How can I check if a key exists in a dictionary? [duplicate]
if key in array: # do somethingAssociative arrays are called dictionaries in Python and you can learn more about them in the stdtypes documentation.
Another method is has_key() (if still using Python 2.X):
>>> a={"1":"one","2":"two"}>>> a.has_key("1")True
If you want to retrieve the key's value if it exists, you can also use
try: value = a[key]except KeyError: # Key is not present passIf you want to retrieve a default value when the key does not exist, usevalue = a.get(key, default_value).If you want to set the default value at the same time in case the key does not exist, usevalue = a.setdefault(key, default_value).