On Thu, 27 Oct 2005 16:46:32 -0400, Mike Meyer <[EMAIL PROTECTED]> wrote:
>"dcrespo" <[EMAIL PROTECTED]> writes: > >> Hi all, >> >> How can I replace all None values with the string 'Null' in a >> dictionary? > >Iterate over everything in the dictionary: > >for key, item in mydict.items(): > if item is None: > mydict[key] = 'Null' > Which is probably more efficient than one-liner updating the dict with mydict.update((k,'Null') for k,v in mydict.items() if v is None) as in >>> mydict = dict(a=1, b=None, c=3, d=None, e=5) >>> mydict {'a': 1, 'c': 3, 'b': None, 'e': 5, 'd': None} >>> mydict.update((k,'Null') for k,v in mydict.items() if v is None) >>> mydict {'a': 1, 'c': 3, 'b': 'Null', 'e': 5, 'd': 'Null'} (too lazy to measure ;-) Regards, Bengt Richter -- http://mail.python.org/mailman/listinfo/python-list