a puzzle about GCPs

[lwk1542]

hi, Ma'am. I am a student in remote sensing. I am reading your book and it is great. I have a problem, now. the code and error follow:
from osgeo import gdal, osr
data=np.array([[1,2,3,4],[2,3,4,5],[3,3,7,8],[3,4,5,6]])

dst = r'F:\HY1C\data\test\kkkk.tif'
driver = gdal.GetDriverByName('GTiff')
dataset = driver.Create(dst,4,4, 1, gdal.GDT_Float32)
dataset.GetRasterBand(1).WriteArray(data)
dataset.FlushCache() # Write to disk.
ds=gdal.Open(dst,gdal.GA_Update)
sr=osr.SpatialReference()
sr.SetWellKnownGeogCS('WGS84')
longitude=[110,111,112,113]
latitude=[21,22,23,34]
columns=[1,2,3,4]
rows=[1,2,3,4]
gcps=[gdal.GCP(110,21,0,0,0),gdal.GCP(111,22,0,1,1),gdal.GCP(112,23,0,2,2),gdal.GCP(113,24,0,3,3)]

ds.SetGCPs(gcps,sr.ExportToWkt())
ds.SetProjection(sr.ExportToWkt())
ds=None
old_ds = gdal.Open(dst)
ds = old_ds.GetDriver().CreateCopy('cache2.tif', old_ds)
ds.SetProjection(sr.ExportToWkt())
ds.SetGeoTransform(gdal.GCPsToGeoTransform(gcps))
del ds, old_ds

TypeError Traceback (most recent call last)
in ()
27 ds = old_ds.GetDriver().CreateCopy('cache2.tif', old_ds)
28 ds.SetProjection(sr.ExportToWkt())
---> 29 ds.SetGeoTransform(gdal.GCPsToGeoTransform(gcps))
30
31 del ds, old_ds

D:\ProgramData\Anaconda3\lib\site-packages\osgeo\gdal.py in SetGeoTransform(self, *args)
1851 def SetGeoTransform(self, *args):
1852 """SetGeoTransform(Dataset self, double [6] argin) -> CPLErr"""
-> 1853 return _gdal.Dataset_SetGeoTransform(self, *args)
1854
1855

TypeError: not a sequence.

Is there any problem in my code causing this error? thanks for your help