How do you check if list is blank?

Possible Duplicate:
Python: What is the best way to check if a list is empty?

def CleanWhiteSpace(theDict):
    stuff=[]

    for key,value in theDict.items():
        for d in value:
            if value != " ":
                stuff.append(d)    
                print d
                theDict[key]=stuff
            if not value[d]:
                print value
        stuff=[]
    return theDict
    print CleanWhiteSpace({'a':['1','2'],'b':['3',' '],'c':[]})

I edited this because I need more help. How do you check if c is blank? Is c is simply equal to [] ?

I've tried ==[] and "[]" and getting the length and == "" , but nothing seems to work.

---

在python中，空列表的计算结果为False。

if not c:
   print "The list is empty"
else:
   print "The list is not empty"

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