Finding smallest float in file then printing that and line above it

Question

My data file looks like this:

3.6-band 
6238
Over
0.5678
Over
0.6874
Over
0.7680
Over
0.7834

What I want to do is to pick out the smallest

Answer 1

I see some interesting solutions above. I would go for this straightforward solution. There is one problem left, which is that integers might be taken like this as well. Anyone a solution for this?

    df=open('myfile.txt')
    lines=df.readlines()
    minval = 1e99
    for n,line in enumerate(lines):
        try: 
            val=float(line)  # NB! like this, also integers will be taken. 
            if val < minval:  
                minval = val
                i_min  = n  
        except:
            pass
    word = lines[i_min-1]