float default formatting

[Bernard Delmée]

Is there a simple way to modify the default sprintf mask
used for floats ? (eg something like sys.float_mask = '%.2f')
I've tried assigning to float.__dict__[ '__str__' ], but
that's apparently not allowed.

[Tim Roberts]

Bernard Delmée <bd*****@advalv as.REMOVEME.be> wrote:

Is there a simple way to modify the default sprintf mask
used for floats ? (eg something like sys.float_mask = '%.2f')
I've tried assigning to float.__dict__[ '__str__' ], but
that's apparently not allowed.

No. The mask string is passed relatively directly to sprintf, with no
hidden charges or destination fees. %f gets you the whatever your C
library does by default.

This is one way, but there are more efficient methods:

FLT = "%.2f"
print ("abc="+FLT+ " def="+FLT) % (3.0,4.5)

Are you trying to do currency? There are better ways, using the locale
methods.
--
- Tim Roberts, ti**@probo.com
Providenza & Boekelheide, Inc.

[Bernard Delmée]

> Are you trying to do currency? There are better ways, using the locale

methods.

No, just dumping some data structures and I'd rather not
check every item's type and format floats explicitly.
I was hoping the sprintf mask float's __str__ probably
uses was somehow exposed and could be altered.