NoneType' object has no attribute 'write'

[m.t....@student.rug.nl]

Hello everyone,

I am struggling with my python coding a little bit.

Having this code:

-----------------

import csv

import sys

import datetime

log_file = None

# Writes a complete line to the log file and moves to the next line of the log file

def log_write_line(*args):

    # Make the global log_file variable accessible from this function using the 'global' keyword

    global log_file

    # Convert the parameters into a list of parameters

    #args = ['my_block_nr', 'my_trial_nr',1]

    args = list(args)

    # Need to make sure that every single items in the 'args' list is of the variable type 'string'

    # In order for the generic 'join' method below to work. It accepts strings, not integers.

    # therefore 'list comprehensions' is necessary.

    # Read the line below as: 'args' becomes a list of every item 'a' converted to a string

    args = [str(a) for a in args]

    # Join those parameters together to a single comma-separated line.

    # At the end of these joined values, add a new line ("\n") character to move to the next line

    # in my log file.

    log_line = ','.join(args) + "\n"

    print 'log line:', log_line

    # Actually write the composed log line to the log file

    log_file.write(log_line)

    # Flush the data written to the file directly to the disk

    log_file.flush()

# Writes a single value to the log file, followed by a comma- choose sooner

def log_write_value(value):

    # Make the global log_file variable accessible from this function using the 'global' keyword

    global log_file

    print 'log write value:', value, type(value)

    log_file.write(str(value))

    log_file.write(',')

    log_file.flush()

# Moves the output of the log file to the next line

def log_write_newline():

    # Make the global log_file variable accessible from this function using the 'global' keyword

    global log_file

    log_file.write('\n')

    log_file.flush()

# Open new Data file

global log_file

filename = datetime.datetime.now().strftime("experiment-%y%m%d_%H%M%S.csv")

    

# Open Data file with thought probes

def open_data_thought_probes_plus_new_file():

    

    f = open('DATA_File.csv','rU')

    csv_f = csv.reader(f)

    

   

    for row in csv_f:

        if (row[4] == 'none'):

            # thought_probes relevant:

            print row[6], row[7], row[8], row[9], row[10], row[11], row[12], row[13]

            log_file = open (filename,"w")

            log_write_value(row[6])

            log_file.close()

    f.close()

def calculation_insertion ():

    open_data_thought_probes_plus_new_file()

calculation_insertion()

---------------------

I always receive the error:

NoneType' object has no attribute 'write'

What does that mean and how can I solve this?

Thanks a lot for answering!!

Best,

Marco

[Jeremy Gray]

If you look at the whole error message, it should also provide a line number and context about where this is happening. That info is *incredibly* useful. "NoneType' object has no attribute 'write'" is only a part of the error message, not the whole thing.

--Jeremy

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[m.t....@student.rug.nl]

Hi Jeremy,

It refers to line 46.

Thanks very much for helping me,

Marco

[m.t....@student.rug.nl]

PS: which is log_file.write(str(value))

[Jeremy Gray]

PS: which is log_file.write(str(value))

Cool. In general you can copy and paste the whole error, from Traceback... to the end. 

So the error means that the var log_file had the value None when you tried to call its .write() method. None does not have a .write() method. I don't see anywhere in the code that sets log_file to something that might have a method, something like:

log_file = open(filename, 'w+')  # open, + means for appending

I only see log_file = None, and a global log_file declaration (incidentally, a declaration as global is not needed at the module level, only needed within functions or methods if you are assigning to log_file).

--Jeremy

[m.t....@student.rug.nl]

Dear Jeremy,

Thanks so much for your help.

It helped a lot.

I wish you a great evening and all the best!

Marco

[Jeremy Gray]

Cool, good luck with your research.

--Jeremy

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[Egle, M.T.]

thank you!

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