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programming:python:dictionary

Python dictionary

exampleexplanation / remarks
d = {}construct an empty dictionary
d = {“age”: 17, “school”: “Adam High School”, “transportation”: “bus”}construct a dictionary with data
d[“age”]=18 add or change value of a key
v = d[“age”] get value associated with a key
l = len(d) get number of keys (which is the same as number of values)
for key,val in d.items():
loop over all key,val pairs
d.clear()delete all entries
d.copy()returns a (shallow!) copy of the dictionary
d.get(key, default=None)returns a value associated with a key. if key not found → return default
d.setdefault(key, default=None)if key exist → do nothing. if not → add the specified key,default pair
d.fromkeys(seq, value=None)seq=list of keys. add these keys to the dictionary, all having same associated value=value
d.has_key(key)returns a boolean value: True if key exists, else → False
d.keys()returns a list of the keys: [key1, key2, …]
d.values()returns an iterable of the values
d.items()returns a list of tuples: [(key1,val1),(key2,val2),…]
d.update(d2)add all d2 key,value pairs to d
del dict[“school”] delete a key,value pair based on key
type(d) <class 'dict'>
cmp(d1, d2) compares two dictionaries [need more info!]