🌐 Mailman 3 November 2018 - Python-list - python.org

help me in a program in python to implement Railway Reservation System using file handling technique.
by jasminamrutia007＠gmail.com Nov. 25, 2018

Nov. 25, 2018

hello all, please hepl me in the above program. python to implement Railway Reservation System using file handling technique. System should perform below operations. a. Reserve a ticket for a passenger. b. List information all reservations done for today’s trains.

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Re: how to match list members in py3.x
by Muhammad Rizwan Nov. 25, 2018

Nov. 25, 2018

On Sunday, 25 November 2018 12:14:37 UTC-5, Joel Goldstick wrote: > On Sun, Nov 25, 2018 at 11:51 AM Muhammad Rizwan > <> wrote: > > > > On Sunday, 25 November 2018 11:41:56 UTC-5, Joel Goldstick wrote: > > > On Sun, Nov 25, 2018 at 11:36 AM Muhammad Rizwan > > > <> wrote: > > > > > > > > IF YOU CAN'T HELP BETTER IGNORE THE POST AND DON'T TRY TO BE A SMART ASS. > > > > > > > > > > > > -- > > > > https://mail.python.org/mailman/listinfo/python-list > > > > > > That isn't a productive way to get assistance. It is true that > > > people here are often very knowledgeable to help with python problems, > > > but as a rule, doing someone's homework isn't something people like > > > to do. > > > > > > On to your problem. You should understand lists and sets, and for > > > loops. Try some code and come back with what you have. Then you will > > > get help to go further > > > > > > -- > > > Joel Goldstick > > > http://joelgoldstick.com/blog > > > http://cc-baseballstats.info/stats/birthdays > > > > I have been trying since morning but it doesn't work. > > The way to use this mailing list is to explain your problem, which you > have done. Then, show the code you have written with the results it > produces. Its good to include the operating system you are using > (windows, linux, osx), and if your code produces a traceback, copy and > paste it here. > > Its common to be frustrated learning to write and writing code, but if > you want help you have to show something for others to help you with > > -- > > https://mail.python.org/mailman/listinfo/python-list > > > > -- > Joel Goldstick > http://joelgoldstick.com/blog > http://cc-baseballstats.info/stats/birthdays Below is my approach which I am sure is wrong somewhere and it doesn't work the way expected, the append doesn't do anything in my code nor does it returns any traceback all i see is a empty list printed at the end, I am using win10 x64 python 3.x atom-editor. Please take a look if you can tell me what am I doing wrong here. I want to check each list word by word if the word is not repeated in the same list it should be appended to a 'newlist'. Thanks in advance handle = open('file.txt') newlist = list() for line in handle: #line.rstrip() linewords = line.split() print(linewords) for word in linewords: newlist.append(word) if word not in linewords: continue print('new: ',newlist)

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Re: Issue in using "subprocess.Popen" for parsing the command output
by Wildman Nov. 25, 2018

Nov. 25, 2018

On Sun, 25 Nov 2018 22:43:10 +0530, srinivasan wrote: > Dear Python Experts Team, > > As am newbie still learning the python syntax from past 2 weeks, Excuse me, > If this might be silly question, As I am trying to execute shell command > (ie, nmcli) using "subprocess.Popen". > > * return proc.strip().decode("utf-8")* return proc.decode("utf-8").strip() -- <Wildman> GNU/Linux user #557453 The cow died so I don't need your bull!

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Re: how to match list members in py3.x
by Muhammad Rizwan Nov. 25, 2018

Nov. 25, 2018

On Sunday, 25 November 2018 11:41:56 UTC-5, Joel Goldstick wrote: > On Sun, Nov 25, 2018 at 11:36 AM Muhammad Rizwan > <> wrote: > > > > IF YOU CAN'T HELP BETTER IGNORE THE POST AND DON'T TRY TO BE A SMART ASS. > > > > > > -- > > https://mail.python.org/mailman/listinfo/python-list > > That isn't a productive way to get assistance. It is true that > people here are often very knowledgeable to help with python problems, > but as a rule, doing someone's homework isn't something people like > to do. > > On to your problem. You should understand lists and sets, and for > loops. Try some code and come back with what you have. Then you will > get help to go further > > -- > Joel Goldstick > http://joelgoldstick.com/blog > http://cc-baseballstats.info/stats/birthdays I have been trying since morning but it doesn't work.

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Re: how to match list members in py3.x
by Muhammad Rizwan Nov. 25, 2018

Nov. 25, 2018

Thank you

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Have I Been Banned?
by Wildman Nov. 24, 2018

Nov. 24, 2018

In the past I have participated in the group without any problems. I access the forum through the usenet mirror and I am still using the same newsreader and account. Recently I made some followup posts to the group and they never showed up. Have I been banned? If so, I would appreciate it to know why? Of course I am not sure if this post will make it to the server. -- <Wildman> GNU/Linux user #557453 Restricted area! Authorized trespassers only.

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Re: Improvement Request
by Alan Bawden Nov. 24, 2018

Nov. 24, 2018

Gilmeh Serda <gilmeh.serdah(a)nothing.here.invalid> writes: > On Fri, 23 Nov 2018 13:44:35 +0530, Sayan Kundu wrote: > > > *** Please make "Table of Contents" an independent scrolling panel* > > For a long documentation, users have to scroll up all the way to > > navigate a different sub-topic. > > And just what in the world are you talking about? And more to the point, > what does it have to do with the Python language? He/She is talking about the python documentation pages. See <https://docs.python.org/3.8/library/pickle.html> for example -- scroll down far enough and the table of contents disappears off the top. It's a reasonable request, but this probably isn't the most effective place to make it. -- Alan Bawden

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[ANN] Biovarase ver 2.8
by Beppe Nov. 24, 2018

Nov. 24, 2018

Biovarase has been updated to version 2.8 Biovarase is an application to manage clinical quality control data. The purpose of Quality Control Assurance in a clinical laboratory is to allow the control of the performances of an analytical procedure showing an alarm as soon as the trial doesn't result in the degree to respect the defined analytical rules. Biovarase furthermore calculates the classical statistical parameters for the quality control assurance ,e.g. sd, cv%, avg, and even the Imp(%), Bias(%) and TEa (total allowable error) using data retrived from: Current databases on biologic variation: pros, cons and progress Scand J Clin Lab Invest 1999;59:491-500. updated with the most recent specifications made available in 2014. It uses even the famous Westgard's rules to monitor results dataset. All the data are managed by SQLite database and matplotlib. Biovarase requires Python =>3.5 tkinter matplotlib xlwt last changelog 2018-11-24 Change the redrew mechanism, now Biovarase doesn't rebuild the graph from scratch when you select a batch, but update only the data. Add Quick Data Analysis function on the menu to analyze the last dataset for every test and relative bacth. Add histogram to plot frequency distribution of a dataset. Some minor refactoring on main.py code. We deserve an updating to version 2.8. ;) All source code on https://github.com/1966bc/Biovarase thank you for reading. regards beppe

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Odd truth result with in and ==
by Python Nov. 24, 2018

Nov. 24, 2018

$ python3 Python 3.5.2 (default, Nov 23 2017, 16:37:01) [GCC 5.4.0 20160609] on linux Type "help", "copyright", "credits" or "license" for more information. >>> 1 in [1,2,3] == True False >>> 1 in ([1,2,3] == True) Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: argument of type 'bool' is not iterable >>> (1 in [1,2,3]) == True True How is the first not equivalent to either one of the second or third? My expectation is it should produce the same result as the second. It *seems* like Python is ignoring the '1 in' part and just giving the result for '[1,2,3] == True'... Is this just a bug?

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subprocess.Popen(['/sbin/ldconfig', '-p'], stdin=PIPE) itself hangs/deadlocks (Linux)
by Henrik Bengtsson Nov. 24, 2018

Nov. 24, 2018

I ran into an interesting problem where calling `subprocess.Popen(['/sbin/ldconfig', '-p'], stdin=PIPE)` hangs and never returns. $ python Python 2.7.9 (default, Apr 23 2015, 22:07:47) [GCC 4.4.7 20120313 (Red Hat 4.4.7-11)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import subprocess >>> p = subprocess.Popen(['/sbin/ldconfig', '-p'], stdout=subprocess.PIPE) ^CTraceback (most recent call last): File "<stdin>", line 1, in <module> File "/opt/Python/Python-2.7.9/lib/python2.7/subprocess.py", line 710, in __init__ errread, errwrite) File "/opt/Python/Python-2.7.9/lib/python2.7/subprocess.py", line 1316, in _execute_child data = _eintr_retry_call(os.read, errpipe_read, 1048576) File "/opt/Python/Python-2.7.9/lib/python2.7/subprocess.py", line 476, in _eintr_retry_call return func(*args) KeyboardInterrupt >>> Note how I have to send a user interrupt to break out of `subprocess.Popen()`. TROUBLESHOOTING: First, it's interesting to note that the following works: >>> import subprocess >>> p = subprocess.Popen(['/sbin/ldconfig -p'], stdout=subprocess.PIPE, shell=True) >>> out,err = p.communicate() >>> len(out) 102460 >>> which I believe is the same as: >>> import subprocess >>> p = subprocess.Popen(['sh', '-c', '/sbin/ldconfig -p'], stdout=subprocess.PIPE) >>> out,err = p.communicate() >>> len(out) 102460 >>> which also works. Second, calling: >>> import subprocess >>> p = subprocess.Popen(['/sbin/ldconfig', '-p']) 1562 libs found in cache `/etc/ld.so.cache' libzmq.so.1 (libc6,x86-64) => /usr/lib64/libzmq.so.1 libz.so.1 (libc6,x86-64) => /lib64/libz.so.1 [ ... all 102,460 bytes of ldconfig -p output ...] ld-linux-x86-64.so.2 (libc6,x86-64) => /lib64/ld-linux-x86-64.so.2 >>> also works, so the PIPE is my main suspect. Finally, if I do: >>> import subprocess >>> p = subprocess.Popen(['/sbin/ldconfig', '-p'], stdout=subprocess.PIPE) [ manually pkill -INT ldconfig' ] >>> out,err = p.communicate() >>> len(out) 65536 >>> then I notice that it reads exactly 65,536=2^16 bytes (out of 102,460 bytes). I suspect this is related to the default buffer-size limit of pipes set by the Linux kernel. Using `strace` on the latter Python process, reveals: [...] open("/opt/Python/Python-2.7.9/lib/python2.7/lib-dynload/cStringIO.so", O_RDONLY) = 6 read(6, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0@\32\0\0\0\0\0\0"..., 832) = 832 fstat(6, {st_mode=S_IFREG|0755, st_size=49556, ...}) = 0 mmap(NULL, 2115000, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 6, 0) = 0x2ad3ca6e7000 mprotect(0x2ad3ca6eb000, 2093056, PROT_NONE) = 0 mmap(0x2ad3ca8ea000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 6, 0x3000) = 0x2ad3ca8ea000 close(6) = 0 close(5) = 0 close(4) = 0 getrlimit(RLIMIT_NOFILE, {rlim_cur=64*1024, rlim_max=64*1024}) = 0 close(3) = 0 fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2ad3ca8ec000 write(1, "1\n", 21 ) = 2 pipe([3, 4]) = 0 fcntl(3, F_GETFD) = 0 fcntl(3, F_SETFD, FD_CLOEXEC) = 0 fcntl(4, F_GETFD) = 0 fcntl(4, F_SETFD, FD_CLOEXEC) = 0 pipe([5, 6]) = 0 fcntl(5, F_GETFD) = 0 fcntl(5, F_SETFD, FD_CLOEXEC) = 0 fcntl(6, F_GETFD) = 0 fcntl(6, F_SETFD, FD_CLOEXEC) = 0 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x2ad3c972adf0) = 239074 close(6) = 0 mmap(NULL, 1052672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2ad3ca8ed000 read(5, and `strace` on the stalled `ldconfig` process reveals: $ strace -p $(pgrep ldconfig) Process 239074 attached - interrupt to quit write(1, "ibgconfmm-2.6.so.1 (libc6,x86-64"..., 4096 RH 6.6 0:- 1:-* 2:-- That latter `write()` contains the bytes after position 65,536, i.e. bytes 65,537 and beyond (not shown, but verified after careful inspection). MY CONCLUSION: To me, this looks like a deadlock in Popen() itself - is that correct? SESSION INFORMATION: All of the above is with Python 2.7.9 (installed from EPEL), but I can also reproduce it with Python 2.7.15 installed from source. What is also useful to know, is that I'm observing this on a legacy RHEL 6 system *with a customized kernel* part of the Scyld ClusterWare (https://www.penguincomputing.com/products/software/scyld-clusterware/) that *cannot* be updated: $ uname -a Linux n6 2.6.32-504.12.2.el6.664g0000.x86_64 #1 SMP Wed Mar 11 14:20:51 EDT 2015 x86_64 x86_64 x86_64 GNU/Linux I appreciate any suggestions to further troubleshoot this and ideally resolve it. The reason for this being an important issue is that `find_library()` of ctypes.util performs the above stalling `Popen(['/sbin/ldconfig', '-p'])` call that was introduced in Python (>= 2.7.13). This happens for instance whenever we try to create a new virtual environment using `virtualenv`. In other words, the solution is *not* really to change the code to use, say, the shell=True approach. Thanks, Henrik PS. This is my first post to this list - please let me know if I should send to another forum instead.

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