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logg.hint(
'This might be very slow. Consider passing `cache=True`, '
'which enables much faster reading from a cache file.'
)
# do the actual reading
if ext == 'xlsx' or ext == 'xls':
if sheet is None:
raise ValueError(
"Provide `sheet` parameter when reading '.xlsx' files."
)
else:
adata = read_excel(filename, sheet)
elif ext in {'mtx', 'mtx.gz'}:
adata = read_mtx(filename)
elif ext == 'csv':
adata = read_csv(filename, first_column_names=first_column_names)
elif ext in {'txt', 'tab', 'data', 'tsv'}:
if ext == 'data':
logg.hint(
"... assuming '.data' means tab or white-space "
'separated text file',
)
logg.hint('change this by passing `ext` to sc.read')
adata = read_text(filename, delimiter, first_column_names)
elif ext == 'soft.gz':
adata = _read_softgz(filename)
elif ext == 'loom':
adata = read_loom(filename=filename, **kwargs)
else:
raise ValueError(f'Unknown extension {ext}.')
if cache:
logg.info(