So you developed a Python program that reads data using input() or stdio.readString() and want to input a massive amount of data from a file called input.txt. How do you take the data from your file and place it on the standard input stream for your program?

Mac and Ubuntu: Terminal

python3 program.py < input.txt

If you have command line arguments c1, c2 and c3:

python3 program.py c1 c2 c3 < input.txt

Windows

Command Prompt

python program.py < input.txt

If you have command line arguments c1, c2 and c3:

python program.py c1 c2 c3 < input.txt

Powershell

Get-Content input.txt | python program.py

If you have command line arguments c1, c2 and c3:

Get-Content input.txt | python program.py c1 c2 c3