Resolved - TypeError: Can't implicitly convert non-string objects to strings

When trying to save my adata object:

adata_query_final.write_h5ad("anndata_objects/3_pcls_adata_with_scArches_labels_20240215.h5ad")

I received the following error:

TypeError: Can't implicitly convert non-string objects to strings

Error raised while writing key 'ann_level_2_transfer_uncert' of <class 'h5py._hl.group.Group'> to /

I have these columns in obs matrix which are supposed to float but some mix up there different type of variables for which I could not save the object.

       'ann_level_1_transfer_uncert', 'ann_level_2_transfer_uncert',
       'ann_level_3_transfer_uncert', 'ann_level_4_transfer_uncert',
       'ann_level_5_transfer_uncert',

I checked the type of the variable in the columns using below command:

print(adata_query_final.obs['ann_level_1_transfer_uncert'].apply(type).value_counts())

ann_level_1_transfer_uncert
<class 'numpy.float64'>    11075
<class 'int'>               1754
<class 'float'>               78
Name: count, dtype: int64

Converted all the columns to float with command below:

adata_query_final.obs['ann_level_1_transfer_uncert'] = adata_query_final.obs['ann_level_1_transfer_uncert'].astype(float)
adata_query_final.obs['ann_level_2_transfer_uncert'] = adata_query_final.obs['ann_level_2_transfer_uncert'].astype(float)
adata_query_final.obs['ann_level_3_transfer_uncert'] = adata_query_final.obs['ann_level_3_transfer_uncert'].astype(float)
adata_query_final.obs['ann_level_4_transfer_uncert'] = adata_query_final.obs['ann_level_4_transfer_uncert'].astype(float)
adata_query_final.obs['ann_level_5_transfer_uncert'] = adata_query_final.obs['ann_level_5_transfer_uncert'].astype(float)

Now, i can save the adata without an issue:

adata_query_final.write_h5ad("anndata_objects/3_pcls_adata_with_scArches_labels_20240215.h5ad")