title: How to check if a file exists in Go?
body: <p>Go's standard library does not have a function solely intended to check if a file exists or not (like Python's <a href="http://docs.python.org/library/os.path.html#os.path.exists" rel="noreferrer"><code>os.path.exists</code></a>). What is the <strong>idiomatic</strong> way to do it?</p>