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Table 36
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Methods and Operations for Dictionaries Description
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Item
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len(m) m[k] m[k]=x
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Returns the number of items in m Returns the item of m with key k Sets m[k] to x del m[k] Removes m[k] from m k in m Returns True if k is a key in m mclear() Removes all items from m mcopy() Makes a copy of m mfromkeys(s [,value]) Create a new dictionary with keys from sequence s and values all set to value mget(k [,v]) Returns m[k] if found; otherwise, returns v mhas_key(k) Returns True if m has key k; otherwise, returns False (Deprecated, use the in operator instead Python 2 only) mitems() Returns a sequence of (key,value) pairs mkeys() Returns a sequence of key values mpop(k [,default]) Returns m[k] if found and removes it from m; otherwise, returns default if supplied or raises KeyError if not mpopitem() Removes a random (key,value) pair from m and returns it as a tuple msetdefault(k [, v]) Returns m[k] if found; otherwise, returns v and sets m[k] = v mupdate(b) Adds all objects from b to m mvalues() Returns a sequence of all values in m
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Most of the methods in Table 36 are used to manipulate or retrieve the contents of a dictionaryThe mclear() method removes all itemsThe mupdate(b) method updates the current mapping object by inserting all the (key,value) pairs found in the mapping object bThe mget(k [,v]) method retrieves an object but allows for an optional default value, v, that s returned if no such key existsThe msetdefault(k [,v]) method is similar to mget(), except that in addition to returning v if no object exists, it sets m[k] = v If v is omitted, it defaults to NoneThe mpop() method returns an item from a dictionary and removes it at the same timeThe mpopitem() method is used to iteratively destroy the contents of a dictionary The mcopy() method makes a shallow copy of the items contained in a mapping object and places them in a new mapping objectThe mfromkeys(s [,value]) method creates a new mapping with keys all taken from a sequence s The type of the resulting mapping will be the same as mThe value associated with all of these keys is set to None unless an alternative value is given with the optional value parameterThe fromkeys() method is defined as a class method, so an alternative way to invoke it would be to use the class name such as dictfromkeys() The mitems() method returns a sequence containing (key,value) pairsThe mkeys() method returns a sequence with all the key values, and the mvalues() method returns a sequence with all the values For these methods, you should assume that the only safe operation that can be performed on the result is iteration In Python 2 the result is a list, but in Python 3 the result is an iterator that iterates over the current contents of the mapping If you write code that simply assumes it is an iterator, it will
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be generally compatible with both versions of Python If you need to store the result of these methods as data, make a copy by storing it in a list For example, items = list(mitems()) If you simply want a list of all keys, use keys = list(m)
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A set is an unordered collection of unique items Unlike sequences, sets provide no indexing or slicing operationsThey are also unlike dictionaries in that there are no key values associated with the objectsThe items placed into a set must be immutableTwo different set types are available: set is a mutable set, and frozenset is an immutable set Both kinds of sets are created using a pair of built-in functions:
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s = set([1,5,10,15]) f = frozenset(['a',37,'hello'])
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Both set() and frozenset() populate the set by iterating over the supplied argument Both kinds of sets provide the methods outlined in Table 37
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