rdkit.Chem.rdmolfiles.MolToMolBlock(NoneType) 中的 Python 参数类型

我正在try 使用rdkit python库将inchi转换为sdf格式.我正在运行以下一行python代码.

#convert inchi to sdf

def MolFromInchi(id,inchi):
    mol = Chem.MolFromInchi(inchi)
    mol_block = Chem.MolToMolBlock(mol)
    print (id, mol_block)
    print ('$$$$')
    
with open (r'C:/Users/inchi_canonize') as f:                                                                                   
    for line in f:
        lst=line.split(' ')
        elements = [x for x in lst if x]   #remove empty elements and get id (elements[0]) and inchis (elements[1])
        elements[1] = ('\''+elements[1].strip()+'\'')
        id = elements[0]
        inchi = elements[1].rstrip("\n")
        print (inchi)
        MolFromInchi(id,inchi)

输入文件(inchi_canonize)有以下字段.

D08520   InChI=1S/C10H18O2/c1-7-4-5-8(6-9(7)11)10(2,3)12/h4,8-9,11-12H,5-6H2,1-3H3                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
D07548   InChI=1S/C17H25NO4.ClH/c1-20-13-11-15(21-2)17(16(12-13)22-3)14(19)7-6-10-18-8-4-5-9-18;/h11-12H,4-10H2,1-3H3;1H                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
D10000   (null)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     

以下是错误:

ArgumentError: Python argument types in
    rdkit.Chem.rdmolfiles.MolToMolBlock(NoneType)
did not match C++ signature:
    MolToMolBlock(class RDKit::ROMol mol, bool includeStereo=True, int confId=-1, bool kekulize=True, bool forceV3000=False)

非常感谢您的帮助