🔒 read() works only one time in python

[shut ore]

Here is my code:
f=open("path", "r")
while True:
while f.read()=="True":
print("output is true")
time.sleep(0.5)
file is txt and all it contains is "True" but for some reason this code writes in cmd only one time despite loop, anyone got ideas how to fix it?

[boreal marsh]

@shut ore

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[true solstice]

that's how read works. It consumes the text of the file

what exactly are you trying to do?

[shut ore]

Im trying to do it would update what my txt file contains after time and check if it still contains "True" or not

[true solstice]

Are you trying to get it to read from the file while you're typing in it?

[shut ore]

close() prob fixes it but I doubt it is right to do so

[shut ore]

yeah

[true solstice]

Yeah, it's not going to detect new changes made to the file once it has been opened by python

it has to be reopened

What are you hoping to achieve with this though?

This doesn't really seem like a practical solve for anything

[shut ore]

I plan to make my other lua script change config file in order to stop python loop, but tbh I have no idea how to do it without loop checks(this doesnt seem like right solution as well to me but it is what it is)

and its super hard to work with some libraries in lua so it doesnt seem like it is possible to write my python code there

[true solstice]

I know pyside has a file listener so you can assign it a file path and it will emit a signal if the contents of the file change

[shut ore]

Here is my code:
f=open("path", "r")
while True:
while f.read()=="True":
print("output is true")
f.close()
time.sleep(0.5)
this gives error apparently

(Io operation on closed file)

[true solstice]

from PySide2 import QtCore, QtWidgets


def on_file_change(file):
    print(f'{file} has new contents!')

app = QtWidgets.QApplication()
watcher = QtCore.QFileSystemWatcher()
watcher.addPath('foo.txt')
watcher.fileChanged.connect(on_file_change)
app.exec_()

here's an example of doing it with pyside

[shut ore]

yeah I might test this as well even tho I try to get rid of extra libs if possible

[true solstice]

any time foo.txt is modified at all, the on_file_change function will be called

[violet breach]

There's https://pypi.org/project/watchfiles/ if you don't want to install a whole UI toolkit

[true solstice]

That's probably better

[shut ore]

thank you, I will test it now

[boreal marsh]

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