How to check if a file exists in Go?

Go’s standard library does not have a function solely intended to check if a file exists or not (like Python’s os.path.exists ). What is the idiomatic way to do it?

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To check if a file doesn’t exist, equivalent to Python’s if not os.path.exists(filename) :

if _, err := os.Stat("/path/to/whatever"); os.IsNotExist(err) {
  // path/to/whatever does not exist

To check if a file exists, equivalent to Python’s if os.path.exists(filename) :

Edited: per recent comments

if _, err := os.Stat("/path/to/whatever"); err == nil {
  // path/to/whatever exists

} else if os.IsNotExist(err) {
  // path/to/whatever does *not* exist

} else {
  // Schrodinger: file may or may not exist. See err for details.

  // Therefore, do *NOT* use !os.IsNotExist(err) to test for file existence