the output of re.split in python doesn't make sense to me -

- 

print (re.split(r'[a-fa-f]','finqwenlaskdjriewasfsdfddsafsafasa',re.i|re.m)) print (re.split(r'[a-fa-z]','finqwenlaskdjriewasfsdfddsafsafasa',re.i|re.m)) print (re.split(r'\d*','sdfsfdsfds123212fdsf2')) print (re.split(r'\d','sdfsfdsfds123212fdsf2')) print (re.split(r'\w+','dsfsf sdfdsf sdfsdf sfsfd'))  ['', 'inqw', 'nl', 'sk', 'jri', 'w', 's', 's', '', '', 'dsafsafasa'] ['', 'inqw', 'nl', 'sk', 'jri', 'w', 's', '', '', '', 'ddsafsafasa'] ['sdfsfdsfds', 'fdsf', ''] ['sdfsfdsfds', '', '', '', '', '', 'fdsf', ''] ['', ' ', ' ', ' ', '']

i think output here weird. pattern split string turned '' in output list sometimes, disappear other time.

the pattern split string turned '' in output list sometimes, disappear other time.

no, pattern (or matched) never included in outputs there. '' what's between matches. because that's re.split does. example:

>>> re.split(r'\d','sdfsfdsfds123212fdsf2') ['sdfsfdsfds', '', '', '', '', '', 'fdsf', '']

you're splitting digits, , substring '123212' has 6 digits, there 5 empty strings between them. that's why there 5 empty strings in output there.


Comments

Post a Comment

Popular posts from this blog

matlab - error with cyclic autocorrelation function -

-
Image
i'm trying code cyclic autocorrelation function in matlab follows: t=0:(n-1); t=t*te; i_alpha=0; tau=-n2*te:te:n2*te; alpha=-1/2:1/n:1/2; ryy_cl=zeros(length(alpha),length(tau)); alpha=alpha/te ind_tau=0; i_alpha=i_alpha+1; k=tau ind_tau=ind_tau+1; if k>0 % ryy_cl(i_alpha,ind_tau)=1/length(sig_bin_syl_mod(1:end- k))*sum((sig_bin_syl_mod(1:end-k)).*sig_bin_syl_mod(k+1:end)).*exp(1i*2*pi*alpha*t(1+k:length(sig_bin_syl_mod(1:end)))); ryy_cl(i_alpha,ind_tau)=(1/n)*sum((sig_bin_syl_mod(1:end-k)).*sig_bin_syl_mod(k+1:end)).*exp(-1i*2*pi*alpha*t(1:end-k)); else ryy_cl(i_alpha,ind_tau)=(1/n)*sum((sig_bin_syl_mod(1-k:end)).*sig_bin_syl_mod(1:end+k)).*exp(-1i*2*pi*alpha*t(1-k:end)); end end end i'm getting errors, , doesn't show expecting. according below formulae, how can fix it? the code provided incomplete, difficult confidently reproduce error. in particular, haven't de...
Read more

django - (fields.E300) Field defines a relation with model 'AbstractEmailUser' which is either not installed, or is abstract -

-
i trying create customuser django project email username , add radio button truck , company. in registration process email-id registered per truck or company. mentioned radio button 'tag' , add manytomany field tag in emailuser model. when makemigrations, raising error : (fields.e300) field defines relation model 'abstractemailuser' either not installed, or abstract. i quite new django , not sure whether have created correct code wants. please me solving this. here code, models.py: import django django.contrib.auth.models import ( abstractbaseuser, baseusermanager, permissionsmixin) django.core.mail import send_mail django.db import models django.utils import timezone django.utils.translation import ugettext_lazy _ class emailusermanager(baseusermanager): """custom manager emailuser.""" def _create_user(self, email, password, is_staff, is_superuser, **extra_fields): """create , save emailus...
Read more

c# - What is a good .Net RefEdit control to use with ExcelDna? -

-
i using exceldna , c# build suite of tools. part of forms i'd want user select cells/ranges workbook. i've got application.inputbox route working...but doesn't cool... i haven't read many things excel's refedit control, , see many have in past written workarounds, in (shudder) vba or vb.net. however, none of these seem recent... best approach/control refedit functionality on form run via exceldna (if applicable)? the refedit sample project of github explores different ways of dealing threading when showing form excel add-in, main issue making refedit control .net add-in. check page links various other implementations: https://github.com/excel-dna/exceldna/wiki/links-about-refedit
Read more