mysql float64,'numpy.float64'对象没有属性'translate'将值插入Python中的Mysql
import dataset
db = dataset.connect(....)
table = db[...]
When I try to insert some value into Mysql table, this error occurred.
Sample Value I am inserting to the table:
print("Buy", ticker, price, date, OType, OSize)
Buy AAPL 93.4357142857 2016-05-12 Market 200
data = dict(Order_Side='Buy',Ticker=ticker, Price=price,
Order_Date= date, Order_Type = OType, Volume = OSize )
table.insert(data)
error message:
Traceback (most recent call last):
File "", line 1, in
runfile('C:/Users/SwigelUser/Documents/GitHub/Trading/Strategies/strat_MA_ExecTest.py', wdir='C:/Users/SwigelUser/Documents/GitHub/Trading/Strategies')
File "C:\Users\SwigelUser\Anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py", line 880, in runfile
execfile(filename, namespace)
File "C:\Users\SwigelUser\Anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py", line 102, in execfile
exec(compile(f.read(), filename, 'exec'), namespace)
File "C:/Users/SwigelUser/Documents/GitHub/Trading/Strategies/strat_MA_ExecTest.py", line 69, in
MA_Stra(start_length=7,end_length=10,start_date=date(2016,5,12),end_date=date(2016,6,18))
File "C:/Users/SwigelUser/Documents/GitHub/Trading/Strategies/strat_MA_ExecTest.py", line 66, in MA_Stra
table.insert(data1)
File "C:\Users\SwigelUser\Anaconda3\lib\site-packages\dataset\persistence\table.py", line 87, in insert
res = self.database.executable.execute(self.table.insert(row))
File "C:\Users\SwigelUser\Anaconda3\lib\site-packages\sqlalchemy\engine\base.py", line 945, in execute
return meth(self, multiparams, params)
File "C:\Users\SwigelUser\Anaconda3\lib\site-packages\sqlalchemy\sql\elements.py", line 263, in _execute_on_connection
return connection._execute_clauseelement(self, multiparams, params)
File "C:\Users\SwigelUser\Anaconda3\lib\site-packages\sqlalchemy\engine\base.py", line 1053, in _execute_clauseelement
compiled_sql, distilled_params
File "C:\Users\SwigelUser\Anaconda3\lib\site-packages\sqlalchemy\engine\base.py", line 1189, in _execute_context
context)
File "C:\Users\SwigelUser\Anaconda3\lib\site-packages\sqlalchemy\engine\base.py", line 1405, in _handle_dbapi_exception
util.reraise(*exc_info)
File "C:\Users\SwigelUser\Anaconda3\lib\site-packages\sqlalchemy\util\compat.py", line 187, in reraise
raise value
File "C:\Users\SwigelUser\Anaconda3\lib\site-packages\sqlalchemy\engine\base.py", line 1182, in _execute_context
context)
File "C:\Users\SwigelUser\Anaconda3\lib\site-packages\sqlalchemy\engine\default.py", line 470, in do_execute
cursor.execute(statement, parameters)
File "C:\Users\SwigelUser\Anaconda3\lib\site-packages\pymysql\cursors.py", line 164, in execute
query = self.mogrify(query, args)
File "C:\Users\SwigelUser\Anaconda3\lib\site-packages\pymysql\cursors.py", line 143, in mogrify
query = query % self._escape_args(args, conn)
File "C:\Users\SwigelUser\Anaconda3\lib\site-packages\pymysql\cursors.py", line 123, in _escape_args
return dict((key, conn.literal(val)) for (key, val) in args.items())
File "C:\Users\SwigelUser\Anaconda3\lib\site-packages\pymysql\cursors.py", line 123, in
return dict((key, conn.literal(val)) for (key, val) in args.items())
File "C:\Users\SwigelUser\Anaconda3\lib\site-packages\pymysql\connections.py", line 821, in literal
return self.escape(obj, self.encoders)
File "C:\Users\SwigelUser\Anaconda3\lib\site-packages\pymysql\connections.py", line 814, in escape
return escape_item(obj, self.charset, mapping=mapping)
File "C:\Users\SwigelUser\Anaconda3\lib\site-packages\pymysql\converters.py", line 27, in escape_item
val = encoder(val, mapping)
File "C:\Users\SwigelUser\Anaconda3\lib\site-packages\pymysql\converters.py", line 110, in escape_unicode
return u"'%s'" % _escape_unicode(value)
File "C:\Users\SwigelUser\Anaconda3\lib\site-packages\pymysql\converters.py", line 73, in _escape_unicode
return value.translate(_escape_table)
AttributeError: 'numpy.float64' object has no attribute 'translate'
What have caused this error? How could I solve this.
It seems like I entered too much code here,thus I will have to type lots of none sense in order to submit.
my price and date variable comes from a dataframe:
for i in range(len(All_Tickers)-1-len(Current_Date),len(All_Tickers)-1):
price = All_Tickers[str(length) + 'day_MA'][i]
date = All_Tickers['Date'][i+1]
According to the answer below, the problem should be the type of price is np.float64, how can I convert this variable to type float?
解决方案
Your library tries to format the provided arguments to a format MySQL will understand. To do so, it checks the type of each argument, to determine how the input should be formatted.
However, since your lib doesn't knows numpy.float64, it fallbacks to a default encoder, which happens to be one for strings (unicode). Here is the relevent piece of code.
def escape_item(val, charset, mapping=None):
if mapping is None:
mapping = encoders
encoder = mapping.get(type(val))
# Fallback to default when no encoder found
if not encoder:
try:
encoder = mapping[text_type]
except KeyError:
raise TypeError("no default type converter defined")
if encoder in (escape_dict, escape_sequence):
val = encoder(val, charset, mapping)
else:
val = encoder(val, mapping)
return val
This encoder, assuming the input is indeed a string, tries to call the translate() method on this string. But, since this method isn't defined for float64, you get this error.
You should try to convert your float64 to a regular float.
Or, you can create your own encoder, and add it in the encoders dict used as the default mapping of python types to encoder. If you're going to use a lot this lib with float64, it may be worth doing.