Python C API - Issue with string as arugments

[JRHeisey]

Greetings,

Using Python 3.4.3

• I am creating a PyUnicode string from a C string.
  
• I am passing this string as a argument to a Python function from C.
  
• In the setter function I can print out parameter.
  
• When I assign the parameter to an array then print out the array the string value is corrupted.
  
• I've been referencing PEP 393
  
• Performing the same activity in purely Python prints out the string argument and array fine.
  

I have tried using these C functions to create the PyUnicode string and they all behave the same way.

Output:
// C code to create a PyUnicode string and set it into a tuple
void SetParameter(PyObject * pTuple, const char * psValue, unsigned int uPosition) {
  // PyObject * obj = PyUnicode_FromStringAndSize(psValue, strlen(psValue));
  // PyObject * obj = _PyUnicode_FromASCII(psValue, strlen(psValue));
  // PyObject * obj = PyUnicode_FromFormat("%s", psValue);
  PyObject * obj = PyUnicode_FromKindAndData(PyUnicode_1BYTE_KIND, psValue, strlen(psValue));
  PyTuple_SetItem(pTuple, uPosition, obj);
}

# Python 3 function receiving the tuple with a strings
def configure(self, ip1, ip2, ip3):
    print ("configure[ip list]", ip1, ip2, ip3)
    self.string_args.append('--ip')
    self.string_args.append(ip1)
    self.string_args.append('--ip')
    self.string_args.append(ip2)
    self.string_args.append('--ip')
    self.string_args.append(ip3)
    print ("configure[self.string_args]", self.string_args)

Output:
# Printed output when configure() is executed from C
configure[ip list] 127.0.0.1 127.0.0.1 127.0.0.1
configure [self.string_args] ['--ip', ''27.0.0.1', '--ip', "\"\\\"\\\\\\, '--ip', '"\\"\\\\\\"\\\\\\\\\\\\', '--ip', '"\\"\\\\\\"\\\\\\\\\\\\']

Output:
# Printed output when configure() is executed from Python
$ ./Test.py
configure [ip list] 127.0.0.1 127.0.0.2 127.0.0.3
configure [self.string_args] ['--ip', '127.0.0.1', '--ip', '127.0.0.2', '--ip', '127.0.0.3']

Due to the difference in behavior I conclude that it is something about the way the C code creates the PyUnicode objects. Perhaps I need to create some other object type?

I have the source for the C Python engine but I haven't figure it out yet.