loial wrote:
> If I read a file using a for loop, as follows, is the file left open if I
> execute a break in the for loop?
>
>
> for line in open(myFile).readlines():
>
> if something:
> break
Whether the file is left open has nothing to do with how you leave the loop.
The way you wrote it (readlines() reads all lines into a list and there is
no reference to the file object left) CPython will close the file before you
enter the loop:
$ python
Python 2.7.6 (default, Mar 22 2014, 22:59:56)
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> for line in open("tmp.txt").readlines():
... raw_input("you are here")
... break
...
you are here
[1]+ Angehalten python
$ lsof *
Other implementations take a bit more time:
$ jython
"my" variable $jythonHome masks earlier declaration in same scope at
/usr/bin/jython line 15.
Jython 2.5.3 (, Nov 21 2013, 23:15:42)
[OpenJDK 64-Bit Server VM (Oracle Corporation)] on java1.7.0_65
Type "help", "copyright", "credits" or "license" for more information.
>>> for line in open("tmp.txt"): pass
...
>>>
[2]+ Angehalten jython
$ lsof *
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
java 9396 xxxxx 34r REG 8,23 17 5906455 tmp.txt
$
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