File write and read

[priis]

I save data from the sensors of the pysense board with

filename='log/espdata.csv'
datafile=open(filename,'w')
datafile.write(......

and it seems to work.

However, I get no results when I try to read the data:

espfile=open('log/epsdata.csv','r')
data=epsfile.read()
epsfile.close()
print(data)

What am I doing wrong?

[robert-hh]

@priis In the first example you forgot to close the file. The with clause in the second example is doing that for you. So no need to close there.
P.S.: When you enclose your code in lines with three backticks (```), then it is printed as such.

[priis]

Well, this seems to work:

with open('datafile.csv', 'w') as datafile:
    datafile.write("Hello!\n")
    for i in range(0,3):
        datafile.write(str(i)+','+str(i*i)+'\n')
datafile.close()
print('Datafile written.')

with open('datafile.csv') as datafile:
    print(datafile.read())
datafile.close()
print('Datafile read.')