关于字符串：在Python 2.7和3.5中进行类型转换，如何使我的2.7代码在3.5下工作？

Type conversion in Python 2.7 vs 3.5, how to make my 2.7 code work under 3.5?

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我将2.7代码移植到3.5中，2.7代码工作正常。在运行2to3并更改旧代码中的明显代码后，我仍然会收到以下错误消息：

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Exception in thread Thread-7:
Traceback (most recent call last):
File"C:\Users\Anaconda3\lib\threading.py", line 914, in _bootstrap_inner
self.run()
File"C:\Users\Anaconda3\lib\threading.py", line 862, in run
self._target(*self._args, **self._kwargs)
File"<ipython-input-2-eadc3d59ae9f>", line 70, in receiveData
nftp = self.parseNFTPData(stringBuffer(data[:-1]))
File"<ipython-input-2-eadc3d59ae9f>", line 101, in parseNFTPData
current_string += c
TypeError: Can't convert 'int' object to str implicitly

我确实理解这个错误，但是为什么在Python3而不是2下会出现这个错误？在我看来，这是一个语法问题？？？？

代码如下：

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def parseNFTPData(self, strbuf):
quote = False
result = []
current_string =""

while not strbuf.eof():
c = strbuf.read()
if c ==""":
if quote:
quote = False
else:
quote = True
elif c =="(" and not quote:
list = self.parseNFTPData(strbuf)
result.append(list)
elif c ==")" and not quote:
result.append(self.typeConvert(current_string))
strbuf.read()
return result
elif len(current_string) > 0 and c =="" and not quote:
result.append(self.typeConvert(current_string))
current_string =""
else:
current_string += c

if len(current_string) > 0:
result.append(self.typeConvert(current_string))
return result

号

"strbuf"属于StringBuffer类：

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class stringBuffer:
def __init__(self, string):
self.buffer = string
self.readptr = 0

def read(self):
if self.readptr < len(self.buffer):
readc = self.buffer[self.readptr]
self.readptr += 1
else:
readc = False
return readc

def eof(self):
if self.readptr >= len(self.buffer):
return True
else:
return False

def peek(self):
return self.buffer[self.readptr]