Question

我目前正在Python中为学校项目编写一个ascii-binary / binary-ascii转换器，我有一个从ascii（String text）转换为二进制文件的问题。我们的想法是在代码底部的test（）中打印结果。

在WingIDE中运行代码时，会发生错误：在以

开头的行上

bnary = bnary + binary[chnk]

KeyError：＆＃34;挪威以30:28击败波兰并破坏Bielecki的生日派对。＆＃34;

我在这里尝试做的是转换存储在＆＃34; text.txt＆＃34;中的文本字符串。到一个整数字符串，然后打印这个二进制字符串。

非常感谢任何帮助。我试着查看其他ascii-binary反之亦然转换相关问题，但似乎没有一个对我有用。

我的代码：

def code():    
    binary = {}
    ascii = {}

    # Generate ascii code
    for i in range(0,128) :
        ascii[format(i,'08b')] = chr(i)


    # Reverse the ascii code, this will be binary
    for k, v in ascii.iteritems():
        binary[v] = binary.get(v, [])
        binary[v].append(k)   

    return ascii

def encode(text,binary):
    '''
    Encode some text using text from a source
    '''
    bnary = ""

    fi = open(text, mode='rb')
    while True:
        chnk = fi.read()
        if chnk == '':
            break
        if chnk != '\n':

            binry = ""

            bnary = bnary + binary[chnk]

        return bnary

def decode(sourcecode,n, ascii):
    '''
    Decode a sourcecode using chunks of size n
    '''

    sentence = ""    

    f = open(sourcecode, mode='rb') # Open a file with filename <sourcecode>
    while True:
        chunk = f.read(n)           # Read n characters at time from an open file
        if chunk == '':             # This is one way to check for the End Of File in Python 
            break
        if chunk != '\n':

            setence = ""            # The ascii sentence generated

            # create a sentence
            sentence = sentence + ascii[chunk]

    return sentence

def test():
    '''
    A placeholder for some test cases.
    It is recommended that you use some existing framework, like unittest,
    but for a temporary testing in a development version can be done 
    directly in the module.
    '''

    print encode('text.txt', code())
    print decode('sourcecode.txt', 8, code())

test()

Answer 1

如果您想要解码和编码，请使用此解决方案

将ascii编码到bin

def toBinary(string):
    return "".join([format(ord(char),'#010b')[2:] for char in string])

将bin编码为ascii

def toString(binaryString):
    return "".join([chr(int(binaryString[i:i+8],2)) for i in range(0,len(binaryString),8)])

Answer 2

fi.read（）第一次和“下次”返回整个文档。所以你应该做

text = fi.read()
for char in text:
     do_stuff()

<强> EDIT1

您只能阅读一次文件。因此，你必须逐个获取你的字符。 file.read返回包含整个文档的字符串。

您可以遍历字符串以逐个获取字符。

主要错误是您的binary是{"a":['010001110'], "b":...}并且您尝试使用密钥"azerty"进行访问，您应该通过char来执行char：

string = "azer"
result = []
for c in string:
    result += binary[c]

 >>> result = [['11001'],[1001101'],...]

Answer 3

# Lets say your filename is stored in fname

def binary(n):
    return '{0:08b}'.format(n)

with open(fname) as f:
    content = f.readlines()
    for i in content:
        print(binary(ord(i)), end='')
    print('')

这将为您提供文件中每个字符的整数值（来自ascii），逐行

将二进制转换为ASCII，将ASCII转换为二进制

3 个答案: