IndentationError unexpected indent error

Question

I am new to Python and am getting this error   Traceback  most recent call last     File   usr local bin scrapy   line 4  in  lt module gt      execute     File   opt local Library Frameworks Python framework Versions 2 6 lib python2 6 site-packages scrapy cmdline py   line 130  in execute      run print help parser   run command  cmd  args  opts    File   opt local Library Frameworks Python framework Versions 2 6 lib python2 6 site-packages scrapy cmdline py   line 96  in  run print help     func  a    kw    File   opt local Library Frameworks Python framework Versions 2 6 lib python2 6 site-packages scrapy cmdline py   line 136  in  run command     cmd run args  opts    File   opt local Library Frameworks Python framework Versions 2 6 lib python2 6 site-packages scrapy commands crawl py   line 42  in run     q   self crawler queue   File   opt local Library Frameworks Python framework Versions 2 6 lib python2 6 site-packages scrapy command py   line 31  in crawler     self  crawler configure     File   opt local Library Frameworks Python framework Versions 2 6 lib python2 6 site-packages scrapy crawler py   line 36  in configure     self spiders   spman cls from settings self settings    File   opt local Library Frameworks Python framework Versions 2 6 lib python2 6 site-packages scrapy spidermanager py   line 33  in from settings     return cls settings getlist  SPIDER MODULES      File   opt local Library Frameworks Python framework Versions 2 6 lib python2 6 site-packages scrapy spidermanager py   line 23  in   init       for module in walk modules name     File   opt local Library Frameworks Python framework Versions 2 6 lib python2 6 site-packages scrapy utils misc py   line 65  in walk modules     submod     import   fullpath                  File   my crawler empt empt spiders empt spider py   line 59     check exists sql    SELECT   FROM LINKS WHERE link     s  LIMIT 1    item  link         IndentationError  unexpected indent   On this bit of code   def parse item self  response       hxs   HtmlXPathSelector response      sites   hxs select    a contains  href    mp3     href   extract       items             for site in sites           link   site select  a  href   extract            print site     for site in sites          item   EmptItem           item  link     site  site select  a  href   extract                 DB INSERT ATTEMPT              MySQL Test           open db connection         db   MySQLdb connect  localhost   root   str0ng   TESTDB             prepare a cursor object using cursor   method         cursor   db cursor             see if any links in the DB match the crawled link         check exists sql    SELECT   FROM LINKS WHERE link     s  LIMIT 1    item  link            cursor execute check exists sql           if cursor rowcount   0               prepare SQL query to insert a record into the db              sql    INSERT INTO LINKS   link   VALUES     s      item  link                try                   execute the sql command                 cursor execute sql                   commit your changes to the db                 db commit               except                   rollback on error                 db rollback                     fetch a single row using fetchone   method                   data   cursor fetchone                     print  Database version   s     data               disconnect from server             db close                    end mysql          items append item      return items

User · Answer

The indentation is wrong  as the error tells you  As you can see  you have indented the code beginning with the indicated line too little to be in the for loop  but too much to be at the same level as the for loop  Python sees the lack of indentation as ending the for loop  then complains you have indented the rest of the code too much   The def line I m betting is just an artifact of how Stack Overflow wants you to format your code    Edit  Given your correction  I m betting you have a mixture of tabs and spaces in the source file  such that it looks to the human eye like the code lines up  but Python considers it not to  As others have suggested  using only spaces is the recommended practice  see PEP 8   If you start Python with python -t  you will get warnings if there are mixed tabs and spaces in your code  which should help you pinpoint the issue

User · Answer

While the indentation errors are obvious in the StackOverflow page  they may not be in your editor  You have a mix of different indentation types here  1  4 and 8 spaces  You should always use four spaces for indentation  as per PEP8  You should also avoid mixing tabs and spaces    I also recommend that you try to run your script using the  -tt  command-line option to determine when you accidentally mix tabs and spaces  Of course any decent editor will be able to highlight tabs versus spaces  such as Vim s  list  option

User · Answer

The error is pretty straightforward - the line starting with check exists sql isn t indented properly  From the context of your code  I d indent it and the following lines to match the line before it       open db connection    db   MySQLdb connect  localhost   root   str0ng   TESTDB        prepare a cursor object using cursor   method    cursor   db cursor        see if any links in the DB match the crawled link    check exists sql    SELECT   FROM LINKS WHERE link     s  LIMIT 1    item  link       cursor execute check exists sql    And keep indenting it until the for loop ends  all the way through to and including items append item

User · Answer

This error occur when you don t correctly write blocks  Forgetting a  quot   quot   or not using  quot Tab quot  button for blocks and use spaces  When you are transporting a code from one editor to another editor it can happen  And never forget this  errors aren t always on that line  I came here for this  but I ve forgotten an except after a try  because of my unstandard editor  it happend  But it s possible in normal editor

User · Answer

import urllib request import requests from bs4 import BeautifulSoup          r   requests get  https   icons8 com icons set favicon    If you try to connect to such a site  you will get an indent error  import urllib request import requests from bs4 import BeautifulSoup   r   requests get  https   icons8 com icons set favicon    Python cares about indents

User · Answer

As the error says you have not correctly indented code  check exists sql is not aligned with line above it cursor   db cursor      Also use 4 spaces for indentation   Read this http   diveintopython net getting to know python indenting code html

[python] IndentationError: unexpected indent error

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