I'm adding data into array but, it's end up with only the last item in the array. It seems to overwrite

request.session['list'] = []
if request.开发者_StackOverflow中文版method =='POST':    
  newrecord = request.POST['market']
  tmp = request.session['list']
  tmp.append(newrecord)
  request.session['market_list'] = tmp

I turn out that previous data was overwrite by the new one

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You are assigning an empty list to request.session['list'] in the first line of the code snippet you have given. Is this by design? In that case it is no surprise that tmp always ends up with one element only.

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change request.session['list'] = [] to

if not request.session.has_key('list'):     
  request.session['list'] = []