explicitly setting style sheet in python pyqt4?

Question

In pyqt standard way for setting style sheet is like this:

MainWindow.setStyleSheet(_fromUtf8("/*\n"
"gridline-color: rgb(85, 170, 255);\n"
"QToolTip\n"
"{\n"
"    border: 1px solid #76797C;\n"
"    background-color: rgb(90, 102, 117);;\n"
"    color: white;\n"
"    padding: 5px;\n"
"    opacity: 200;\n"
"}\n"
"#label_3{\n"
"    background-color:rgb(90, 102, 117);\n"
"    color:white;\n"
"    padding-left:20px;\n"
" \n"
"}\n"
"#label_2{\n"
"    color:white;\n"
"    padding-left:20px;\n"
" \n"
"}\n"

But like we link the stylesheet in html <link rel="stylesheet" href="style.css"> .can't we do the same in pyqt?It helps in organizing the things.

Possible duplicate: http://stackoverflow.com/questions/22504421/pyqt-how-to-apply-style-sheet-to-a-custom-widget — Laurent LAPORTE, Oct 01 '16 at 19:28
@kragor. I think Laurent was suggesting that you could make things a whole lot simpler if you used triple quotes. — ekhumoro, Oct 01 '16 at 23:37
There is no built-in function in Qt to load an external style sheet. But you can stil do it yourself, like [here](http://stackoverflow.com/questions/14506787/reading-pyqt-stylesheet-from-external-qss-file/14506980). — ImportanceOfBeingErnest, Oct 02 '16 at 07:56
Or put all the (triple-quoted) stylesheets in a *styles.py* module and import them as needed. — ekhumoro, Oct 02 '16 at 18:53
thanks for the ideas,but my question was is there any way to explicitly link the style sheet in pyqt4 — kragor, Oct 02 '16 at 19:17

score 6 · Accepted Answer · answered Oct 03 '16 at 18:37

There are currently only two main ways to set a stylesheet. The first is to use the setStyleSheet method:

widget.setStyleSheet("""
    QToolTip {
        border: 1px solid #76797C;
        background-color: rgb(90, 102, 117);
        color: white;
        padding: 5px;
        opacity: 200;
    }
    """)

This will only take a string, so an external resource would need to be explicitly read from a file, or imported from a module.

The second method is to use the -stylesheet command-line argument, which allows an external qss resource to be specified as a path:

python myapp.py -stylesheet style.qss

This opens up the possibility of a tempting hack, since it is easy enough to manipulate the args passed to the QApplication constructor, and explicitly insert a default stylesheet:

import sys

args = list(sys.argv)
args[1:1] = ['-stylesheet', 'style.qss']

app = QtGui.QApplication(args)

(Inserting the extra arguments at the beginning of the list ensures that it is still possible for the user to override the default with their own stylesheet).

explicitly setting style sheet in python pyqt4?

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