Re: [Tutor] Virtual environment question
you are talking about different sides of isolation. you install into a virtualenv and those pkgs don't go into the system area. that says nothing about using existing bits of the system... On March 12, 2018 6:31:47 PM PDT, Jim wrote: >On 03/12/2018 04:04 AM, eryk sun wrote: >> On Mon, Mar 12, 2018 at 12:44 AM, Jim wrote: >>> >>> home = /usr/bin >>> include-system-site-packages = false >> [...] >>> resp = opener.open(request, timeout=self._timeout) >>>File "/usr/lib/python3.5/urllib/request.py", line 466, in open >> >> This is normal. Virtual environments are not isolated from the >standard library. > >Interesting. All I know about virtual environments is what I read on >the >net. I always see them recommended as a way to keep from messing up the > >default python, so I thought isolation was their purpose. > >Thanks, Jim > > >___ >Tutor maillist - Tutor@python.org >To unsubscribe or change subscription options: >https://mail.python.org/mailman/listinfo/tutor -- Sent from my Android device with K-9 Mail. Please excuse my brevity. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Virtual environment question
On Tue, Mar 13, 2018 at 1:31 AM, Jim wrote: > On 03/12/2018 04:04 AM, eryk sun wrote: >> >> On Mon, Mar 12, 2018 at 12:44 AM, Jim wrote: >>> >>> home = /usr/bin >>> include-system-site-packages = false >> >> [...] >>> >>> resp = opener.open(request, timeout=self._timeout) >>>File "/usr/lib/python3.5/urllib/request.py", line 466, in open >> >> This is normal. Virtual environments are not isolated from the standard >> library. > > Interesting. All I know about virtual environments is what I read on the > net. I always see them recommended as a way to keep from messing up the > default python, so I thought isolation was their purpose. You're thinking of isolating packages that are installed in site-packages, not the standard library. There's no point in copying and recompiling the entire standard library in every virtual environment. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Virtual environment question
On 03/12/2018 04:04 AM, eryk sun wrote: On Mon, Mar 12, 2018 at 12:44 AM, Jim wrote: home = /usr/bin include-system-site-packages = false [...] resp = opener.open(request, timeout=self._timeout) File "/usr/lib/python3.5/urllib/request.py", line 466, in open This is normal. Virtual environments are not isolated from the standard library. Interesting. All I know about virtual environments is what I read on the net. I always see them recommended as a way to keep from messing up the default python, so I thought isolation was their purpose. Thanks, Jim ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] prime factorisation
I think You would do much better if You wrote pseudo code first, i.e. write each step out in words, code is much easier to write following pseudo code Are You trying to factor Prime Numbers? Prime Number factored (Prime Number and 1) https://en.wikipedia.org/wiki/Table_of_prime_factors#1_to_100 https://www.mathsisfun.com/prime-factorization.html ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] prime factorisation
Hello Bernd,
My comments below, interleaved with yours.
On Sun, Mar 11, 2018 at 04:23:02PM +0100, Bernd Hewener wrote:
> Functions for reading in the number and finding the primes are working
> alright (of Course, finding primes up to ½ Number would suffice).
Actually you only need to go up to square root of the number.
> Still, the function for finding the factorization itsel does not work.
> I am not sure, but the number i running through the primes for
> checking does not seem to work properly.
What do you mean, does not work? In what way?
When you run the code, what does it do?
Some further comments:
[...]
> def readin():
> print ("Readin")
> while True:
> num = input("Please enter a positive integer n for prime
> factorization. ")
> try:
> n = int(num)
> return n
> except ValueError or num < 1:
> print("Please enter a _positive_ integer!")
> else:
> break
That code doesn't actually do what you think it does. In fact, it is an
accident that it works at all!
The problem is the line
except ValueError or num < 1
which does *not* catch a ValueError and check that num is less than one.
Instead, it evaluates to just catching ValueError. So it never checks
that the entered number is positive.
Regards,
Steve
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Re: [Tutor] Virtual environment question
On Mon, Mar 12, 2018 at 12:44 AM, Jim wrote: > > home = /usr/bin > include-system-site-packages = false [...] > resp = opener.open(request, timeout=self._timeout) > File "/usr/lib/python3.5/urllib/request.py", line 466, in open This is normal. Virtual environments are not isolated from the standard library. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
