Programming Forums > Script Programming > Python

Dietrich · Oct 1st, 2006, 2:10 PM

SqLite sounds interesting, how do I get started using it?
Particularly the use as a data store.

titaniumdecoy · Oct 1st, 2006, 3:12 PM

Could someone give me an example of how to use the "with" statement?

Arevos · Oct 1st, 2006, 3:40 PM

 python Syntax (Toggle Plain Text) 
# Old way
file = open("somefile")
try:
    print file.readline(),
finally:
    file.close()
 
# New way
with open("somefile") as file:
    print file.readline(),
# Old way
file = open("somefile")
try:
    print file.readline(),
finally:
    file.close()

# New way
with open("somefile") as file:
    print file.readline(),

Essentially, the "with" block enables you to add an enter and exit clause to an object. In the case of the file object, the exit clause closes the file.

This has a number of advantages. Opening files is the obvious one, but any other type of IO operation also benefits. For instance, one could put a database cursor in a "with" block, and automatically have it rollback any operations if an exception occurs. Also, OpenGL has a lot of "StartSomething()" and "EndSomething()" functions that could be wrapped up in a with block.

So it's pretty neat. It makes your code easier to read, and ensures you never forget to properly close/rollback/stop an operation.

gnuvince · Oct 1st, 2006, 4:42 PM

One nice thing in 2.5 is the nice speed improvements. A lot of my scripts execute more than twice as fast!

Game_Ender · Oct 10th, 2006, 9:36 PM

Quote:

Originally Posted by Jessehk

I'm wating for the .deb . I did download the source and make'ed it so I could test the new features, but I never make install'ed.

I was even prepared to make my own package, but I was quickly overhwhelmed.

Just use your good friend checkinstall, run "sudo checkinstall" instead of "sudo make install" and you should have package reading to install (and remove) at your leisure.

Oct 1st, 2006, 2:10 PM	#11
Dietrich Professional Programmer Join Date: Feb 2005 Posts: 434 Rep Power: 4	SqLite sounds interesting, how do I get started using it? Particularly the use as a data store. __________________ I looked it up on the Intergnats!

Oct 1st, 2006, 3:40 PM	#13
Arevos Programming Guru Join Date: Aug 2005 Location: England Posts: 1,499 Rep Power: 4	python Syntax (Toggle Plain Text) # Old way file = open("somefile") try: print file.readline(), finally: file.close() # New way with open("somefile") as file: print file.readline(), # Old way file = open("somefile") try: print file.readline(), finally: file.close() # New way with open("somefile") as file: print file.readline(), Essentially, the "with" block enables you to add an enter and exit clause to an object. In the case of the file object, the exit clause closes the file. This has a number of advantages. Opening files is the obvious one, but any other type of IO operation also benefits. For instance, one could put a database cursor in a "with" block, and automatically have it rollback any operations if an exception occurs. Also, OpenGL has a lot of "StartSomething()" and "EndSomething()" functions that could be wrapped up in a with block. So it's pretty neat. It makes your code easier to read, and ensures you never forget to properly close/rollback/stop an operation.

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Oct 1st, 2006, 3:12 PM	#12
titaniumdecoy Expert Programmer Join Date: Nov 2005 Posts: 836 Rep Power: 3	Could someone give me an example of how to use the "with" statement?

Oct 1st, 2006, 4:42 PM	#14
gnuvince Newbie Join Date: Oct 2006 Posts: 1 Rep Power: 0	One nice thing in 2.5 is the nice speed improvements. A lot of my scripts execute more than twice as fast!

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Programming Forums > Script Programming > Python

Python 2.5