我正在开发一个相当基本的编码器/解码器，您可以在其中输入自己的文本文件（作为字符串）和自己的编码器（也作为字符串：它必须是文本文件）。
这是我的解码器功能：
def cDecode(file_name, encoder='standard_encoder.txt', save_new=True): # does not decode multi-lines correctly -- everything goes on a single line. See next comment
'''Decodes <'file_name'> with the reverse method of <'encoder'>.'''
if type(file_name) != str or type(encoder) != str: raise TypeError("<'file_name'> and <'encoder'> must be of type <'str'>.")
if type(save_new) != bool: raise TypeError("<'save_new'> must be of type <'bool'>.")
if file_name[-4:] != '.txt': file_name += '.txt'
if encoder[-4:] != '.txt': encoder += '.txt'
decoder_set = {}
try:
with open(encoder, 'r') as encoding_file:
for line in encoding_file:
line_parts = line.split(': ')
my_key, my_value = line_parts[1], line_parts[0]
我认为错误在这里：我必须删除'\ n'，因为每个字符（在解码文件中）都在一个新行上，例如：'A：Ð'。
if '\n' in my_key:
loc = my_key.find('\n') # this may be the cause of the single-line of the decoding.
my_key = my_key[:loc] + my_key[loc + 1:]
decoder_set[my_key] = my_value
encoding_file.close()
except IOError:
encoder = 'standard_encoder.txt'
with open(encoder, 'r') as encoding_file:
for line in encoding_file:
line_parts = line.split(': ')
my_key, my_value = line_parts[1], line_parts[0]
# every key has a new line character automatically because it's on a different line
if '\n' in my_key:
loc = my_key.find('\n')
my_key = my_key[:loc] + my_key[loc + 1:]
decoder_set[my_key] = my_value
encoding_file.close()
decodingKeys = decoder_set.keys()
这是函数的其余部分：
if save_new:
try:
decoded_file_name = file_name[:-12] + '_decoded' + file_name[-4:]
encoded_file = open(decoded_file_name, 'a+')
with open(file_name, 'r') as my_file:
for line in my_file:
de_line = ''
for char in line:
if char in decodingKeys: de_char = decoder_set[char]
else: de_char = char
de_line += de_char
encoded_file.write(de_line)
except IOError:
raise NameError(file_name + ' was not found. Decoding process terminated.')
else:
try:
import os
encoded_file = file_name[:-12] + '_decoded' + file_name[-4:]
with open(file_name, 'r+') as my_file:
for line in my_file:
de_line = ''
for char in line:
if char in decodingKeys: en_char = decoding_set[char]
else: de_char = char
de_line += de_char
encoded_file.write(de_line)
os.remove(file_name)
os.rename(encoded_file, file_name)
except IOError:
raise NameError(file_name + ' was not found. Decoding process terminated.')
假设我有一个多行文本文件：
This is a test.
As is this one.
Good bye!
当编码然后解码时，它显示如下：This is a test.As is this one.Good bye!.
我怎样才能解决这个问题？我希望它会显示为：
This is a test.
As is this one.
Good bye!
谢谢！