python - win32api.messagebox gets called on program start -

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i have simple python program using familiar win32api message calls. put line in program 

mywin['button'].onclick = win32api.messagebox(0, 'hello', 'title')

the problem message box gets displayed program starts. , not displayed when button clicked. ideas doing wrong?

here rest of code:

import gui import win32api  gui.window(name='mywin', title=u'gui2py minimal app', resizable=true, height='459px', width='400px', image='', ) gui.button(label=u'click me!', name='button', left='8', top='115', default=true, parent='mywin', )  # reference top level window: mywin = gui.get("mywin")  mywin['button'].onclick = win32api.messagebox(0, 'hello', 'title')  if name == "main":     mywin.show()     gui.main_loop()

you assigning .onclick attribute return value of calling win32api.messagebox. no different doing:

value = win32api.messagebox(0, 'hello', 'title') mywin['button'].onclick = value

to fix problem, can use lambda function:

mywin['button'].onclick = lambda: win32api.messagebox(0, 'hello', 'title')

the above assigns .onclick attribute lambda function. when button clicked, lambda called , win32api.messagebox(0, 'hello', 'title') code executed.


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