["python","dictionary"]
In Python, how do I loop through the dictionary and change the value if it equals something?

If the value is None, I'd like to change it to "" (empty string). I start off like this, but I forget: for k, v in mydict.items(): if v is None: ... right?
for k, v in mydict.iteritems(): if v is None: mydict[k] = '' In a more general case, e.g. if you were adding or removing keys, it might not be safe to change the structure of the container you're looping on -- so using items to loop on an independent list copy thereof might be prudent -- but assigning a different value at a given existing index does not incur any problem, so, in Python 2.any, it's better to use iteritems. In Python3 however the code gives AttributeError: 'dict' object has no attribute 'iteritems' error. Use items() instead of iteritems() here. Refer to this post.