有什么想法,我可以加入两个熊猫阵列在一个通常命名为tearray领域?源代码中的字段(Teradata)是一个实际的ByteArray,从Teradata的角度来看,这不能强制为字符或Teradata之外可用的内容)
Teradata导出可以很好地读入Panda的数组。但是我不能将两个表与一个通常命名的字段(DatabaseId)合并,而这个字段是bytearray。在
(以pd和itertools的形式进口熊猫)
当我尝试一个简单的合并:
merge1 = pd.merge(tvm, dbase, on="DatabaseId")
我得到的错误是:
^{pr2}$我搜索StackOverflow并找到一个similar problem for joining on a cell containing a collection
dbase['DBID'] = dbase.DatabaseId.apply(lambda r: type(sorted(r.iteritems())))
但我得到了一个错误:
AttributeError: 'bytearray' object has no attribute 'iteritems'
更新
数据示例 通过熊猫收集的数据
dbase = pd.read_sql('select databaseid, databasename from ud812.dbase sample 10', conn)
conn is a connection to a teradata database
Teradata中的数据类型对于所有列都是Varchar,除了:
DatabaseID = bytearray (Byte(4))
TVMID = bytearray (Byte(4))
>>> dbase.dtypes
DatabaseId object
DatabaseName object
dtype: object
>>> dbase
DatabaseId DatabaseName
0 [2, 0, 243, 185] PCDW_CRS_BBCONV3_TB
1 [2, 0, 168, 114] PAMLIF_TB
2 [2, 0, 133, 153] PADW_PRESN_TB
3 [2, 0, 29, 184] CEDW_MOBILE_TB
4 [2, 0, 190, 183] CEDW_MODEL_SCORE_TB
5 [2, 0, 71, 55] PBBBAM_TB
6 [2, 0, 169, 183] CEDW_OCC_TB
7 [2, 0, 201, 183] CCDW_DGTL_DEAL_TB
8 [0, 0, 139, 8] PRECDSS_TB
9 [2, 0, 142, 203] CDBDW_TB
>>>
>>>
>>> tvm.dtypes
TVMId object
DatabaseId object
TVMName object
TableKind object
CreateText object
dtype: object
>>> tvm
TVMId DatabaseId TVMName \
0 [230, 1, 41, 11, 0, 0] [2, 0, 67, 183] JCP_03538_112002
1 [214, 1, 60, 133, 0, 0] [2, 0, 186, 52] STL_AUTHNCTD_RULE_EXECN
2 [193, 2, 59, 48, 0, 0] [2, 0, 225, 150] uye177_Xsell_EM_OPCL_TB2
3 [0, 2, 235, 154, 0, 0] [2, 0, 244, 181] PL_CALCD_INVSTR_MTHLY_HIST_ST
4 [255, 1, 131, 76, 0, 0] [2, 0, 110, 63] IMH867_AVA0803_SNAP
5 [125, 1, 217, 138, 0, 0] [2, 0, 237, 153] FD_ACCT_STMT_ADR_ST
6 [224, 0, 80, 233, 0, 0] [2, 0, 243, 127] EXP_SRCH_RSLT_DESC
7 [208, 1, 72, 15, 0, 0] [2, 0, 8, 57] SGI_PAY_DENIED_SEP_112012
8 [246, 0, 27, 61, 0, 0] [2, 0, 143, 130] CR_INDIVD
9 [186, 1, 242, 167, 0, 0] [0, 0, 244, 18] wzu448_sb_apps
TableKind CreateText
0 T None
1 V CREATE VIEW ... ... ... ... ... ... ... ... ...
2 T None
3 V CREATE VIEW ... ... ... ... ... ... ... ... ...
4 T None
5 V CREATE VIEW ... ... ... ... ... ... ... ... ...
6 V CREATE VIEW ... ... ... ... ... ... ... ... ...
7 V CREATE VIEW ... ... ... ... ... ... ... ... ...
8 V CREATE VIEW ... ... ... ... ... ... ... ... ...
9 T None
将您的
bytearray
转换为它们不可变的表亲bytes
。在结果
^{pr2}$merge
是(我必须更改}将为空。我也没有包括
tvm
中某一行的DatabaseId
字段,否则{CreateText
列,这对SO来说太尴尬了)相关问题 更多 >
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