I am looking to create a file then read the values I just put into it and put those values into a list. I use readlines to do so, however I get the "list assignment index out of range" error which tells me that its not reading the file.
here is my code:
import os
class open_saved_file():
def __init__(self):
self.path = os.getcwd()
self.path_extension = "/Saved_Paths"
self.file_extension = "/Paths.txt"
self.paths = []
def test_path(self):
test_bool = os.path.exists(self.path+self.path_extension)
#1) path does not exist
if not test_bool:
print "The start folder does not exist, let's create it"
os.makedirs(self.path+self.path_extension)
print "just made file, now make Paths.txt"
of = open(self.path+self.path_extension+self.file_extension, 'w+')
print "Lets add 4 dummy lines of code"
i = 0
while i < 4:
of.write("dummy\n")
i = i+1
print "just added four lines of dummy"
of.close()
print "lets test"
self.read_lines_into_list()
return self.paths
#2) path and file exist
else:
print "The start folder did exist, yay!"
print "lets open it and put its value into paths list"
self.read_lines_into_list()
return self.paths
def read_lines_into_list(self):
of = open(self.path+self.path_extension+self.file_extension)
lines = of.readlines()
self.paths[0] = lines[0][:-1]
self.paths[1] = lines[1][:-1]
self.paths[2] = lines[2][:-1]
self.paths[3] = lines[3][:-1]
print "lets test if all the values went in"
j = 0
while j < 4:
print self.paths[j]
i = i+1
The error occurs not because lines is empty, but because self.paths is. Instead of:
self.paths[0] = lines[0][:-1]
Use append():
self.paths.append(lines[0][:-1])
You're also going to get an error in your while loop because you're doing a i = i+1 when your loop variable is j. You can simply replace i with j, or even better, use a for loop:
for path in self.paths:
print path