>>> a = 'abc' >>> b = ''.join(['a', 'b', 'c']) >>> a == b True >>> a is b False
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Python: string comparison == or is
Use == when comparing values and is when comparing identities.
Python: remove an item from list while iterating the list
list[:] = [item for item in list if match(item)]The above code removes the matching items in the list without constructing a new list, therefore, the references to the list remain valid.
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Python: remove dictionary items while iterating it
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Delete the matching items based on the keys:
for k in dict.keys(): if k == 'yes': del dict[k]
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Delete the matching items based on the values:
for k, v in dict.items(): if v == 3: del dict[k]
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