human
Solve the following python programming problem given the following code:
@ cleanup 
def test_geom_abline_functions() : 
    df = _build_line_df () 
    def sfunc(x, y) : 
        return ((y.iloc [(- 1)] - y.iloc [0]) / (x.iloc [(- 1)] - x.iloc [0])) 
def ifunc(x, y) : 
        return np.mean (y) 
gg = ggplot (df, aes (x = 'wt', y = 'mpg')) 
    gg = ((gg + geom_point ()) + geom_abline (aes (x = 'wt', y = 'mpg'), slope = sfunc, intercept = df)) 
    assert_same_ggplot (gg, 'geom_abline_functions') 

    
    

    Fix the buggy line: gg = ((gg + geom_point ()) + geom_abline (aes (x = 'wt', y = 'mpg'), slope = sfunc, intercept = df))
assistant
#Here is Python program to fix the buggy line: gg = ((gg + geom_point ()) + geom_abline (aes (x = 'wt', y = 'mpg'), slope = sfunc, intercept = df))
.

gg = ((gg + geom_point ()) + geom_abline (aes (x = 'wt', y = 'mpg'), slope = sfunc, intercept = def ifunc())