pandas.HDFStore.walk — pandas 2.2.3 documentation (original) (raw)

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()