I have 3 column (DM1_ID, DM2_ID, pairs) pandas dataframe with 1 million records.Also, I have a dictionary containing key and multiple values. The function check the dictionary values and get the key and put that key in new_ID field. Function working fine for small part of pandas dataframe but when I applied it to whole dataframe it'll giving me "StopIteration" error.
DM1_ID DM2_ID pairs
86503 11945.0 11945.0 [11945.0, 11945.0]
86504 11945.0 362380.0 [11945.0, 362380.0]
86505 11945.0 538395.0 [11945.0, 538395.0]
86506 538395.0 591587.0 [11945.0, 591587.0]
86507 11946.0 11946.0 [11946.0, 11946.0]
86508 362380.0 200589 [362380.0, 200589.0]
86509 564785.0 11946.0 [564785.0, 11946.0]
f = lambda x: next(k for k,v in jdic.items() if any(i in v for i in x))
jdic = {10045: [1, 6, 7,10045, 15, 45, 55, 80], 11945: [11945, 362380,20589, 10, 27, 538395, 591587], 3: [3, 21, 28, 32, 35], 11946: [11946, 39, 564785]}
largeFile13000['new_ID'] = largeFile13000['pairs'].apply(f)
largeFile13000.drop('pairs', axis=1, inplace=True)
largeFile13000.head()
# final result I'm expecting is
DM1_ID DM2_ID new_ID
86503 11945.0 11945.0 11945
86504 11945.0 362380.0 11945
86505 11945.0 538395.0 11945
86506 538395.0 591587.0 11945
86507 11946.0 11946.0 11946
86508 362380.0 200589 11945
86509 564785.0 11946.0 11946
# error
StopIteration Traceback (most recent call last)
<ipython-input-14-ddbcd19d6baa> in <module>
----> 1 largeFile13000['new_ID'] = largeFile13000['pairs'].apply(f)
2 largeFile13000.drop('pairs', axis=1, inplace=True)
3 largeFile13000.head()
c:\users\ravindu\appdata\local\programs\python\python37\lib\site-packages\pandas\core\series.py in apply(self, func, convert_dtype, args, **kwds)
3589 else:
3590 values = self.astype(object).values
-> 3591 mapped = lib.map_infer(values, f, convert=convert_dtype)
3592
3593 if len(mapped) and isinstance(mapped[0], Series):
pandas\_libs\lib.pyx in pandas._libs.lib.map_infer()
<ipython-input-12-b4ce01c34c30> in <lambda>(x)
----> 1 f = lambda x: next(k for k,v in jdic.items() if any(i in v for i in x))
StopIteration:
Does any one could help me to resolve this issue? Thanks in advance.
From your data, essentially you just need to look up one column, say "DM1_ID", as the corresponding "DM2_ID" should belong to the same key in jdic. In this case, it's quite easy to do. I would just reverse your dictionary.
jdic = {10045: [1, 6, 7,10045, 15, 45, 55, 80], 11945: [11945, 362380,20589, 10, 27, 538395, 591587], 3: [3, 21, 28, 32, 35], 11946: [11946, 39, 564785]}
ndic = {}
for key in jdic:
for i in jdic[key]:
ndic[i] = key
And then apply the condition.
largeFile13000['new_ID'] = largeFile13000['DM1_ID'].apply(lambda x: ndic[x])
By the way, I don't know whether you have any specific reasons to construct the dictionary jdic in that way. For this apparently many-to-one relationship, it's much better to use the 'many' side as the key.