WIG to CSV (Try 2)

"""
Switch if/elif/else:This program will encode a wig file 'GSM730535_WT_NoPi_Nucleosome.wig' to a list with (position, data_value, chromosome number) as separate elements
Data from Zhou Xu, 2011 (https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSM730535)
"""
data=[]
update_line=["position", "data_value", "chromosome number"]
with open('GSM730535_WT_NoPi_Nucleosome.wig', 'r') as f: # Assign f as opening the wig file
    for line in f: 
        try:
            if int(line[0]) > -1:
            # for loop to split the position and data_value information from line
                position = ""
                m=[]
                for i in range(len(line)):
                    try: # get the position seperated
                        int(line[i])
                        position = position + line[i]
                    except ValueError: # run when hits the first space  
                        data_value = line[i+1:(-1)] # get the data_value
                        break
                update_line[0] = position
                update_line[1] = data_value
                m = update_line + m
                data.append(m) # add a line (position/data_value, chromosome number) to list "data"
        except ValueError:
            if "name" in line: 
                continue # remove the track line/definition line
            else:
            #if "chr1" in line or "chr2" in line or "chr3" in line or "chr4" in line or "chr5" in line or "chr6" in line or "chr7" in line or "chr8" in line or "chr9" in line or "chr10" in line or "chr11" in line or "chr12" in line or "chr13" in line or "chr14" in line or "chr15" in line or "chr16" in line: 
                num = line[19:24] # assign num as "chr# " or "chr##"
                update_line[2]= num # update the second element of the list "update_list" as the chromosome number
import csv
with open('practice.csv', 'w', newline = '') as h:
    writer = csv.writer(h)
    writer.writerows(data)