* Remove six for PY2 compatability since our dependencies are not, PY2
is legacy.
* Removed usages of utils from future/past libraries since they are
deprecated. This includes 'from __future__ ...' and 'from past...'
statements.
* Removed compatibility imports for PY2, switched from six imports to
standard library imports.
* Removed utils code blocks that handle operations depending on PY2/3
versions.
* Removed 'from __future__ ...' lines from templates/code generators
* Used PY3 syntaxes in place of PY2 compatible blocks. eg: metaclass
- remove several unnecessary comprehensions from functions that accept a generator.
- Using `[x for x in iter]` causes a list to be built first then passed to the outer function.
- `any` and `all` can take generator instead. This makes memory usage O(1) and actually makes these functions short-circuiting. E.g. if the first condition fails then `all` will immediately return false instead of evaluating all the entries.
- `sum`, `min`, `max` => memory usage become O(1)
- `list`, `set`, `.join()` => roughly halves memory usage, as list is not required to be built.
- lastly, it's two fewer characters to read/think about.
* fix: tags patch
* fix: auto_commit_on_many_writes
* fix: check if tag exists
* fix: check if tag or tag link exists
* fix: check if column exists
* fix: set autocommit false
* fix: use ignore in insert query for bulk insert
* fix: add option to ignore duplicates
* perf: Cache db columns to avoid redundant database calls
* fix: Move cache clearing code from doctype to schema.py
* fix: self.table_name instead of self.name
* fix: Cache columns in "table_columns" key
`table_columns` was cached in meta but columns were also getting accessed
directly using frappe.db.get_table_columns. Now, it is cached at
`frappe.db` layer
Co-authored-by: Suraj Shetty <surajshetty3416@gmail.com>
```
frappe.db.set_value('Call Log', log.name, {
fieldname: doc.name,
display_name_field: doc.get_title()
}, update_modified=False)
```
this code should not fail if value is not pass because value is passed in the dict.
Previous regex used to yield false positives and false negatives
for queries like
UPDATE tabToDo SET description = "something"
Instead of yielding "tabToDo" it used to yield "tabToDo SET".
Now two separate regexes handle single word and multi-word names
In case of multi-word surrounding quotes are a must
