Blank lines when printing a .csv file in python

Question

I'm using a basic block to sort and print a .csv file. It is sorted and printed correctly apart from several blank lines being printed but they don't exist within the actual csv file.

file = open("class1.csv", "r")
sort = sorted(file,key=operator.itemgetter(0))
for eachline in sort:
    print (eachline)

Answer 1

The problem is that iterating over a file leaves the newline characters on the end:

>>> for i in open("a.py"):
...     print(repr(i))
... 
'import math\n'
'\n'
'\n'
<snipped>

Therefore, when you print the lines, the print function adds another "\n" to the end, and you get something similar to:

>>> print("import math\n")
import math

>>>

The easiest way to remedy this (I am assuming you are using Python 3, judging by the brackets with the print) is to use the end option for print:

for eachline in sort:
    print(eachline, end="")

This will stop print from adding an extra "\n" (it adds "" instead, which does nothing), and so there are no extra newlines:

>>> print("import math\n", end="")
import math
>>>

If you are on python 2 or don't want to modify the print, you can strip the "\n" using str.replace:

for eachline in sort:
    print(eachline.replace("\n", ""))