Dictionaries 130820012026 Phpapp02

8/13/2019 Dictionaries 130820012026 Phpapp02

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Dictionaries in Python shafee"#e

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Python ictionary

A dictionary is mutable and is another container type that canstore any number of Python objects

Dictionaries consist of pairs (called items) of keys and theircorrespondin !alues"

Python dictionaries are also kno#n as associati!e arrays orhash tables "

$he eneral synta% of a dictionary is as follo#s& dict ' A & 234* + , & -*02 + . & 32/1


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Python ictionary /eat#res

ach key is separated from its !alue by a colon (&)"

$he items are separated by commas+ and the #hole thin isenclosed in curly braces" An empty dictionary #ithout any items is #ritten #ith just t#o

curly braces+ like this& 1" eys are uni ue #ithin a dictionary #hile !alues may not be $he !alues of a dictionary can be of any type+ but the keys

must be of an immutable data type such as strin s+ numbers+or tuples"


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ccessing 0al#es in ictionary

$o access dictionary elements+ you can use the familiar

s uare brackets alon #ith the key to obtain its !alue" 5or e%ample& dict ' ame & 7ara + A e & 8+ .lass & 5irst19

print :dict; ame


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!dating ictionary

o# can #!date a dictionary by adding a ne% entry or item i.e.4 a&ey-val#e !air56.e

modifying an e7isting entry4 or deleting an e7isting entry as sho%nbelo% in the sim!le e7am!le

dict 8 9 :;ame: :lass: :/irst: ?@

dictA: ge: 8 ) @C #!date e7isting entrydictA:School: 8 D PS SchoolD @C dd ne% entry

!rint DdictA : ge: D4 dictA: ge: @!rint DdictA :School: D4 dictA:School: @

E#t!#tdictA: ge: )

dictA:School: PS School


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elete ictionary Flements

o# can either remove individ#al dictionary elements or clear theentire contents of a dictionary

$o e%plicitly remo!e an entire dictionary+ just use the del statement"i"e&

dict ' ame & 7ara + A e & 8+ .lass & 5irst19 del dict; ame remo!e entry #ith key ame

dict"clear() 9 > remo!e all entries in dictdel dict 9 > delete entire dictionary

print :dict; A e


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Properties of Dictionary Keys:

$here are t#o important points to remember about dictionary keys &

(a) Bore than one entry per key not allo#ed" Chich means no duplicate key is allo#ed"Chen duplicate keys encountered durin assi nment+ the last assi nment #ins"

i"e&

dict ' ame & 7ara + A e & 8+ ame & Banni19

print :dict; ame


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Dictionaries 130820012026 Phpapp02