python - Pandas if/then/else logic -

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i have dataframe looks this,

 df=pd.dataframe([2,4,6,2],columns=['x'])  df['y']=[3,2,1,2]  df['x_test']=['x_larger','x_larger','x_smaller','x_equal']

i trying if/then/else, similar idiom , cookbook. able 1 if statement correct not sure how test equal.

df['valid']=false df['invalid']=true df.ix[(df.x_test=="x_larger") & (df.x>df.y),['valid','invalid']]=[true,false]

this works partially. test x_equal in line. possible?

the desired output should be

    x  y     x_test  valid invalid 0  2  3   x_larger  false    true 1  4  2   x_larger   true   false 2  6  1  x_smaller  false    true 3  2  2    x_equal   true   false


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