guys, how would i do this: i want to read from a text file
the text file should contain should contain data (say, decimal value
from 1-1200). there should be no other type of entry but decimal
it should contain 96 data all in all, with each data separated by a
comma or each data is numbered from 1-96 (or better yet, any
suggestions on this???)
Hi,
So, you have control over the creation of the data file, too? Is it being created by a Python process? If so, pickling your data might make more sense. If the data was generated by a class with each data point stored as a class attribute, for instance, you could just pickle the class. Does this sound possible in your situation?
now, the program should read each data every 5 minutes for eight hours the data will be sent to the serial port and will be executed by an external hardware. the serial part is ok, and the problem now is how to read from a text file. any help, pls.
what i know (chapter 7 of the tutorial): 1) first, to open a txt file, i can use open() say: f = open(*.txt, r) a user can use the notepad to create the text file so i'll just open it for reading. my problem now would be on reading the contents of the file. 2) f.read(size), since my data ranges from 0-1200, size = 2 for each read. 3) should i do this: for data in range (1, 96,1): f.read(2) ... time.sleep(300) # 5 minutes 4) since f.read() returns string, how would i convert this back to decimal value, since i would need the decimal value for the serial part.
Since you files are quite short, I'd do something like:
<code> data_file = open(thedata.txt, 'r') # note -- 'r' not r data = data_file.readlines() # returns a list of lines
def process(list_of_lines):
data_points = []
for line in list_of_lines:
data_points.append(int(line))
return data_pointsprocess(data) </code>
This assumes that each line of the data file has nothing but a string with an int followed by '\n' (for end of line), and that all you need is a list of those integers. Maybe these are bad assumptions -- but they might get you started.
HTH,
Brian vdB
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