count_spacer.py, syntax issue

[d3str4d0]

Hi,

I recently wanted to use your count_spacer.py script but ran into and issue:

File "count_spacers.py", line 36
dictionary = {rows[0]:0 for rows in reader}
^
SyntaxError: invalid syntax

The way I get it, the purpose if this piece of code is to read the input csv file containing the spacer sequences (single column .csv file w/o column name?) and then to initiate a dictionary by pasting the spacer sequences into 'dictionary'

when I run the following in the interpreter:

with open(input_file, mode='rU') as infile: #rU mode is necessary for excel!
reader = csv.reader(infile)
for rows in reader:
print(rows[0])

I can see that it picks up the spacer sequences as intended. By..

dictionary = {rows[0]:0 for rows in reader}

you pair every key entry from rows[0] with a value '0' , which in turn should be overwritten later on?
While the syntax looks valid to me, I possess only basic knowledge of python.
I use Python3.6. I wonder if I am missing anything here?

best,

EDIT:
a simple rewrite solves the issue.

for rows in reader:
dictionary={rows[0]:0}

I still don't get why your style did not work, suspect a Python version-specific issue, which has nothing to do with the script itself.