other:python:misc_by_jyp
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other:python:misc_by_jyp [2021/10/26 11:27] jypeter Added sorting section |
other:python:misc_by_jyp [2021/10/27 14:05] jypeter Added sets |
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| Check the [[https://docs.python.org/3/library/collections.html#collections.OrderedDict|OrderedDict class]] (''from collections import OrderedDict'') and the [[https://realpython.com/python-ordereddict/|OrderedDict vs dict in Python: The Right Tool for the Job]] tutorial | Check the [[https://docs.python.org/3/library/collections.html#collections.OrderedDict|OrderedDict class]] (''from collections import OrderedDict'') and the [[https://realpython.com/python-ordereddict/|OrderedDict vs dict in Python: The Right Tool for the Job]] tutorial | ||
| + | |||
| + | ==== Using sets ==== | ||
| + | |||
| + | [[https://docs.python.org/3/tutorial/datastructures.html#sets|Python sets]] are **groups of unique elements**. They can be used to easily find all the unique elements of //something// and you can easily determine the **intersection**, **union** (and other similar operations) of sets. | ||
| ==== Printing a readable version of long lists or dictionaries ==== | ==== Printing a readable version of long lists or dictionaries ==== | ||
| Line 202: | Line 206: | ||
| ==== Sorting ==== | ==== Sorting ==== | ||
| - | <code>Some code</code> | + | * [[https://docs.python.org/3/howto/sorting.html|Sorting HOW TO]] |
| + | * Example: sorting the keys and the values of a dictionary, and then using the ''key'' parameter to sort the keys of a dictionary according to the value associated with the key | ||
| + | * If we provide a ''key'' function, the ''sort'' function will sort the elements by the values returned by the function, instead of sorting by the initial values. The function used for generating the key below is very simple and we can use a //lambda// (i.e //in place//) function | ||
| + | * <code>>>> demo_dic = {'a':10, 'b':5, 'c':-1, 'd':0} | ||
| + | |||
| + | >>> sorted(demo_dic.keys()) | ||
| + | ['a', 'b', 'c', 'd'] | ||
| + | |||
| + | >>> sorted(demo_dic.values()) | ||
| + | [-1, 0, 5, 10] | ||
| + | |||
| + | >>> sorted(demo_dic.keys(), key=lambda key_name:demo_dic[key_name]) | ||
| + | ['c', 'd', 'b', 'a']</code> | ||
| /* | /* | ||
other/python/misc_by_jyp.txt · Last modified: 2024/04/17 09:25 by jypeter
