infile = open('Fdeg.dat','r')

for i in range(3):
    infile.readline()

Fdegrees = []
Cdegrees = []

for line in infile:
    F = float(line.split()[-1])
    C = (F-32)*5.0/9
    Fdegrees.append(F)
    Cdegrees.append(C)

infile.close()

outfile = open('F2C.txt','w')

for F,C in zip(Fdegrees,Cdegrees):
    outfile.write('%4.2f %4.2f \n' %(F,C))

outfile.close()

"""
Terminal> python f2c_file_read_write.py
Terminal> more F2C.txt
67.20 19.56
66.00 18.89
78.90 26.06
102.10 38.94
32.00 0.00
87.80 31.00
"""