def make_col(row_type, row_name, row_item, str_len):
'''for strings it will always make at least 80 char or twice mac char size'''
set_len = 80
if str_len:
if 2 * str_len > set_len:
set_len = 2 * str_len
row_type[row_name] = tables.Col("CharType", set_len)
else:
type_matrix = {
int: tables.Col("Int32", 1),
float: tables.Col("Float32", 4), #Col("Int16", 1)
}
row_type[row_name] = type_matrix[type(row_item)]
def add_cache(fileh, cache):
group_name = 'pytables_cache_v0'
table_name = 'cache0'
root = fileh.root
group_obj = fileh.createGroup(root, group_name)
cache_str = cPickle.dumps(cache, 0)
cache_str = cache_str.replace('\n', chr(1))
cache_pieces = []
while cache_str:
cache_part = cache_str[:8000]
cache_str = cache_str[8000:]
if cache_part:
cache_pieces.append(cache_part)
row_type = {}
row_type['col_0'] = tables.Col("CharType", 8000)
#
table_cache = fileh.createTable(group_obj,
table_name,
row_type,
'H',
compress=1)
for piece in cache_pieces:
print len(piece)
table_cache.row['col_0'] = piece
table_cache.row.append()
table_cache.flush()