With wxPython a password field could be created as:  
wx.TextCtrl(frm, -1, '', style=wx.TE_PASSWORD )
I'm wondering if there is a way to dynamically change this password field into a normal textctrl, such that user could see what the password is.
then it would not be a password entry, but you can use style=wx.TE_MULTILINE or TE_RICH. if that is what you are asking.
Hope this helps
how to make wxpython password textctrl show chars?