Question

I writing a script in python in which I am extracting some information from some files and passing it into another file.

I have 2 dictionaries that contains lists of elements of a class, and I want to write each element of the list into a .csv file.

When I try to write the data to the file it appears in a weird way. I want the data to appear in this way:

Sample_3 45526536 7010285 31195850 7320401 45500691 7186449 31021951 7292291  
Sample_1 48885783 7715654 33474067 7696062 48857972 7907873 33282945 7667154

but instead I have this result:

 Sample_3 ['45526536'] ['7010285'] ['31195850'] ['7320401'] ['45500691'] ['7186449'] ['31021951'] ['7292291']
 Sample_1 ['48885783'] ['7715654'] ['33474067'] ['7696062'] ['48857972'] ['7907873'] ['33282945']['7667154']

Does anyone know why is adding [´´] to the numbers? I try to make an really simple method to eliminate the [‘ ‘] but then I won’t print anything in the file.

def correct_str(value):  
    new= str(value).strip("['")
    final= str(new).strip("']")
    return final

Here is the code here I am adding elements to the dictionary, the dictionary is a global variable called stat_dict_l_u, and the name is the key to the dictionary, in this case Sample_1 and Sample_2, and list values is a list that contains the numbers I got from a file. I believe that maybe my problem comes from the way I am adding the values to the dictionary.

def processNumbersLeft(name,list_values):

    list_reads=[]


    for value in list_values:
        print value.total_reads
        list_reads.append(value.total_reads)



    list_aligned_once=[]
    for value in list_values:

        n=re.split(" ",value.aligned_once)
                 list_aligned_once.append(n[0])


    list_failed=[]
    for value in list_values:

        n=re.split(" ",value.failed)
        list_failed.append(n[0])

    list_aligned_several=[]
    for value in list_values:

        n=re.split(" ",value.aligned_several)

        list_aligned_several.append(n[0])



    stat_elem=Statistics(list_reads,list_aligned_once,list_failed,list_aligned_several)

    stat_dict_l_u[name]=stat_elem

Thank you!

Answer 1

Try to use this case:

def to_file(d):
    return '\n'.join("%s %s" % (key, ' '.join(map(str, values))) for key, values in d.items())

Using:

>>> print to_file({'Sample_1': [1,2,3], 'Sample_2': [4,5,6]})
Sample_1 1 2 3
Sample_2 4 5 6

Note, if you need to a lot of work with csv-file, use helpful module csv. Example of using:

import csv
with open('eggs.csv', 'wb') as csvfile:
    spamwriter = csv.writer(csvfile, delimiter=' ', quoting=csv.QUOTE_MINIMAL)
    for key, values in d.items():
        spamwriter.writerow([key] + values)

This example does exactly what you need. For more information read documentation.