How Python sorts different dictionaries through public keys

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This kind of structure is sorted by the itemgetter function in the operator module.

Rows = [{'fname':' Brian', 'lname':' Jones', 'uid': 1003}, {' fname': 'David',' lname': 'Beazley',' uid': 1002}, {'fname':' John', 'lname':' Cleese', 'uid': 1001}, {' fname': 'Big',' lname': 'Jones',' uid': 1004}]

Sort by the fields common to all dictionaries, which can be the key name of the dictionary, a list element represented by a number, or any value that can be passed to the _ _ getitem__ () method of the object.

If multiple tags are passed to itemgetter (), the callable object it produces will return a tuple containing all elements, and then sorted () will sort the output based on the sort result of the tuple.

From operator import itemgetterrows_by_fname = sorted (rows, key=itemgetter ('fname')) rows_by_uid = sorted (rows, key=itemgetter (' uid')) print (rows_by_fname) # [{'fname':' Big', 'uid': 1004,' lname': 'Jones'}, # {' fname': 'Brian',' uid': 1003, 'lname':' Jones'}, # {'fname':' David', 'uid': 1002 'lname':' Beazley'}, # {'fname':' John', 'uid': 1001,' lname': 'Cleese'}] print (rows_by_uid) # [{' fname': 'John',' uid': 1001, 'lname':' Cleese'}, # {'fname':' David', 'uid': 1002,' lname': 'Beazley'}, # {' fname': 'Brian',' uid': 1003 'lname':' Jones'}, # {'fname':' Big', 'uid': 1004,' lname': 'Jones'}]

When the itemgetter () function accepts multiple keys

Rows_by_lfname = sorted (rows, key=itemgetter ('lname',' fname')) print (rows_by_lfname) # [{'fname':' David', 'uid': 1002,' lname': 'Beazley'}, # {' fname': 'John',' uid': 1001, 'lname':' Cleese'}, # {'fname':' Big', 'uid': 1004,' lname': 'Jones'} # {'fname':' Brian', 'uid': 1003,' lname': 'Jones'}]

Itemgetter () also applies to min () and max () functions.

> min (rows, key=itemgetter ('uid')) {' fname': 'John',' lname': 'Cleese',' uid': 1001} > max (rows, key=itemgetter ('uid')) {' fname': 'Big',' lname': 'Jones',' uid': 1004} is all the contents of the article "how Python sorts different dictionaries through public keys". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!