On 17/03/15 22:30, Doug Basberg wrote:
dataDict = {'Time': None, 'Vbatt': None, 'Ichrg': None, 'Vpanel': None}
vb = 51.25
ic = 5.89
vp = 55.78
i = 0
dataDict['Time'] = tymAsc
dataDict['Vbatt'] = vb
dataDict['Ichrg'] = ic
dataDict['Vpanel'] = vp
fn = 'testData01.dat'
f = open(fn, 'ab')
I don;t believe json needs a binary file.
Also do you really want to append data?
for i in xrange(5):
json.dump(dataDict, f)
# f.write(str(dataDict))
# f.write('\n\r')
tymAsc = t.asctime(t.localtime())
dataDict['Time'] = tymAsc
dataDict['Vbatt'] = vb + i
dataDict['Ichrg'] = ic + i
dataDict['Vpanel'] = vp + i
f.close()
print('*********** done ********** \n\r')
You are effectively creating 5 separate dictionaries in your json file.
fn = 'testData01.dat'
f = open(fn, 'r')
dataDict = json.load(f)
f.close()
But you only read one back
Traceback (most recent call last):
File "C:/Python27/myTestRcv00.py", line 17, in <module>
dataDict = json.load(f)
File "C:\Python27\lib\json\__init__.py", line 290, in load
**kw)
File "C:\Python27\lib\json\__init__.py", line 338, in loads
return _default_decoder.decode(s)
File "C:\Python27\lib\json\decoder.py", line 368, in decode
raise ValueError(errmsg("Extra data", s, end, len(s)))
ValueError: Extra data: line 1 column 85 - line 1 column 421 (char 84 - 420)
Python is therefore confused.
Try your experiment using just one dictionary in and one dictionary out.
Once you have that working write multiple dictionaries and then read
them back.
Incidentally, you can check the content of your json file by opening
it in a text editor, it is a human readable format.
--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.amazon.com/author/alan_gauld
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