Object type <class 'str'> cannot be passed to C code - virtual environment : <p>I am using mac anaconda. And I try to use the AES of Crypto. However, I face a strange problem. </p>

<p>I just want to excute a simple line of code:</p>

<pre><code> obj = AES.new('This is a key123', AES.MODE_CBC, 'This is an IV456')
</code></pre>

<p>if I run the code without the virtual environment as below it is OK.</p>

<pre><code>$ python

Python 3.6.4 |Anaconda, Inc.| (default, Jan 16 2018, 12:04:33) 
[GCC 4.2.1 Compatible Clang 4.0.1 (tags/RELEASE_401/final)] on darwin
Type "help", "copyright", "credits" or "license" for more 
information.
&gt;&gt;&gt; from Crypto.Cipher import AES

&gt;&gt;&gt; obj = AES.new('This is a key123', AES.MODE_CBC, 'This is an IV456')
</code></pre>

<p>if I run with the virtual environment "testaes" then I got the error:</p>

<pre><code>(testaes)$ python
Python 3.6.4 |Anaconda, Inc.| (default, Mar 12 2018, 20:05:31) 
[GCC 4.2.1 Compatible Clang 4.0.1 (tags/RELEASE_401/final)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
&gt;&gt;&gt; from Crypto.Cipher import AES

&gt;&gt;&gt; obj = AES.new('This is a key123', AES.MODE_CBC, 'This is an IV456')
Traceback (most recent call last):
File "&lt;stdin&gt;", line 1, in &lt;module&gt;
File "/Applications/anaconda3/envs/testaes/lib/python3.6/site-packages/Crypto/Cipher/AES.py", line 200, in new
return _create_cipher(sys.modules[__name__], key, mode, *args, **kwargs)
File "/Applications/anaconda3/envs/testaes/lib/python3.6/site-packages/Crypto/Cipher/__init__.py", line 55, in _create_cipher
return modes[mode](factory, **kwargs)
File "/Applications/anaconda3/envs/testaes/lib/python3.6/site-packages/Crypto/Cipher/_mode_cbc.py", line 234, in _create_cbc_cipher
cipher_state = factory._create_base_cipher(kwargs)
File "/Applications/anaconda3/envs/testaes/lib/python3.6/site-packages/Crypto/Cipher/AES.py", line 100, in _create_base_cipher
result = start_operation(c_uint8_ptr(key),
File "/Applications/anaconda3/envs/testaes/lib/python3.6/site-packages/Crypto/Util/_raw_api.py", line 109, in c_uint8_ptr
raise TypeError("Object type %s cannot be passed to C code" % type(data))
TypeError: Object type &lt;class 'str'&gt; cannot be passed to C code
</code></pre>

<p>You can see that at both time I use the the same anaconda python 3.6.4 and GCC4.2.1.  How to solve this? thank you.</p>
