当前表结构：
store.get_storer('stocks').table
Out[65]:
/stocks/table (Table(26543,)) ''
description := {
"index": Int64Col(shape=(), dflt=0, pos=0),
"values_block_0": Float64Col(shape=(4,), dflt=0.0, pos=1),
"values_block_1": Int64Col(shape=(1,), dflt=0, pos=2),
"Name": StringCol(itemsize=40, shape=(), dflt=b'', pos=3),
"Code": StringCol(itemsize=8, shape=(), dflt=b'', pos=4),
"Date": Int64Col(shape=(), dflt=0, pos=5)}
byteorder := 'little'
chunkshape := (630,)
autoindex := True
colindexes := {
"index": Index(6, medium, shuffle, zlib(1)).is_csi=False,
"Name": Index(6, medium, shuffle, zlib(1)).is_csi=False,
"Code": Index(6, medium, shuffle, zlib(1)).is_csi=False,
"Date": Index(6, medium, shuffle, zlib(1)).is_csi=False}
我尝试检查某个日期的索引是否存在：我的第一次尝试抛出语法错误：
tod = dt.datetime.today().date()
store = pd.HDFStore(f'{wkd}Database.h5)
df = store.select('stocks', f'Date={tod}')
if len(df) > 0:
print('Found something!')
与这段代码相同的错误：
g = store.get_storer('stocks')
g.read_axes(f'Date={lastday}')
这是错误消息：
File "<ipython-input-13-0cbe359284fa>", line 1, in <module>
g.read_axes(f'Date={lastday}')
File "path2venv/lib/python3.8/site-packages/pandas/io/pytables.py", line 3665, in read_axes
self.selection = Selection(self, where=where, **kwargs)
File "path2venv/lib/python3.8/site-packages/pandas/io/pytables.py", line 5003, in __init__
self.terms = self.generate(where)
File "path2venv/lib/python3.8/site-packages/pandas/io/pytables.py", line 5016, in generate
return Expr(where, queryables=q, encoding=self.table.encoding)
File "path2venv/lib/python3.8/site-packages/pandas/core/computtion/pytables.py", line 551, in __init__
self.terms = self.parse()
File "path2venv/lib/python3.8/site-packages/pandas/core/computation/expr.py", line 847, in parse
return self._visitor.visit(self.expr)
File "path2venv/lib/python3.8/site-packages/pandas/core/computation/expr.py", line 437, in visit
raise e
File "path2venv/lib/python3.8/site-packages/pandas/core/computation/expr.py", line 431, in visit
node = ast.fix_missing_locations(ast.parse(clean))
File "/usr/lib64/python3.8/ast.py", line 47, in parse
return compile(source, filename, mode, flags,
File "<unknown>", line 1
Date ==2020 -0 3 -0 7
如何将日期传递给查询？有没有更好的方法来检查索引列？
编辑：也许是个错误？
最后我找到了一个简单的解决方案：
df = store.select('stocks', f'Date=Timestamp("{tod}")')