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You can also specify the details using the command slider. The syntax is:

slider(a,b,step,start_value)

For example, you might have the following:

@interact
def _(a=slider(0.1,5.0,0.1,3)):
print a


This defines a slider with values from 0.1 to 5 that steps by 0.1, and the interact will launch with the slider set to 3.