Function to prune dictionary keys not working

[Girish Sahani]

hi ppl,
 Here is a simple function to remove those keys of a dictionary whose
values are less than some specified value. But it isnt working. Please
help.

def prune(d,cp):
    l = []
    for rule,value in d.iteritems():
        #print value
        if value >= cp:
            l.append(rule)
    return l


>>> d = {'be=>c': '1.00', 'c=>da': '0.50', 'ea=>b': '0.33', 'be=>d':
'0.50', 'c=>ba': '0.33', 'bd=>a': '1.00', 'a=>cb': '0.33', 'ea=>c':
'0.67', 'a=>cd': '0.50', 'e=>ac': '0.40', 'e=>ab': '0.20', 'c=>bd':
'0.33', 'e=>cb': '0.40', 'ed=>b': '0.25', 'ed=>c': '0.50'}
>>> cp = 0.5
>>> if prune(d,cp) == d.keys():
	print "code not working :(("

code not working :((