def _read_log(fname):
"""
Read a log file 'fname' to produce instance of Config and Records.
"""
print(f'Reading data from: {fname}')
cf = Config()
rs = Records()
with open(fname, 'r') as f:
cf.readin(f)
skip_lines(3, f)
rs.runs = [int(f.readline().split()[2])]
rs.seed = [int(f.readline().split()[2])]
rs.lattice_dims = [int(x) for x in f.readline().split()[2:]]
skip_lines(4, f)
while True:
r = Records.read(f)
if r == '' or r[0] == '\n':
break
rs.add(r)
print(f'read in: {len(rs.inds)} records')
return cf, rs
