Python SqlAlchemy | Issue on CSV bulk insert in MySQL

I'm beginner of "Python with sqlAlchemy".

I try to insert my bulk CSV data's to MySQL by using the following,

My Code :

import pandas as pd 
from sqlalchemy import create_engine

df = pd.read_csv('/home/shankar/LAB/Python/company_bi.csv')
# 2nd argument replaces where conditions is False
df = df.where(pd.notnull(df), None) 
df.head()
conn_str = "mysql+pymysql://root:*****@localhost/globalTracker?charset=utf8&use_unicode=0"

engine = create_engine(conn_str)

conn = engine.raw_connection()

df.to_sql(name='company', con=conn, 
      if_exists='append',
      chunksize=10000, dtype=object,
      index_label='SOS_VOTERID')
conn.close()

NOTE : In Some cases, another CSV files are working, but some of them not imported properly due to Encoding issues. Even tried "dtype" as "mysql", also i get the same.

Error I Got :

AttributeError                            Traceback (most recent call last)
<ipython-input-7-0c08d4874fc0> in <module>()
 12           if_exists='append',
 13           chunksize=10000, dtype=object,
---> 14           index_label='SOS_VOTERID')
 15 conn.close()

 /home/shankar/.local/lib/python3.5/site-packages/pandas/core/generic.py in to_sql(self, name, con, flavor, schema, if_exists, index, index_label, chunksize, dtype)
 1163         sql.to_sql(self, name, con, flavor=flavor, schema=schema,
 1164                    if_exists=if_exists, index=index, index_label=index_label,
 -> 1165                    chunksize=chunksize, dtype=dtype)
 1166 
 1167     def to_pickle(self, path):

 /home/shankar/.local/lib/python3.5/site-packages/pandas/io/sql.py in to_sql(frame, name, con, flavor, schema, if_exists, index, index_label, chunksize, dtype)
 569     pandas_sql.to_sql(frame, name, if_exists=if_exists, index=index,
 570                       index_label=index_label, schema=schema,
 --> 571                       chunksize=chunksize, dtype=dtype)
 572 
 573 

 /home/shankar/.local/lib/python3.5/site-packages/pandas/io/sql.py in to_sql(self, frame, name, if_exists, index, index_label, schema, chunksize, dtype)
 1651         """
 1652         if dtype is not None:
 -> 1653             for col, my_type in dtype.items():
 1654                 if not isinstance(my_type, str):
 1655                     raise ValueError('%s (%s) not a string' % (

 AttributeError: type object 'object' has no attribute 'items'

Kindly Notify my Bug ...

Thanks in Advance.