Txt to CSV file, blank lines appear every other line

In use csv.writer When writing a file, I found an extra blank line in the middle .

The earliest way to open it is ‘w’, There will be extra blank lines , It is suggested to use binary form ‘wb’ Open to solve the problem ：python When writing files normally , The end of each line is added by default 'n’, namely 0x0D, and writerow The end of the command will add another 0x0D0A, So for windows system , It's just two lines , And use ’ b' Parameters , Write files in binary , By default, the system does not add 0x0D Of .

But only in python2 Run under ,python3 Report errors ：TypeError: a bytes-like object is required, not 'str'

The solution to this problem ： stay open() Add a parameter in newline='' that will do

with open('data/Gowalla_edges.csv', 'w',newline='') as csvfile:
    spamwriter = csv.writer(csvfile, dialect='excel')
    #  Read to convert txt file , Each line of the document is marked with @@@ Character separation 
    with open('data/Gowalla_edges.txt', 'r') as filein:
        for line in filein:
            print(line)
            line_list = line.strip('\n').split('\t')
            spamwriter.writerow(line_list)