Import numpy throws error: SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated \uXXXX escape

Question

I have installed pyzo and miniconda under Windows 10 and installed numpy and matplotlib using conda install. But when I'm trying to run

import numpy as np 
import matplotlib.pyplot as plt 

I'm getting this error:

Traceback (most recent call last):
  File "<tmp 1>", line 3, in <module>
    import numpy
  File "c:\users\jakub\miniconda3\lib\site-packages\numpy\__init__.py", line 165, in <module>
    from numpy.__config__ import show as show_config
  File "c:\users\jakub\miniconda3\lib\site-packages\numpy\__config__.py", line 5
    lapack_mkl_info={'libraries': ['mkl_lapack95_lp64', 'mkl_core_dll', 'mkl_intel_lp64_dll', 'mkl_intel_thread_dll'], 'define_macros': [('SCIPY_MKL_H', None), ('HAVE_CBLAS', None)], 'include_dirs': ['c:\users\jakub\miniconda3\\Library\\include'], 'library_dirs': ['c:\users\jakub\miniconda3\\Library\\lib']}
                                                                                                                                                                                                       ^
SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated \uXXXX escape

I do not have any non-standard character either in my code nor in the directory structure...I have read many posts referring to similar problems with UTF-8 but this is different as it happens during the initial import.

Answer 1

When conda installs packages, it replaces the prefix, to make things relocatable. Unfortunately, it does not intelligently escape backslashes, so on Windows, these unescaped backslashes lead to the error you see.

In recent versions of conda, we use forward slashes in prefix replacement, and this issue goes away. If you can update conda, go do that. If not, numpy has prefixes in the following files:

"Lib/site-packages/numpy/distutils/site.cfg"
"Scripts/f2py.py"
"Lib/site-packages/numpy/config.py"
"Lib/site-packages/numpy/distutils/config.py"

check the latter 3 especially, and replace any non-escaped backslashes ( \ ) with either escaped ones ( \\ ) or forward slashes

Answer 2

So, for people having trouble in

import numpy

using Windows 10 + Anaconda:

I replaced all single '\' to double '\\' in

\Lib\site-packages\numpy\__config__.py

I could import numpy after that.