python递归函数和返回非可变字典

Question

I'm trying to make function VisitAllObjects accept different files and return a dictionary. But what I have currently points to the same name? So once gdata is ran, fdata changes to gdata. How can I make it so fdata and gdata equal their respected data from their gh5 files?

f = h5py.File('testfile.gh5', 'r')
g = h5py.File('testfile2.gh5', 'r')

def VisitAllObjects(Group,Path, FileInfo=None):
    if FileInfo is None:
        FileInfo = {}
    for i in Group.items():
        if isinstance(i[1], h5py.Group):
            VisitAllObjects(i[1], Path + '/' + i[0])
        else:
            DatasetName = Path + '/' + i[0]
            FileInfo[DatasetName] = (Group[DatasetName].shape, Group[DatasetName].dtype)
    return FileInfo

fdata = VisitAllObjects(f,'')
gdata = VisitAllObjects(g,'')

With your help and adding file_info when calling visit_all_objects within itself I was able to get this to work. If you see any problems with this please let me know, I still need to check it more but using fdata and gdata come back with different data and fdata is gdata is False. Thanks.

I got it to work with the following:

def visit_all_objects(Group,Path, file_info=None):
    if file_info is None:
        file_info = {}
    for i in Group.items():
        if isinstance(i[1], h5py.Group):
            visit_all_objects(i[1], Path + '/' + i[0], file_info)
        else:
            DatasetName = Path + '/' + i[0]
            file_info[DatasetName] = (Group[DatasetName].shape, Group[DatasetName].dtype)
    return file_info

Answer 1

Instead of mutating the dictionary, try making a new one, and mutating that. You could do that by putting FileInfo = FileInfo.copy() near the top of the function, right after you handle the case where FileInfo is None .