ValueError: could not convert string to float: E-3 [duplicate] - database

Question

This question already has answers here:
Issue querying from Access database: "could not convert string to float: E+6"
(3 answers)
Closed 7 years ago.
I am trying to access some of the columns in a Microsoft Access database table which contains numbers of type double but I am getting the error mentioned in the title.The code used for querying the database is as below, the error is occurring in the line where cur.execute(....) command is executed. Basically I am trying filter out data captured in a particular time interval. If I exclude the columns CM3_Up, CG3_Up, CM3_Down, CG3_Down which contains double data type in the cur.execute(....) command I wont get the error. Same logic was used to access double data type from other tables and it worked fine, I am not sure what is going wrong.
Code:
start =datetime.datetime(2015,03,28,00,00)
a=start
b=start+datetime.timedelta(0,240)
r=7
while a < (start+datetime.timedelta(1)):
params = (a,b)
sql = "SELECT Date_Time, CM3_Up, CG3_Up, CM3_Down, CG3_Down FROM
Lysimeter_Facility_Data_5 WHERE Date_Time >= ? AND Date_Time <= ?"
for row in cur.execute(sql,params):
if row is None:
continue
r = r+1
ws.cell(row = r,column=12).value = row.get('CM3_Up')
ws.cell(row = r,column=13).value = row.get('CG3_Up')
ws.cell(row = r,column=14).value = row.get('CM3_Down')
ws.cell(row = r,column=15).value = row.get('CG3_Down')
a = a+five_min
b = b+five_min
wb.save('..\SE_SW_Lysimeters_Weather_Mass_Experiment-02_03_26_2015.xlsx')
Complete error report:
Traceback (most recent call last):
File "C:\DB_PY\access_mdb\db_to_xl.py", line 318, in <module>
for row in cur.execute(sql,params):
File "build\bdist.win32\egg\pypyodbc.py", line 1920, in next
row = self.fetchone()
File "build\bdist.win32\egg\pypyodbc.py", line 1871, in fetchone
value_list.append(buf_cvt_func(alloc_buffer.value))
ValueError: could not convert string to float: E-3

Answer 1

As to this discussion:
Python: trouble reading number format
the trouble could be that e should be d, like:
float(row.get('CM3_Up').replace('E', 'D'))
Sounds weird to me though, but I know only little of Python.

Answer 2

It sounds like you receive strings like '2.34E-3', so try with a conversion. Don't know Python, but in C# it could be like:
ws.cell(row = r,column=12).value = Convert.ToDouble(row.get('CM3_Up'))
ws.cell(row = r,column=13).value = Convert.ToDouble(row.get('CG3_Up'))
ws.cell(row = r,column=14).value = Convert.ToDouble(row.get('CM3_Down'))
ws.cell(row = r,column=15).value = Convert.ToDouble(row.get('CG3_Down'))