I am on Python 3.5 inside Spyder 3.1.3. When I enter the following code, x has an empty string. I am not asked for any user input. Cursor directly goes to the next line
import sys
x = sys.stdin.read()
print(x)
So after executing this code, x = '' So what is happening here ?
When the cursor jumps to the newline, it has started to read from stdin, so anything you type would be passed to variable x and then re-printed once you break out from stdin.
If you want user input you can use:
x = input('Say something: ')
x, but inside the Spyder console, the cursor just goes to the next line without waiting for the input. and if I type x there , it will just print an empty string
The stdin and stdout are references to file descriptors for the host OS. You didn't state the system you were running on, however in Linux; any process that is a child of the initializing process would share the same stdin / stdout.
As an example, when running from the command line or terminal, you can pipe information into it.
echo "Say something: " | ./yourscript.py
yourscript.py
#!/usr/bin/python
import sys
for line in sys.stdin.readlines():
print('boom', line)
