Hide Maya 2017 "Sign In" button at the top of the screen.

hideSignInButton.py

from PySide2 import QtWidgets

def mainWindow(widget):
    mw = widget.parent()
    if not mw:
        return widget
    return mainWindow(mw)

if __name__ == "__main__":
    mw = mainWindow(QtWidgets.QApplication.activeWindow())
    for name in ("IPM_Button_Placeholder", "IPMButtonCollapse"):
        for w in mw.findChildren(QtWidgets.QWidget, name):
            w.setHidden(True)