Re: Location of IBM python SDK language and standard library documentation?
Rockets Python could do I/O to MVS data sets. Rocket also ported the Python CFFI package which would make writing a library in pure Python a snip. I wonder if IBM has ported CFFI? I would open an RFE. IBM have created MVS file I/O packages for golang and Node.js. On 31/07/2022 7:02 am, Farley, Peter x23353 wrote: I have been looking around on various IBM websites trying to find the IBM versions of the normal python language and python standard library documentation to answer a few z/OS-specific python questions. 1. Does the z/OS implementation of the python language standard function "open()" accept z/OS Unix System Services file name format for MVS flat and PDS(E) datasets (e.g., "//'MVS.FLAT.FILE'" and "//'MVS.PDS(PDSMEM)'")? (I.E., under the covers does it use the "open()" or "fopen()" C library function?) 2. Is the "zos_util" library package available in all versions of the z/OS python SDK? TIA for any RTFM or url's you can point me to. PDF's of the documentation for offline reading would be welcome if they are available. Peter -- This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Location of IBM python SDK language and standard library documentation?
Hi,
What about:
https://docs.python.org/3/library/io.html
A quick idea:
https://www.w3schools.com/python/python_file_open.asp
Or this.
https://www.geeksforgeeks.org/read-a-file-line-by-line-in-python/
Best
Peter Sylvester
On 31/07/2022 20:29, Farley, Peter x23353 wrote:
Thanks Colin, I did already find that manual, but the only two useful things in there for
ordinary programmers is the zos_util documentation and the table of "tagging"
behavior.
There are also the zoautil command line utilities and python API, but the file "read()" and "write()" functions there
assume you can read/write the entire file into/from memory. No "readline()" ow "writeline()" functions are provided as
far as I can see. And the "read()" and "write()" functions are quite slow (6 to 9 seconds to read a 300-record
LRECL=80 PDS member for instance).
I was hoping for better integration and performance than what I have seen so far, as well
as better z/OS-specific documentation. A "Programmers Guide" kind of book.
Peter
-Original Message-
From: IBM Mainframe Discussion List On Behalf Of
Colin Paice
Sent: Sunday, July 31, 2022 3:36 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Location of IBM python SDK language and standard library
documentation?
The manual SC28-3143-02 I*BM Open Enterprise SDK for Python 3.10* may be what
you want
import zos_util
f = open("//'USER.Z24C.PROCLIB(PYT)'","r")
read_data = f.read()
print(read_data)
gives
Traceback (most recent call last):
File "/u/tmp/zos/z.py", line 1, in
f = open("//'USER.Z24C.PROCLIB(PYT)'","r")
FileNotFoundError: [Errno 129] EDC5129I No such file or directory.:
"//'USER.Z24C.PROCLIB(PYT)'"
I've blogged on several Python topics on z/OS ... see here
<https://urldefense.com/v3/__https://colinpaice.blog/category/python/__;!!Ebr-cpPeAnfNniQ8HSAI-g_K5b7VKg!N01KSqYEyXJOjU0ho5xjSSa-mOam2p_MmXx6GvuEKYJZN4Jw3NCavz64oy3NIhoCUpc9mWbZjmzLZNuTOtarBwZY9w$
>.
I'm currently looking at writing an extension to use fopen etc. and read
datasets, so please contact me offline if you would like more info
Colin
On Sun, 31 Jul 2022 at 00:03, Farley, Peter x23353 <
031df298a9da-dmarc-requ...@listserv.ua.edu> wrote:
I have been looking around on various IBM websites trying to find the
IBM versions of the normal python language and python standard library
documentation to answer a few z/OS-specific python questions.
1. Does the z/OS implementation of the python language standard
function "open()" accept z/OS Unix System Services file name format
for MVS flat and PDS(E) datasets (e.g., "//'MVS.FLAT.FILE'" and
"//'MVS.PDS(PDSMEM)'")? (I.E., under the covers does it use the "open()"
or "fopen()" C library function?)
2. Is the "zos_util" library package available in all versions of the
z/OS python SDK?
TIA for any RTFM or url's you can point me to. PDF's of the
documentation for offline reading would be welcome if they are available.
Peter
--
This message and any attachments are intended only for the use of the addressee
and may contain information that is privileged and confidential. If the reader
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the intended recipient, you are hereby notified that any dissemination of this
communication is strictly prohibited. If you have received this communication
in error, please notify us immediately by e-mail and delete the message and any
attachments from your system.
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--
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Re: Location of IBM python SDK language and standard library documentation?
Thanks Colin, I did already find that manual, but the only two useful things in
there for ordinary programmers is the zos_util documentation and the table of
"tagging" behavior.
There are also the zoautil command line utilities and python API, but the file
"read()" and "write()" functions there assume you can read/write the entire
file into/from memory. No "readline()" ow "writeline()" functions are provided
as far as I can see. And the "read()" and "write()" functions are quite slow
(6 to 9 seconds to read a 300-record LRECL=80 PDS member for instance).
I was hoping for better integration and performance than what I have seen so
far, as well as better z/OS-specific documentation. A "Programmers Guide" kind
of book.
Peter
-Original Message-
From: IBM Mainframe Discussion List On Behalf Of
Colin Paice
Sent: Sunday, July 31, 2022 3:36 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Location of IBM python SDK language and standard library
documentation?
The manual SC28-3143-02 I*BM Open Enterprise SDK for Python 3.10* may be what
you want
import zos_util
f = open("//'USER.Z24C.PROCLIB(PYT)'","r")
read_data = f.read()
print(read_data)
gives
Traceback (most recent call last):
File "/u/tmp/zos/z.py", line 1, in
f = open("//'USER.Z24C.PROCLIB(PYT)'","r")
FileNotFoundError: [Errno 129] EDC5129I No such file or directory.:
"//'USER.Z24C.PROCLIB(PYT)'"
I've blogged on several Python topics on z/OS ... see here
<https://urldefense.com/v3/__https://colinpaice.blog/category/python/__;!!Ebr-cpPeAnfNniQ8HSAI-g_K5b7VKg!N01KSqYEyXJOjU0ho5xjSSa-mOam2p_MmXx6GvuEKYJZN4Jw3NCavz64oy3NIhoCUpc9mWbZjmzLZNuTOtarBwZY9w$
>.
I'm currently looking at writing an extension to use fopen etc. and read
datasets, so please contact me offline if you would like more info
Colin
On Sun, 31 Jul 2022 at 00:03, Farley, Peter x23353 <
031df298a9da-dmarc-requ...@listserv.ua.edu> wrote:
> I have been looking around on various IBM websites trying to find the
> IBM versions of the normal python language and python standard library
> documentation to answer a few z/OS-specific python questions.
>
> 1. Does the z/OS implementation of the python language standard
> function "open()" accept z/OS Unix System Services file name format
> for MVS flat and PDS(E) datasets (e.g., "//'MVS.FLAT.FILE'" and
> "//'MVS.PDS(PDSMEM)'")? (I.E., under the covers does it use the "open()"
> or "fopen()" C library function?)
> 2. Is the "zos_util" library package available in all versions of the
> z/OS python SDK?
>
> TIA for any RTFM or url's you can point me to. PDF's of the
> documentation for offline reading would be welcome if they are available.
>
> Peter
--
This message and any attachments are intended only for the use of the addressee
and may contain information that is privileged and confidential. If the reader
of the message is not the intended recipient or an authorized representative of
the intended recipient, you are hereby notified that any dissemination of this
communication is strictly prohibited. If you have received this communication
in error, please notify us immediately by e-mail and delete the message and any
attachments from your system.
--
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Location of IBM python SDK language and standard library documentation?
The manual SC28-3143-02 I*BM Open Enterprise SDK for Python 3.10* may be
what you want
import zos_util
f = open("//'USER.Z24C.PROCLIB(PYT)'","r")
read_data = f.read()
print(read_data)
gives
Traceback (most recent call last):
File "/u/tmp/zos/z.py", line 1, in
f = open("//'USER.Z24C.PROCLIB(PYT)'","r")
FileNotFoundError: [Errno 129] EDC5129I No such file or directory.:
"//'USER.Z24C.PROCLIB(PYT)'"
I've blogged on several Python topics on z/OS ... see here
Location of IBM python SDK language and standard library documentation?
I have been looking around on various IBM websites trying to find the IBM versions of the normal python language and python standard library documentation to answer a few z/OS-specific python questions. 1. Does the z/OS implementation of the python language standard function "open()" accept z/OS Unix System Services file name format for MVS flat and PDS(E) datasets (e.g., "//'MVS.FLAT.FILE'" and "//'MVS.PDS(PDSMEM)'")? (I.E., under the covers does it use the "open()" or "fopen()" C library function?) 2. Is the "zos_util" library package available in all versions of the z/OS python SDK? TIA for any RTFM or url's you can point me to. PDF's of the documentation for offline reading would be welcome if they are available. Peter -- This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
