other:python:misc_by_jyp
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other:python:misc_by_jyp [2022/12/12 13:56] jypeter Improved |
other:python:misc_by_jyp [2023/03/28 14:10] jypeter [matplotlib related stuff] Added the time axes section |
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| Note: a configuration file is also a way to easily store and exchange text data ! | Note: a configuration file is also a way to easily store and exchange text data ! | ||
| + | |||
| + | ===== Working with global variables ===== | ||
| + | |||
| + | There is a good chance you don't actually want/need a //global// variable. Be sure to use the ''global'' statement correctly if you want to avoid side-effects... | ||
| + | |||
| + | * [[https://docs.python.org/3/faq/programming.html?highlight=global#why-am-i-getting-an-unboundlocalerror-when-the-variable-has-a-value|Using (and changing) a global variable inside a script or module]] | ||
| + | * Simple module example\\ <code>_myvar = 10 | ||
| + | |||
| + | def set_myvar(new_val): | ||
| + | # Note: need to explicitly define a global variable (of a module) | ||
| + | # as 'global' BEFORE changing its value in a function! | ||
| + | # Otherwise, the value will not be REdefined outside the function | ||
| + | global _myvar | ||
| + | _myvar = new_val | ||
| + | |||
| + | def get_myvar(): | ||
| + | return _myvar | ||
| + | |||
| + | def myfunc(nb_repeat = 10): | ||
| + | print(nb_repeat * _myvar)</code> | ||
| + | * [[https://docs.python.org/3/faq/programming.html?highlight=global#how-do-i-share-global-variables-across-modules|Sharing global variables across modules]] | ||
| ===== Sorting ===== | ===== Sorting ===== | ||
| Line 432: | Line 453: | ||
| >>> np.add.reduceat(np.sort(vals), slices_indices) | >>> np.add.reduceat(np.sort(vals), slices_indices) | ||
| array([3. , 4.5, 8. ])</code> | array([3. , 4.5, 8. ])</code> | ||
| + | |||
| + | |||
| + | ===== matplotlib related stuff ===== | ||
| + | |||
| + | ==== Working with time axes (and ticks) ==== | ||
| + | |||
| + | If you have problems setting the limits of a time axis, choosing the ticks' locations, or specifying the style of the labels, you should check the: | ||
| + | * [[https://matplotlib.org/stable/gallery/index.html#ticks|Ticks examples' gallery]] | ||
| + | * [[https://matplotlib.org/stable/gallery/text_labels_and_annotations/date.html|Date tick labels example]] | ||
other/python/misc_by_jyp.txt · Last modified: 2024/04/19 12:02 by jypeter
