Read A File 8 Lines At A Time Python

Hello I am trying to read a file in Python 8 lines at a time and use the current 8 lines as str variables However I am unable to do this correctly and would appreciate any help wit

Solution 1:

Using the usual n things at a time pattern

from itertools import izip

with open("test.txt") as f:
    line_gen = izip(*[f]*8)
    for lines in line_gen:
        print lines
        firstname, lastname, email, fourth, fifth, sixth, seventh, eighth = lines
        ...

Solution 2:

A simple implementation using itertools.islice

from itertools import islice
with open("test.txt") as fin:
    try:
        while True:
            data =  islice(fin, 0, 8)

            firstname = next(data)
            lastname = next(data)
            email = next(data)
            #.....
    except StopIteration:
        pass

A better more pythonic implementation

>>> from collections import namedtuple
>>> from itertools import islice
>>> records = namedtuple('record',
                  ('firstname','lastname','email' #, .....
               ))
>>> with open("test.txt") as fin:
    try:
        while True:
            data =  islice(fin, 0, 3)

            data = record(*data)
            print data.firstname, data.lastname, data.email #.......
    except (StopIteration, TypeError):
        pass

Solution 3:

How about this :-

with open("test.txt", 'r') as infile:
    lines_gen = infile.readlines()
    for i in range(0, len(lines_gen), 8):
        (firstname, lastname, email, etc1, ..) = lines_gen[i:i+8]

untested

Solution 4:

Try this:

every_eight = []
lines = open('test.txt').readlines()
j = 0
for n in range(0, len(lines) +1, 8):
    every_eight.append(''.join([lines[l] for l in range(j, n)]))
    j = n

By the way, if you're trying to accept mass input for tons of people or something, you could try using dictionaires in a list like this:

info = []

every_eight = []
lines = open('test.txt').readlines()
j = 0
for n in range(0, len(lines) +1, 8):
    every_eight.append([lines[l] for l in range(j, n)])
    j = n

for setinf in every_eight:
    if len(setinf) == 8:
        info.append({
                'firstname': setinf[0],
                'lastname' : setinf[1],
                'email'    : setinf[2],
            })

for inf in info:
    print inf

Solution 5:

with open("test.txt", 'r') as infile:
    it = iter(infile)
    while True:
        lines_list = []
        try:
            for i in range(8):
                lines_list.append(next(it))
        except StopIteration:
            if len(lines_list) == 0:
                break
        for eight_lines in lines_list:
            # Do something with eight_lines[0:8]