# Revised Pseudo-Code:
#
# Import the code features that allow remote file access
# Open the file from Uniprot
#
# Read the first Line of the file (into the variable Line)
#
# While the file is not exhausted (i.e. Line is not empty)
#     Print the current line (without decoding or explicit Newline)
#     Read the next line of the file (into the variable Line)
#
# Tidily close the remote file
##################################################################

import urllib.request # import the code to access remote files. 

# Open remote file for reading.
File_URL = 'http://www.uniprot.org/uniprot/P12931.fasta'
Sequence_file = urllib.request.urlopen(File_URL)

Line = Sequence_file.readline()     # Read the first line using readline()
while Line:                         # While the contents of Line are not empty, 
    print(Line)                     # print the current Line,
    Line = Sequence_file.readline() # read the next line using readline(),
                                    # go round for more.

Sequence_file.close() # Close file tidily.