be avoided by having python read the .txt? and if so,
how?
Please let me know if the question makes sense.