"""
Exercise 4.4 from "A Primer on...
Read data from file, store data in lists,
then write to another file in a
different format.
"""

#Part 1: read and store in lists

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

#skip the first three lines:
for i in range(3):
    infile.readline()

F_list = []
C_list = []

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

infile.close()

#Part 2: write data in lists to a new file
outfile = open('outfile.txt','w')

for F,C in zip(F_list,C_list):
    outfile.write(f'{F:6.2f} {C:6.2f}\n')

outfile.close()

"""
Terminal> python f2c_file_read_write.py
Terminal> more outfile.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
"""