tutorials:python_quick_reference
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tutorials:python_quick_reference [2021/05/13 16:01] marcus.williams [Jupyter Notebook Markdown Tricks] |
tutorials:python_quick_reference [2021/08/06 14:20] marcus.williams [Data import and export] |
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| Line 76: | Line 76: | ||
| <code> | <code> | ||
| df_structure = gpd.read_file(myLayers.gdb, layer='structure') | df_structure = gpd.read_file(myLayers.gdb, layer='structure') | ||
| + | </code> | ||
| + | |||
| + | Round trip export/import for json files, as Python dictionaries or lists. Requires ''import json''. | ||
| + | |||
| + | <code> | ||
| + | filename = 'folderX/list_CEUDSector_ind.json' | ||
| + | with open(filename, 'w', encoding='utf-8') as f: | ||
| + | json.dump(l_CEUDSector_ind, f, ensure_ascii=False, indent=4) | ||
| + | </code> | ||
| + | |||
| + | <code> | ||
| + | filename = 'folderX/list_CEUDSector_ind.json' | ||
| + | with open(filename) as data_file: | ||
| + | l_CEUDSector_ind= json.load(data_file) | ||
| </code> | </code> | ||
| Line 105: | Line 119: | ||
| <code> | <code> | ||
| pt_structure = pd.pivot_table(df_structure, | pt_structure = pd.pivot_table(df_structure, | ||
| - | 'OBJECTID', | + | values='OBJECTID', |
| index=['propType'], | index=['propType'], | ||
| columns=['strucType'], | columns=['strucType'], | ||
| margins=True, | margins=True, | ||
| - | aggfunc=len) | + | aggfunc=np.sum) |
| </code> | </code> | ||
| [[http://pandas.pydata.org/pandas-docs/stable/generated/pandas.pivot_table.html#pandas.pivot_table|ref]] | | [[http://pandas.pydata.org/pandas-docs/stable/generated/pandas.pivot_table.html#pandas.pivot_table|ref]] | | ||
| Line 454: | Line 468: | ||
| </code> | </code> | ||
| - | ''n'' for next line; ''c'' to continue; ''s'' for step | + | ''n'' for next line; ''c'' to continue; ''s'' for step; ''exit'' for exit |
| ===== Other functions ===== | ===== Other functions ===== | ||
| ==== A ==== | ==== A ==== | ||
| Line 580: | Line 594: | ||
| <code> | <code> | ||
| set([1,2,3]) - set([2,3,4]) | set([1,2,3]) - set([2,3,4]) | ||
| + | </code> | ||
| + | |||
| + | See other set [[https://www.w3schools.com/python/python_ref_set.asp|operations]] including: | ||
| + | <code> | ||
| + | set1.union(set2) | ||
| + | set1.intersection(set2) | ||
| </code> | </code> | ||
| ==== T ==== | ==== T ==== | ||
tutorials/python_quick_reference.txt ยท Last modified: 2021/08/06 22:20 by marcus.williams
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