import os
import urllib.request
import cdflib


def test_read():
    fname = 'helios.cdf'
    url = '''http://helios-data.ssl.berkeley.edu/data/
             E1_experiment/New_proton_corefit_data_2017/
             cdf/helios1/1974/h1_1974_346_corefit.cdf'''
    if not os.path.exists(fname):
        urllib.request.urlretrieve(url, fname)
    cdflib.CDF(fname)

@@ -93,18 +93,16 @@
   url = 
-''
 'http://
@@ -135,19 +135,18 @@
 du/data/
+%5C
 %0A
-  
         
@@ -191,19 +191,18 @@
 ta_2017/
+%5C
 %0A
-  
         
@@ -245,18 +245,16 @@
 fit.cdf'
-''
 %0A    if 

Update test_cdfread.py url syntax