This example contains two use filters for arrays:

def MedianFilter(x,n):
  # median filter of array x, length n
  # filter behaves pretty well at the edges (shortens the length as needed)
  def med(x):
    x.sort()
    return x[len(x)/2]
  # force odd filter order (better filters then)
  if n%2==0:
    n += 1
  nh = n/2
  l = len(x)
  p = list(x)
  for i in range(nh):
    v = x[0:n-nh+i]
    p[i] = med(v)
  for i in range(nh,l-nh):
    v = x[i-nh:i-nh+n]
    p[i] = med(v)
  for i in range(l-nh,l):
    v = x[i-nh:l]
    p[i] = med(v)
  return p

def LowpassFilter(p,N,C):
  # N-tap running average, run C times
  l = len(p)
  if (N%2): N += 1 # N odd: zero phase
  NH = N / 2
  r = list(p)
  for c in range(C):
    lpad = [r[0] for i in range(NH)]
    rpad = [r[l-1] for i in range(NH)]
    rr = lpad + r + rpad
    r = [sum(rr[i:i+N])/N for i in range(l)]
  return r