start reading from certain line

[antar2]

I am a starter in python and would like to write a program that reads
lines starting with a line that contains a certain word.
For example the program starts reading the program when a line is
encountered that contains 'item 1'


The weather is nice
Item 1
We will go to the seaside
....

Only the lines coming after Item 1 should be read

Thanks!

 

[Tim Cook]

I am a starter in python and would like to write a program that reads
lines starting with a line that contains a certain word.
For example the program starts reading the program when a line is
encountered that contains 'item 1'


The weather is nice
Item 1
We will go to the seaside
...

Only the lines coming after Item 1 should be read

file=open(filename)
while True:
line=file.readline()
if not line:
break

if 'Item 1' in line:
print line


HTH,
Tim


--
**************************************************************************
Join the OSHIP project. It is the standards based, open source
healthcare application platform in Python.
http://www.openehr.org/wiki/display/dev/Python+developer's+page
**************************************************************************

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.7 (GNU/Linux)

iD8DBQBIdJgQ2TFRV0OoZwMRAoVLAJ9GCFJDFj5oC2dnpRyscAXYo5/adACfW9Zs
Nv1UyhWGN5c3sEptr34bDw8=
=IUgo
-----END PGP SIGNATURE-----

 

[Diez B. Roggisch]

I am a starter in python and would like to write a program that reads
lines starting with a line that contains a certain word.
For example the program starts reading the program when a line is
encountered that contains 'item 1'


The weather is nice
Item 1
We will go to the seaside
...

Only the lines coming after Item 1 should be read

Start reading each line, and skip them until your criterion matches. Like
this:

def line_skipper(predicate, line_iterable):
for line in line_iterable:
if predicate(line):
break
for line in line_iterable:
yield line

Diez

 

[Tim Cook]

I am a starter in python and would like to write a program that reads
lines starting with a line that contains a certain word.
For example the program starts reading the program when a line is
encountered that contains 'item 1'


The weather is nice
Item 1
We will go to the seaside
...

Only the lines coming after Item 1 should be read

file=open(filename)
while True:
line=file.readline()
if not line:
break

if 'Item 1' in line:
print line


HTH,
Tim


--
**************************************************************************
Join the OSHIP project. It is the standards based, open source
healthcare application platform in Python.
Home page: https://launchpad.net/oship/
Wiki: http://www.openehr.org/wiki/display/dev/Python+developer's+page
**************************************************************************

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.7 (GNU/Linux)

iD8DBQBIdJmO2TFRV0OoZwMRAuwcAJ9cTcQdyiBMxr6ictzePenLqHYd3ACgttA4
+s098hCCPN8N+WoGOzNmnfs=
=kKwH
-----END PGP SIGNATURE-----

 

[norseman]

file=open(filename)
while True:
line=file.readline()
if not line:
break

if 'Item 1' in line:
print line


HTH,
Tim

=======================================================

I would use:

readthem= 0
file=open(filename,'r')
while readthem == 0:
line=file.readline()
if not line:
break
if 'Item 1' in line:
readthem= 1
# print line # uncomment if 'Item 1' is to be printed
while line:
line= file.readline()
print line # see note-1 below
# end of segment

The first while has lots of needed tests causing lots of bouncing about.
May even need more tests to make sure it is right tag point. As in if
'Item 1' accidentally occurred in a line previous to intended one.
The second while just buzzes on through.
If the objective is to process from tag point on then processing code
will be cleaner, easier to read in second while.

note-1:
in this form the line terminators in the file are also printed and then
print attaches it's own EOL (newline). This gives a line double spacing
effect, at least in Unix. Putting the comma at the end (print line,)
will stop that. You will need to modify two lines if used. Which to use
depends on you.


Steve
(e-mail address removed)

 

[jstrick]

Here's a simple way to do it with a minimum amount of loopiness (don't
forget to use 'try-except' or 'with' in real life):

f = open("item1.txt")

for preline in f:
if "Item 1" in preline:
print preline,
for goodline in f:
# could put an end condition with a 'break' here
print goodline,

f.close()

 

[Iain King]

Here's a simple way to do it with a minimum amount of loopiness (don't
forget to use 'try-except' or 'with' in real life):

f = open("item1.txt")

for preline in f:
    if "Item 1" in preline:
        print preline,
        for goodline in f:
            # could put an end condition with a 'break' here
            print goodline,

f.close()

No

 

[Iain King]

No

Ignore that