emurate c function in R

c.py

def c(*args):
   l = []
   for x in args:
      if hasattr(x, '__iter__'):
         l.extend(list(x))
      else:
         l.append(x)
   return l

# [0, 1, 2, 3, 4, 9, 14, 15, 16, 17]
print(c(range(0, 5), 9, range(14, 18)))