python - Pandas to_sql threading error -


i'm trying adapt use of threading script writeback sql table

https://github.com/haolu23/misc/blob/master/tosql.py

i managed make work initially, when wanted processing prior writing back, gets load 100 records first chunk, , class 'typeerror' on log. i'm not familiar threading , need help.

def processdata(df, *args, **kargs):     df = fxn1(df,param1,param2,param3,param4)     df = fxn2(df,param1,param2,param3,param4)     df = fxn3(df,param1,param2,param3,param4)     df.to_sql(*args, **kargs)  try:     import threading      def tosql(df, *args, **kargs):         chunksize = 1000         initial_chunk = 100         if len(df) > chunksize:             df.iloc[:initial_chunk, :].to_sql(*args, **kargs)             processdata(df.iloc[:initial_chunk, :],*args, **kargs)         if kargs['if_exists'] == 'replace':             kargs['if_exists'] = 'append'         workers = []         in range((len(df) - initial_chunk)//chunksize):             t = threading.thread(target=lambda: processdata(df.iloc[initial_chunk+i*chunksize:initial_chunk+(i+1)*chunksize, :],*args, **kargs))             t.start()             workers.append(t)                        processdata(df.iloc[initial_chunk+i*chunksize:initial_chunk+(i+1)*chunksize, :],*args, **kargs)             [t.join() t in workers]      engine = sqlconnect()        tosql(df, tblname, engine, schema=sc, index=false, if_exists="append") except:     print(sys.exc_info()[0])


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