Mercurial > cpython-lru_cache-weakref

annotate Doc/includes/sqlite3/simple_tableprinter.py @ 87690:66c1c9f32567 default tip

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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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
42604
9e1529bf0442 Move the 3k reST doc tree in place.
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1 import sqlite3
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2
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3 FIELD_MAX_WIDTH = 20
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4 TABLE_NAME = 'people'
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5 SELECT = 'select * from %s order by age, name_last' % TABLE_NAME
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6
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7 con = sqlite3.connect("mydb")
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8
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9 cur = con.cursor()
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10 cur.execute(SELECT)
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11
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12 # Print a header.
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13 for fieldDesc in cur.description:
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14 print(fieldDesc[0].ljust(FIELD_MAX_WIDTH), end=' ')
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15 print() # Finish the header with a newline.
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16 print('-' * 78)
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17
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18 # For each row, print the value of each field left-justified within
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19 # the maximum possible width of that field.
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20 fieldIndices = range(len(cur.description))
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21 for row in cur:
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22 for fieldIndex in fieldIndices:
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23 fieldValue = str(row[fieldIndex])
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24 print(fieldValue.ljust(FIELD_MAX_WIDTH), end=' ')
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25
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26 print() # Finish the row with a newline.