Is there a way to read a .txt file and store each line to memory?

Question

I am making a little program that will read and display text from a document. I have got a test file which looks like this:

12,12,12
12,31,12
1,5,3
...


        

Answer 1

Thanks for @PePr excellent solution. In addition, you can try to print the .txt file with the built-in method String.join(data). For example:

with open(filename) as f:
    data = f.readlines()
print(''.join(data))

Answer 2

Try storing it in an array

f = open( "file.txt", "r" )
a = []
for line in f:
    a.append(line)

Answer 3

#!/usr/local/bin/python

t=1

with open('sample.txt') as inf:
    for line in inf:
        num = line.strip() # contains current line
        if num:
            fn = '%d.txt' %t # gives the name to files t= 1.txt,2.txt,3.txt .....
            print('%d.txt Files splitted' %t)
            #fn = '%s.txt' %num
            with open(fn, 'w') as outf:
                outf.write('%s\n' %num) # writes current line in opened fn file
                t=t+1

Answer 4

You may also be interested in the csv module. It lets you parse, read and write to files in the comma-separated values( csv) format...which your example appears to be in.

Example:

import csv
reader = csv.reader( open( 'file.txt', 'rb'), delimiter=',' )
#Iterate over each row
for idx,row in enumerate(reader):
    print "%s: %s"%(idx+1,row)

Answer 5

with open('test.txt') as o:
    for i,t in enumerate(o.readlines(), 1):
        print ("%s. %s"% (i, t))

Answer 6

I know it is already answered :) To summarize the above:

# It is a good idea to store the filename into a variable.
# The variable can later become a function argument when the
# code is converted to a function body.
filename = 'data.txt'

# Using the newer with construct to close the file automatically.
with open(filename) as f:
    data = f.readlines()

# Or using the older approach and closing the filea explicitly.
# Here the data is re-read again, do not use both ;)
f = open(filename)
data = f.readlines()
f.close()


# The data is of the list type.  The Python list type is actually
# a dynamic array. The lines contain also the \n; hence the .rstrip()
for n, line in enumerate(data, 1):
    print '{:2}.'.format(n), line.rstrip()

print '-----------------'

# You can later iterate through the list for other purpose, for
# example to read them via the csv.reader.
import csv

reader = csv.reader(data)
for row in reader:
    print row

It prints on my console:

 1. 12,12,12
 2. 12,31,12
 3. 1,5,3
-----------------
['12', '12', '12']
['12', '31', '12']
['1', '5', '3']