Data transformation loop

Input file format: two columns with numbers
0.1   1.4397
0.2   4.325
0.5   9.0
Read a line with x and y, transform y, write x and f(y):
for line in ifile:
    pair = line.split()
    x = float(pair[0]); y = float(pair[1])
    fy = myfunc(y)  # transform y value
    ofile.write('%g  %12.5e\n' % (x,fy))

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