pandas.HDFStore.walk#

HDFStore.walk(where='/')[source]#

Walk the pytables group hierarchy for pandas objects.

This generator will yield the group path, subgroups and pandas object names for each group.

Any non-pandas PyTables objects that are not a group will be ignored.

The where group itself is listed first (preorder), then each of its child groups (following an alphanumerical order) is also traversed, following the same procedure.

Parameters:

wherestr, default “/”: Group where to start walking.

Yields:

pathstr: Full path to a group (without trailing ‘/’).
groupslist: Names (strings) of the groups contained in path.
leaveslist: Names (strings) of the pandas objects contained in path.

Examples

>>> df1 = pd.DataFrame([[1, 2], [3, 4]], columns=['A', 'B'])
>>> store = pd.HDFStore("store.h5", 'w')  
>>> store.put('data', df1, format='table')  
>>> df2 = pd.DataFrame([[5, 6], [7, 8]], columns=['A', 'B'])
>>> store.append('data', df2)  
>>> store.close()  
>>> for group in store.walk():  
...     print(group)  
>>> store.close()  