How can I check if a key exists in a dictionary

Question

Let s say I have an associative array like so    key1   22   key2   42    How can I check if key1 exists in the dictionary

User · Accepted Answer

if key in array      do something   Associative arrays are called dictionaries in Python and you can learn more about them in the stdtypes documentation

User · Answer

Another method is has key    if still using Python 2 X     gt  gt  gt  a   1   one   2   two    gt  gt  gt  a has key  1   True

User · Answer

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     pass   If you want to retrieve a default value when the key does not exist  use value   a get key  default value   If you want to set the default value at the same time in case the key does not exist  use value   a setdefault key  default value

[python] How can I check if a key exists in a dictionary?

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