Qt pushbuttons are not shown when running script - qt

Question

The interface is shown completely in Qt, but all the buttons are not shown when running the python script.
in Qt:
in script:
Searched online, didn't find a similar issue.
Thanks in advance if anyone can help me on that!
Additional info
The python script:
class Main(QMainWindow):
def __init__(self, parent=None):
QWidget.__init__(self, parent)
uic.loadUi("edytor.ui", self)
self.layout = []
self.rgb_layout = []
self.loadlayout.clicked.connect(self.getfile)
if __name__ == "__main__":
def run_app():
app = QApplication(sys.argv)
mapp = Main()
mapp.show()
sys.exit(app.exec_())
run_app()
The script for "edytor.ui":
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>notepad</class>
<widget class="QWidget" name="notepad">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>659</width>
<height>191</height>
</rect>
</property>
<property name="windowTitle">
<string>Scan</string>
</property>
<widget class="QPushButton" name="loadlayout">
<property name="geometry">
<rect>
<x>50</x>
<y>90</y>
<width>141</width>
<height>31</height>
</rect>
</property>
<property name="font">
<font>
<pointsize>-1</pointsize>
<weight>50</weight>
<italic>false</italic>
<bold>false</bold>
</font>
</property>
<property name="styleSheet">
<string notr="true">background: white;
border-style: outset;
border-width: 0.5px;
border-radius: 5px;
border-color: gray;
font: 14px;</string>
</property>
<property name="text">
<string>Load Layout Image</string>
</property>
<property name="checkable">
<bool>true</bool>
</property>
<property name="autoDefault">
<bool>false</bool>
</property>
<property name="default">
<bool>true</bool>
</property>
<property name="flat">
<bool>false</bool>
</property>
</widget>
</widget>
<resources/>
<connections/>
</ui>
The python code doesn't show error.