Differences

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--- other:python:misc_by_jyp [2021/07/15 15:29] – [Working with paths and filenames] Added shutil and and example jypeter
+++ other:python:misc_by_jyp [2021/08/25 14:00] – [Working with paths and filenames] Added more examples jypeter
@@ Line 2: / Line 2: @@
 <WRAP center round tip 60%>
-You will find on this page some useful, but unsorted, python tips and tricks that can't fit in a section of the main [[other:python:jyp_steps|JYP's recommended steps for learning python]] page
+You will find on this page some **useful, but unsorted, python tips and tricks** that can't fit in a section of the main [[other:python:jyp_steps|JYP's recommended steps for learning python]] page
 </WRAP>
@@ Line 50: / Line 50: @@
     * [[https://docs.python.org/3/library/pathlib.html#correspondence-to-tools-in-the-os-module|Matching pathlib, and os or os.path functions]]
   * [[https://docs.python.org/3/library/shutil.html|High-level file operations]]
+=== Example: getting the full path of the Python used ===
+<code>>>> import shutil
+>>> my_python = shutil.which('python')
+>>> my_python
+'/home/share/unix_files/cdat/miniconda3_21-02/envs/cdatm_py3/bin/python'</code>
+=== Example: getting the full path of a script ===
+<code>>>> import os
+>>> os.getcwd()
+'/home/jypmce/PMIP4'
+>>> os.path.exists('./argv_test.py')
+True
+>>> os.path.abspath('./argv_test.py')
+'/home/jypmce/PMIP4/argv_test.py'
+>>> os.path.exists('/home/jypmce/PMIP4/argv_test.py')
+True
+</code>
 === Example: getting the size(s) of all the files in a directory ===
@@ Line 107: / Line 130: @@
 [[https://docs.python.org/3/library/argparse.html|argparse]] (//parser for command-line options, arguments and sub-commands//) is available since Python version 3.2
+==== Using ordered dictionaries ====
+**Dictionary order is guaranteed to be insertion order**! Note that the [[https://docs.python.org/3/library/stdtypes.html#dict|usual Python dictionary]] also guarantees the order since version **3.6**
+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
+==== Printing a readable version of long lists or dictionaries ====
+The [[https://docs.python.org/3/library/pprint.html|pprint]] module can be used for //pretty printing// objects (lists, dictionaries, ...). It will wrap long lines in a meaningful way
+<code>>>> from collections import OrderedDict
+>>> test_dic = OrderedDict([('AWI-ESM-1-1-LR_AWI', {'r1i1p1f1': {'grid': 'gn'}}), ('CESM2_NCAR', {'r1i1p1f1': {'grid': 'gn'}}), ('IPSL-CM6A-LR_IPSL', {'r1i1p1f1': {'grid': 'gr'}, 'r1i1p1f2': {'grid': 'gr'}, 'r1i1p1f3': {'grid': 'gr'}, 'r1i1p1f4': {'grid': 'gr'}})])
+>>> print(test_dic)
+OrderedDict([('AWI-ESM-1-1-LR_AWI', {'r1i1p1f1': {'grid': 'gn'}}), ('CESM2_NCAR', {'r1i1p1f1': {'grid': 'gn'}}), ('IPSL-CM6A-LR_IPSL', {'r1i1p1f1': {'grid': 'gr'}, 'r1i1p1f2': {'grid': 'gr'}, 'r1i1p1f3': {'grid': 'gr'}, 'r1i1p1f4': {'grid': 'gr'}})])
+>>> pprint.pprint(test_dic)
+OrderedDict([('AWI-ESM-1-1-LR_AWI', {'r1i1p1f1': {'grid': 'gn'}}),
+             ('CESM2_NCAR', {'r1i1p1f1': {'grid': 'gn'}}),
+             ('IPSL-CM6A-LR_IPSL',
+              {'r1i1p1f1': {'grid': 'gr'},
+               'r1i1p1f2': {'grid': 'gr'},
+               'r1i1p1f3': {'grid': 'gr'},
+               'r1i1p1f4': {'grid': 'gr'}})])
+</code>
 /*