On 2/28/2019 11:09 AM, ast wrote:
Hello
I just uploaded a package on pypi, whose name is "arith_lib"
The strange thing is that on pypi the package is renamed "arith-lib"
The underscore is substitued with a dash
If we search for this package:
pip search arith
arith-lib (2.0.0) - A set of functions for miscellaneous arithmetic
(so a dash)
For installation both:
pip install -U arith_lib
pip install -U arith-lib
are working well
and in both case I got a directory with an underscore
C:\Program Files\Python36-32\Lib\site-packages
28/02/2019 16:57 <REP> arith_lib
28/02/2019 16:57 <REP> arith_lib-2.0.0.dist-info
What happens ?
To expand on Paul's answer.
English uses '-' both as a connector for compound names and as a
subtraction operator. Context usually makes the choice obvious. But
context-free parsers must choose just one, and for computation,
subtraction wins. 'arith-lib' is parsed as (arith) - (lib). Many
algorithm languages use '_' instead of '-' as the compounder for
identifiers (object names).
In addition, Python uses filenames -(minus) '.py' as identifiers for
imported modules. So if the repository allows '-' in package names,
installers must convert '-' to '_'. But if the repository allows
'arith_lib' and 'arith-lib' to be distinct names for different packages,
both would be installed with the same file name. So the repository
standardizes on one form, and it went with English instead of Pythonese.
--
Terry Jan Reedy
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