CODEWITHSUNDEEP
pythonindexing
dbs
dbs

Reputation: 35

python index() not working

I am trying to print the filename 'xyz.0.html' in the console. It is spitting out an error "substring not found"

files in directory:

xyz.0.html
xyz.1.html
xyz.2.html

python

for name in glob.glob('*html'):
  if name.index('.0.html'):
    print name

Upvotes: 2

Views: 4943

Answers (5)

Pooya
Pooya

Reputation: 4481

you can use python's generator 

print [name for name in glob.glob('*html') if name.endswith(".0.html")]

Upvotes: 0

Vincent Savard
Vincent Savard

Reputation: 35947

Why not use str.endswith()?

>>> "xyz.0.html".endswith(".0.html")
True

Upvotes: 5

BrenBarn
BrenBarn

Reputation: 251608

The error is just what it says. When you call name.index('0.html') on the name "xyz.1.html", the string is not found. index raises an error in this case. If you don't want this, you can use the find method instead (which returns -1 if the substring is not found), or you can catch the exception.

Upvotes: 2

mgilson
mgilson

Reputation: 310297

you probably want

if '.0.html' in name:

Or,

if name.endswith('.0.html'):

Your version raises an error if the substring isn't in the string (and it will evaluate to False if the substring is at the start of the string) since the index method returns the index in the string where the substring was found (or raises an exception if the substring wasn't found).

Upvotes: 2

Joran Beasley
Joran Beasley

Reputation: 114108

try

if ".0.html" in name: 
   print name

or

if name.endswith(".0.html"):
      print name

Upvotes: 2

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