[Tutor] Error Handling in python
Hi All My shell script is not throwing any error when I am having some error in Python code. test.py ~~ def main(): print Test #some case error need to be thrown raise Exception(Here is error) if __name__ == __main__ main() ~~ second.py ~~ def main(): print Second function is called if __name__ == __main__ main() ~~ ~ shellTest.sh ~~~ python test.py python second.py ~~~ In this case, I dont want to run my second.py Even I am throwing error from my test.py, but still second.py is getting executed, which i dont want, Thanks Regards Jitendra ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Error Handling in python
On Thu, Jul 24, 2014 at 1:35 PM, jitendra gupta jitu.ic...@gmail.com wrote: Hi All My shell script is not throwing any error when I am having some error in Python code. In this case, I dont want to run my second.py Even I am throwing error from my test.py, but still second.py is getting executed, which i dont want, You must expilicitly ask your shell to do exit if something fails. Like this: ~ shellTest.sh ~~~ #!/bin/bash set -e python test.py python second.py ~~~ I explicitly set the shell to /bin/bash on the shebang line, and then set the -e option to fail when a command exits with a non-zero status. You should always have a shebang line in your shell files, and execute them as ./shellTest.sh (after chmod +x shellTest.sh); moreover, one for Python files is recommended, like this: #!/usr/bin/env python -- Chris “Kwpolska” Warrick http://chriswarrick.com/ PGP: 5EAAEA16 stop html mail | always bottom-post | only UTF-8 makes sense ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Error Handling in python
On 24.07.2014 13:35, jitendra gupta wrote: Hi All My shell script is not throwing any error when I am having some error in Python code. test.py ~~ def main(): print Test #some case error need to be thrown raise Exception(Here is error) if __name__ == __main__ main() ~~ second.py ~~ def main(): print Second function is called if __name__ == __main__ main() ~~ ~ shellTest.sh ~~~ python test.py python second.py ~~~ In this case, I dont want to run my second.py Even I am throwing error from my test.py, but still second.py is getting executed, which i dont want, Your shell script calls runs the two Python scripts separately, that is, it first starts a Python interpreter telling it to run test.py . When that is done (with whatever outcome !), it starts the interpreter a second time telling it to run second.py now. The exception stops the execution of test.py, of course, and causes the interpreter to return, but your shell script is responsible for checking the exit status of the first script if it wants to run the second call only conditionally. Try something like this (assuming bash): python test.py if [ $? = 0 ]; then python second.py fi as your shell script. By the way, both Python scripts you posted contain a syntax error, but I leave spotting it up to you. Best, Wolfgang ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Error Handling in python
On Thu, Jul 24, 2014 at 05:05:24PM +0530, jitendra gupta wrote: Hi All My shell script is not throwing any error when I am having some error in Python code. This is a question about the shell, not about Python. I'm not an expert on shell scripting, but I'll try to give an answer. ~ shellTest.sh ~~~ python test.py python second.py One fix is to check the return code of the first python process: [steve@ando ~]$ python -c pass [steve@ando ~]$ echo $? 0 [steve@ando ~]$ python -c raise Exception Traceback (most recent call last): File string, line 1, in module Exception [steve@ando ~]$ echo $? 1 Remember that to the shell, 0 means no error and anything else is an error. So your shell script could look like this: python test.py if [ $? -eq 0 ] then python second.py fi Another way (probably better) is to tell the shell to automatically exit if any command fails: set -e python test.py python second.py Hope this helps, -- Steven ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Error Handling in python
On Thu, Jul 24, 2014 at 2:01 PM, Wolfgang Maier wolfgang.ma...@biologie.uni-freiburg.de wrote: Try something like this (assuming bash): python test.py if [ $? = 0 ]; then python second.py fi as your shell script. The [ ] and = should be doubled. But all this is not needed, all you need is: python test.py python second.py However, you need to explicitly stack all the commands you want to execute this way — so, if there are more things, `set -e` might also be of use. (you would need an even uglier tree for `if`s.) -- Chris “Kwpolska” Warrick http://chriswarrick.com/ PGP: 5EAAEA16 stop html mail | always bottom-post | only UTF-8 makes sense ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Error Handling in python
On 24.07.2014 14:09, Chris “Kwpolska” Warrick wrote: On Thu, Jul 24, 2014 at 2:01 PM, Wolfgang Maier wolfgang.ma...@biologie.uni-freiburg.de wrote: Try something like this (assuming bash): python test.py if [ $? = 0 ]; then python second.py fi as your shell script. The [ ] and = should be doubled. ?? why that ? But all this is not needed, all you need is: python test.py python second.py I agree, that's far more elegant in this case. However, you need to explicitly stack all the commands you want to execute this way — so, if there are more things, `set -e` might also be of use. (you would need an even uglier tree for `if`s.) ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Error Handling in python
On Thu, Jul 24, 2014 at 2:14 PM, Wolfgang Maier wolfgang.ma...@biologie.uni-freiburg.de wrote: On 24.07.2014 14:09, Chris “Kwpolska” Warrick wrote: On Thu, Jul 24, 2014 at 2:01 PM, Wolfgang Maier wolfgang.ma...@biologie.uni-freiburg.de wrote: Try something like this (assuming bash): python test.py if [ $? = 0 ]; then python second.py fi as your shell script. The [ ] and = should be doubled. ?? why that ? Double brackets can do more: http://stackoverflow.com/questions/2188199/how-to-use-double-or-single-bracket-parentheses-curly-braces -- Chris “Kwpolska” Warrick http://chriswarrick.com/ PGP: 5EAAEA16 stop html mail | always bottom-post | only UTF-8 makes sense ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Error Handling in python
On 24.07.2014 14:19, Chris “Kwpolska” Warrick wrote: python test.py if [ $? = 0 ]; then python second.py fi as your shell script. The [ ] and = should be doubled. ?? why that ? Double brackets can do more: http://stackoverflow.com/questions/2188199/how-to-use-double-or-single-bracket-parentheses-curly-braces But more is not required here. What am I missing ? ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Error Handling in python
On Thu, Jul 24, 2014 at 2:23 PM, Wolfgang Maier wolfgang.ma...@biologie.uni-freiburg.de wrote: On 24.07.2014 14:19, Chris “Kwpolska” Warrick wrote: python test.py if [ $? = 0 ]; then python second.py fi as your shell script. The [ ] and = should be doubled. ?? why that ? Double brackets can do more: http://stackoverflow.com/questions/2188199/how-to-use-double-or-single-bracket-parentheses-curly-braces But more is not required here. What am I missing ? It’s recommended to switch to the [[ syntax anyways, some people consider [ deprecated. Also, [ is actually /bin/[ while [[ lives in your shell (and is therefore faster). About the equals sign, == is the preferred syntax, and = is also considered deprecated (zsh explicitly says so, bash says “only for POSIX compatibility”. -- Chris “Kwpolska” Warrick http://chriswarrick.com/ PGP: 5EAAEA16 stop html mail | always bottom-post | only UTF-8 makes sense ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Error Handling in python
On 24.07.2014 14:37, Chris “Kwpolska” Warrick wrote: It’s recommended to switch to the [[ syntax anyways, some people consider [ deprecated. Also, [ is actually /bin/[ while [[ lives in your shell (and is therefore faster). About the equals sign, == is the preferred syntax, and = is also considered deprecated (zsh explicitly says so, bash says “only for POSIX compatibility”. I see. There is always something to learn, thanks (even if it's not Python-related as Steven points out correctly) :) ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
[Tutor] Inquiry
Please I would like to know about the Security and the Reliability of Python. Thank you ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
[Tutor] Security and Reliability of Python
I'm new at python and I would like to have knowledge about the Security and the Reliability factor of Python thank you. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
[Tutor] Read a file, Load a dictionary
I have been looking around for a way to read a comma delimited csv file and
then load it into a dictionary. So far any of my usual sources don't deal
with such simple stuff.
My current code is
# create a dictionary (dict) to store the order # and Remark
testVariables = {}
# Read the file and load the dict
input_file = open('test1Comma.csv', 'rU')
for line in input_file:
I'm stuck on the code that comes next. what line of code loads the dict?
my csv file has 2 lines shown below.
AUTO-TEST-0021,REMARK 1
AUTO-TEST-0022,REMARK 2
Thanks in advance for the help.
--
http://www.avant.ca/
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Re: [Tutor] Security and Reliability of Python
On 7/24/2014 3:11 AM, Allahondoum Mbaibarem wrote: I'm new at python and I would like to have knowledge about the Security and the Reliability factor of Python thank you. That's a pretty open-ended question. It's as secure and reliable as what you write. For most of us, it's as secure and reliable as we need it to be. :) Emile ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Read a file, Load a dictionary
On 7/24/2014 3:50 PM, Glenn Lester wrote: I have been looking around for a way to read a comma delimited csv file start with the csv module. http://www.python.org/doc/current/lib/module-csv.html DESCRIPTION This module provides classes that assist in the reading and writing of Comma Separated Value (CSV) files... and then load it into a dictionary. Emile ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Read a file, Load a dictionary
Glenn Lester gles...@avant.ca Wrote in message: ? You forgot to make your message a text one, and also omitted your Python version. So I'll respond from memory, assuming you're using version 3.5 The csv reader can make a dictionary from each line of the csv file. So you can readily make a list of dicts. https://docs.python.org/3.5/library/csv.html -- DaveA ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Security and Reliability of Python
Allahondoum Mbaibarem allahondoum1...@gmail.com Wrote in message: ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor Post here using text messages, not html. Wait 24 hours, not one, before slamming us with a duplicate query. And when refining an existing thread, use reply-list, not a new message with a different subject line. Any further responses, please use the original thread. -- DaveA ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Inquiry
Allahondoum Mbaibarem allahondoum1...@gmail.com Wrote in message: (use text messages here) Python is no more secure than the code written in it. It is very reliable, according to the experience of thousands of users. Much of that comes from it being open-source; many eyes catch the bugs faster than anything proprietary. Compared to what? -- DaveA ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Inquiry
On Jul 24, 2014 3:21 PM, Allahondoum Mbaibarem allahondoum1...@gmail.com wrote: Please I would like to know about the Security and the Reliability of Python. This is somewhat outside the domain of python-tutor discussion. You may want to contact the folks at: http://www.pythonsecurity.org instead. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Read a file, Load a dictionary
assuming you're using version 3.5 How do you get version 3.5? Python.org shows 3.41 as being the latest. Deb in WA, USA FREE ONLINE PHOTOSHARING - Share your photos online with your friends and family! Visit http://www.inbox.com/photosharing to find out more! ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Read a file, Load a dictionary
Deb Wyatt codemon...@inbox.com Wrote in message: assuming you're using version 3.5 How do you get version 3.5? Python.org shows 3.41 as being the latest. I could as easily figured 2.6. My point is that people need to specify what version they're asking about. 3.5 is a dev version. Not for production nor for learning python one gets it by fetching from the repository and doing their own compile. -- DaveA ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Read a file, Load a dictionary
On Thu, Jul 24, 2014 at 10:25:59PM -0400, Dave Angel wrote: Deb Wyatt codemon...@inbox.com Wrote in message: assuming you're using version 3.5 How do you get version 3.5? Python.org shows 3.41 as being the latest. I could as easily figured 2.6. My point is that people need to specify what version they're asking about. Does the version number make much of a difference in this case? 3.5 is a dev version. Not for production nor for learning python one gets it by fetching from the repository and doing their own compile. Do you figure that many beginners to Python are doing that? -- Steven ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Security and Reliability of Python
On Thu, Jul 24, 2014 at 10:11:41AM +, Allahondoum Mbaibarem wrote: I'm new at python and I would like to have knowledge about the Security and the Reliability factor of Python thank you. Python is very reliable. The language has been around for over 20 years, and is in use in tens of thousands if not more sites. Python is actively maintained, so when problems are reported, they are dealt with promptly. But of course it is a programming language, which means the reliablity of code you write depends on *your* skill at programming. If you write buggy code, Python cannot save you from your own errors. However, unlike low-level languages like C, you should not be able to cause a core dump or operating-system crash from Python code. (If you ever do find one of those, except for the ctypes module which is special, it is a bug in Python and should be reported immediately. But you won't: I've been using Python for over 15 years and have never managed to cause a core dump from Python code.) Likewise, in Python you cannot have dangling pointer errors, buffer overflows, or any of those similar critical errors which lead to security failures. The worst you can have is an uncaught exception, which causes the Python process to write a traceback to standard error and exit. Python is only as secure as the code *you* write. If you write code where you accept text from untrusted people over the Internet and then execute it as code using eval() or exec(), then your code is vulnerable to code injection attacks. The solution to this is simple: don't use eval() or exec() on untrusted data. There is hardly ever a need to use eval() or exec() in your own code. In 15 years, I've only used them a handful of times, and then mostly for experiments. -- Steven ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Security and Reliability of Python
Python is only as secure as the code *you* write. If you write code where you accept text from untrusted people over the Internet and then execute it as code using eval() or exec(), then your code is vulnerable to code injection attacks. The solution to this is simple: don't use eval() or exec() on untrusted data. There is hardly ever a need to use eval() or exec() in your own code. In 15 years, I've only used them a handful of times, and then mostly for experiments. And we have to fight the good fight. There are people out there who think that eval() is fine to teach to beginners. I do not understand why. As a concrete example that I came across today: https://plus.google.com/111222510165686226339/posts/jQrn9vkGxHA Such teaching makes me very sad. We have to really fight this hard to keep people from writing dangerous code. It's a bit frustrating because the teacher there obviously knows enough to be dangerous, yet not enough to be respectfully cautious. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
