Write a function safeopen() that takes one parameter, filename — a string giving the pathname of the file to be opened for reading. when safeopen() is used to open a file, a reference to the opened file object should be returned if no exception is raised, just like for the open() function. if an exception is raised while trying to open the file, safeopen() should return the value none.

How do i delete my account on this because i didn't read this agreements and also i put age at xd

Anetwork security application that prevents access between a private and trusted network and other untrusted networks

Scientists have changed the model of the atom as they have gathered new evidence. one of the atomic models is shown below. what experimental evidence led to the development of this atomic model from the one before it? a few of the positive particles aimed at a gold foil seemed to bounce back. the colors of light emitted from heated atoms had very specific energies. experiments with water vapor showed that elements combine in specific proportions. cathode rays were bent in the same way whenever a magnet was brought near them.