END in file after f.write ?!

[hhanswurster]

Hey Guys,

i try to log some settings every time my script runs.

# write log entry
f = open("/media/pi/6CD8-2DB41/images/log/log.txt","a")
f.write("\n" + str(newest) +" " + str(g_f) + " " + str(g_iso)+ " " + str(luxvis) + " " + str(fiso) + " " + str(output[-1]))
f.close()

print "wrote log"

output after severl runs:

2018_06_30_20_25_25.arw 8.0 400 48 2 8/10
END
2018_06_30_20_30_19.arw 8.0 250 47 2 10/10
END
2018_06_30_20_35_17.arw 8.0 250 47 2 10/10
END
2018_06_30_20_40_18.arw 8.0 250 46 2 10/10
END
2018_06_30_20_45_17.arw 8.0 250 45 2 13/10
END
2018_06_30_20_50_19.arw 8.0 250 40 2 13/10
END
2018_06_30_20_55_19.arw 8.0 250 38 2 13/10
END
2018_06_30_21_00_19.arw 8.0 250 38 2 13/10
END
2018_06_30_21_05_23.arw 8.0 250 24 2 32/10
END
2018_06_30_21_10_22.arw 8.0 250 23 2 32/10
END
2018_06_30_21_15_21.arw 8.0 250 23 2 32/10

all looks good, but i dont want the "END" ?! anyone knows were this is comming from?

[ljmetzger]

My speculation is that '\nEND' is part of one of your variables since you provided incomplete code.

See the following code example:

# write log entry
output = "uuuuu"
f = open("aaa.txt","a")
f.write("\n" +  "xxx " + str(output[-1]))
f.close()
 
print "wrote log"

Output:
xxx u
xxx u
xxx u
xxx u

When you have a problem like this, one of the easiest ways to solve the problem is to start with something that is known to work, and then start adding additional items one at a time. Don't be afraid to write lots of extra things either to the log file or the the screen with a 'print' statement as debugging/diagnostic tools.

Lewis

[Larz60+]

also, the method can be improved:

with open('log.txt', 'a') as log:
    log.write('\n{} {} {} {} {} {}'.format(newest, g_f, g_iso, luxvis, fiso, output[-1]))

print('wrote log') 

if you are using python 3.6 or newer, you can replace the write with:

log.write(f'\n{newest} {g_f} {g_iso} {luxvis} {fiso} {output[-1]}')

[hhanswurster]

@ljmetzger
you were right :)
problem is the output[-1] variable.

i do this this way:

# get current shutterspeed from camera
command = check_output(["/usr/local/bin/gphoto2","--get-config","/main/capturesettings/shutterspeed"])
output = command.decode().strip()
output = output.split(' ')

output of gphotot2 is:

pi@raspberry:~ $ gphoto2 --get-config /main/capturesettings/shutterspeed
Label: Shutter Speed
Readonly: 0
Type: RADIO
Current: 1/1250
END
pi@raspberry:~

the splitted output:

[u'Label:', u'Shutter', u'Speed\nReadonly:', u'0\nType:', u'RADIO\nCurrent:', u'1/1250\nEND']

i only need the "1/1250".

any other idea than "str(output[-1]" ?

[ljmetzger]

I am assuming gphoto2 is the contents of your file, which I simulated using a string. I converted the contents of the string into a dictionary, using a colon : as the parse character.

I am relatively new to Python, so I imagine there is a more efficient way to do this.

mydata = """pi@raspberry:~ $ gphoto2 --get-config /main/capturesettings/shutterspeed
Label: Shutter Speed
Readonly: 0
Type: RADIO
Current: 1/1250
END xxxx
pi@raspberry:~ """

# Data as string
print(type(mydata))
print(mydata)

#Convert data to a list
mydata = mydata.split("\n")
print("")
print("")
print(type(mydata), len(mydata))
print(mydata)

#Convert data to a dictionary
mydict = {}
for row in mydata:
     try:
         mystring = row.split(":")
         mydict[mystring[0]] = mystring[1]
     except:
         pass
         
print("")
print("")
print("Dictionary follows:")         
print(type(mydict), len(mydict))
print(mydict)

# Get 'Shutter speed' from the dictionary
print("")
shutter_speed = mydict.get('Current', 'There is no Shutter speed')
print("Shutter speed = {}.".format(shutter_speed))

Output:
<class 'str'>
pi@raspberry:~ $ gphoto2 --get-config /main/capturesettings/shutterspeed
Label: Shutter Speed
Readonly: 0
Type: RADIO
Current: 1/1250
END xxxx
pi@raspberry:~


<class 'list'> 7
['pi@raspberry:~ $ gphoto2 --get-config /main/capturesettings/shutterspeed', 'Label: Shutter Speed', 'Readonly: 0', 'Type: RADIO', 'Current: 1/1250', 'END xxxx', 'pi@raspberry:~ ']


Dictionary follows:
<class 'dict'> 5
{'pi@raspberry': '~ ', 'Label': ' Shutter Speed', 'Readonly': ' 0', 'Type': ' RADIO', 'Current': ' 1/1250'}

Shutter speed =  1/1250.

NOTE: In the following line, the 'no shutter speed text' is returned if the dictionary key value Current does not exist.

shutter_speed = mydict.get('Current', 'There is no Shutter speed')

Lewis