Deleting DataFrame row in Pandas based on column value

I have the following DataFrame:

                 daysago  line_race rating        rw    wrating
     line_date                                                 
     2007-03-31       62         11     56  1.000000  56.000000
     2007-03-10       83         11     67  1.000000  67.000000
     2007-02-10      111          9     66  1.000000  66.000000
     2007-01-13      139         10     83  0.880678  73.096278
     2006-12-23      160         10     88  0.793033  69.786942
     2006-11-09      204          9     52  0.636655  33.106077
     2006-10-22      222          8     66  0.581946  38.408408
     2006-09-29      245          9     70  0.518825  36.317752
     2006-09-16      258         11     68  0.486226  33.063381
     2006-08-30      275          8     72  0.446667  32.160051
     2006-02-11      475          5     65  0.164591  10.698423
     2006-01-13      504          0     70  0.142409   9.968634
     2006-01-02      515          0     64  0.134800   8.627219
     2005-12-06      542          0     70  0.117803   8.246238
     2005-11-29      549          0     70  0.113758   7.963072
     2005-11-22      556          0     -1  0.109852  -0.109852
     2005-11-01      577          0     -1  0.098919  -0.098919
     2005-10-20      589          0     -1  0.093168  -0.093168
     2005-09-27      612          0     -1  0.083063  -0.083063
     2005-09-07      632          0     -1  0.075171  -0.075171
     2005-06-12      719          0     69  0.048690   3.359623
     2005-05-29      733          0     -1  0.045404  -0.045404
     2005-05-02      760          0     -1  0.039679  -0.039679
     2005-04-02      790          0     -1  0.034160  -0.034160
     2005-03-13      810          0     -1  0.030915  -0.030915
     2004-11-09      934          0     -1  0.016647  -0.016647

I need to remove the rows where line_race is equal to 0. What's the most efficient way to do this?

If I'm understanding correctly, it should be as simple as:

    df = df[df.line_race != 0]

From: stackoverflow.com/q/18172851

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