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for line in eingabedatei

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eingabedatei.next

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ausgabedatei = eingabedatei.Informationszeile A[1:3] + eingabedatei.Informationszeile C[2:3] + eingabedatei.Informationszeile B[4:7] + eingabedatei.Informationszeile A[4:5]

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#!/usr/bin/env python
# coding: utf-8
from itertools import chain, dropwhile, groupby, imap
from operator import itemgetter

A_LINE_PREFIX = '120 '
B_LINE_PREFIX = '500 '
C_LINE_PREFIX = '600 '


def is_block_start(line):
    """Checks if given `line` is the start of a new block."""
    return line.startswith(A_LINE_PREFIX)


def skip_prefix(lines):
    """Skip all lines until the first block starts."""
    return dropwhile(lambda s: not is_block_start(s), lines)


def iter_blocks(lines):
    """Iterates over the blocks.
    
    Returns iterators over the lines of each block.
    """
    def stamp(lines):
        i = -1
        for line in lines:
            if is_block_start(line):
                i += 1
            yield (i, line)
    return (
        imap(itemgetter(1), group)
        for i, group in groupby(stamp(lines), itemgetter(0))
    )


def process_block(lines):
    """Extracts the data from the lines of a block.
    
    Each block should start with an A line, followed by a B line, followed
    by one or more C lines.
    """
    lines = iter(lines)
    a_line = next(lines)
    assert is_block_start(a_line)
    b_line = next(lines)
    assert b_line.startswith(B_LINE_PREFIX)
    c_lines = list(lines)
    assert c_lines and all(s.startswith(C_LINE_PREFIX) for s in c_lines)
    
    return [
        a_line[1:3],
        '_'.join(s[2:3] for s in c_lines),
        b_line[4:7],
        a_line[4:5],
    ]


def main():
    with open('test.txt') as lines:
        with open('test2.txt', 'w') as out_file:
            out_file.writelines(
                '-'.join(xs) + '\n'
                for xs in imap(process_block, iter_blocks(skip_prefix(lines)))
            )


if __name__ == '__main__':
    main()

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TAGS = ('120 ','500 ','600 ')
def iter_blocks(lines):
    lines = iter(lines)
    line = next(lines)
    # Zeilen am Anfang ignorieren
    while line[:4]!=TAGS[0]:
        line = next(lines)
    # Bloecke lesen
    stop = False
    while not stop:
        result = []
        nxt = 0
        try:
            while line[:4]==TAGS[nxt]:
                result.append(line)
                line = next(lines)
                nxt = min(nxt+1,len(TAGS)-1)
        except StopIteration:
            stop = True
        if len(result)<len(TAGS):
            raise ValueError('%s erwartet!'%TAGS[len(result)])
        yield result

with open('test.txt') as lines:
    for bl in iter_blocks(lines):
        a_line = bl[0]
        b_line = bl[1]
        c_lines = bl[2:]
        ...

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lines = raw_input(u'Zeilenliste eingeben:').split(u',')

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text = raw_input(u'Zeilenliste eingeben:').replace(u',',u'\n')

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lines = []

i = 0
while True:
    i += 1
    line = raw_input(u'%3d. Zeile: '%i)
    if len(line)>0:
        lines.append(line)
    else:
        break

#ggf.
text = u'\n'.join(lines)

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    lines = list()
    i = 0
    while True:
        i += 1
        line = raw_input('{0:3d}. Zeile: '.format(i))
        if not line:
            break
        lines.append(line)

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    lines = list()
    for i in count(1):
        line = raw_input('{0:3d}. Zeile: '.format(i))
        if not line:
            break
        lines.append(line)

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    lines = list()
    for line in (raw_input('{0:3d}. Zeile: '.format(i)) for i in count(1)):
        if not line:
            break
        lines.append(line)

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    input_lines = (raw_input('{0:3d}. Zeile: '.format(i)) for i in count(1))
    lines = list(takewhile(bool, input_lines))