Keyword arguments with default values is the one Python feature that makes my Go code more verbose than my Python code.

  def f(a=11, b="some default", c=55.5, d=D()):
    #...

  f(c=44.4)

becomes

  type Config struct {
    a int
    b string
    c float
    d interface{}
  }

  func f(c *Config) {
    a := 11
    if c.a != 0 {
      a = c.a
    }
    b := "some default"
    if c.b != "" {
      b := c.b
    }
    c : = 55.5
    if c.c != 0.0 {
      c := c.c
    }
    d := new(D)
    if c.d != nil {
      d := c.d
    }
    //...
  }

  func main() {
    f(&Config{c: 44.4})
  }