Mercurial > cpython-lru_cache-weakref
view Doc/includes/sqlite3/simple_tableprinter.py @ 87690:66c1c9f32567 default tip
Add use_weakref option to functools.lru_cache
The use_weakref option makes lru_cache create weak references to the function
arguments when creating the cache key, which prevents them from staying in the
memory forever even after all other references to them are gone.
This is a proof of concept for http://bugs.python.org/issue19859
| author | Radomir Dopieralski <devel@sheep.art.pl> |
|---|---|
| date | Tue, 03 Dec 2013 16:02:48 +0100 |
| parents | 9e1529bf0442 |
| children |
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import sqlite3 FIELD_MAX_WIDTH = 20 TABLE_NAME = 'people' SELECT = 'select * from %s order by age, name_last' % TABLE_NAME con = sqlite3.connect("mydb") cur = con.cursor() cur.execute(SELECT) # Print a header. for fieldDesc in cur.description: print(fieldDesc[0].ljust(FIELD_MAX_WIDTH), end=' ') print() # Finish the header with a newline. print('-' * 78) # For each row, print the value of each field left-justified within # the maximum possible width of that field. fieldIndices = range(len(cur.description)) for row in cur: for fieldIndex in fieldIndices: fieldValue = str(row[fieldIndex]) print(fieldValue.ljust(FIELD_MAX_WIDTH), end=' ') print() # Finish the row with a newline.
