I want to exception handle list index out of range

Question

I am using BeautifulSoup and parsing some HTMLs   I m getting a certain data from each HTML  using for loop  and adding that data to a certain list   The problem is  some of the HTMLs have different format  and they don t have the data that I want in them    So  I was trying to use exception handling and add value null to the list  I should do this since the sequence of data is important    For instance  I have a code like   soup   BeautifulSoup links  dlist   soup findAll  dd    title     I m trying to find content between  lt dd class  title  gt  and  lt  dd gt  gotdata   dlist 1    and what i want is the 2nd content of those newlist append gotdata    and I add that to a newlist   and some of the links don t have any  lt dd class  title  gt   so what I want to do is add string null to the list instead   The error appears    list index out of range    What I have done tried is to add some lines like this   if not dlist 1        newlist append  null      continue   But it doesn t work out  It still shows error   list index out of range    What should I do about this  Should I use exception handling  or is there any easier way   Any suggestions  Any help would be really great

User · Answer

A ternary will suffice  change   gotdata   dlist 1    to  gotdata   dlist 1  if len dlist   gt  1 else  null    this is a shorter way of expressing  if len dlist   gt  1      gotdata   dlist 1  else       gotdata    null

User · Answer

You have two options  either handle the exception or test the length   if len dlist   gt  1      newlist append dlist 1       continue   or  try      newlist append dlist 1   except IndexError      pass continue   Use the first if there often is no second item  the second if there sometimes is no second item

User · Answer

for i in range  1  len list       try          print  list i        except ValueError          print  Error Value        except indexError          print  Erorr index       except           print  error

User · Answer

Handling the exception is the way to go   try      gotdata   dlist 1  except IndexError      gotdata    null    Of course you could also check the len   of dlist  but handling the exception is more intuitive

User · Answer

For anyone interested in a shorter way  gotdata   len dlist  gt 1 and dlist 1  or  null   But for best performance  I suggest using False instead of  null   then a one line test will suffice  gotdata   len dlist  gt 1 and dlist 1

User · Answer

Taking reference of ThiefMaster  sometimes we get an error with value given as   n  or null and perform for that required to handle ValueError   Handling the exception is the way to go  try      gotdata   dlist 1  except  IndexError  ValueError       gotdata    null

[python] I want to exception handle 'list index out of range.'

Examples related to python

Examples related to list

Examples related to exception-handling