Trouble importing modules into ipython - python-3.x

Question

On a freshly installed Windows 10 machine, I installed the newest 64bit version of anaconda. Now when I try importing modules into ipython, I get errors. Some sample errors are reproduced below.
I am new to Python and Programming, so would appreciate a bit of help. This is a brand new Lenovo laptop, so there's no scope for any Python version conflict etc. (since nothing was installed on it earlier).
In [1]: import sklearn
---------------------------------------------------------------------------
ImportError Traceback (most recent call last)
<ipython-input-1-b7c74cbf5af0> in <module>
----> 1 import sklearn
C:\Software\anaconda3\lib\site-packages\sklearn\__init__.py in <module>
74 else:
75 from . import __check_build
---> 76 from .base import clone
77 from .utils._show_versions import show_versions
78
C:\Software\anaconda3\lib\site-packages\sklearn\base.py in <module>
11 import re
12
---> 13 import numpy as np
14
15 from . import __version__
C:\Software\anaconda3\lib\site-packages\numpy\__init__.py in <module>
138
139 # Allow distributors to run custom init code
--> 140 from . import _distributor_init
141
142 from . import core
C:\Software\anaconda3\lib\site-packages\numpy\_distributor_init.py in <module>
32
33 with RTLD_for_MKL():
---> 34 from . import _mklinit
35
36 del RTLD_for_MKL
ImportError: DLL load failed: The specified module could not be found.
In [2]: import matplotlib.pyplot as plt
---------------------------------------------------------------------------
ImportError Traceback (most recent call last)
<ipython-input-2-a0d2faabd9e9> in <module>
----> 1 import matplotlib.pyplot as plt
C:\Software\anaconda3\lib\site-packages\matplotlib\__init__.py in <module>
136 # cbook must import matplotlib only within function
137 # definitions, so it is safe to import from it here.
--> 138 from . import cbook, rcsetup
139 from matplotlib.cbook import (
140 MatplotlibDeprecationWarning, dedent, get_label, sanitize_sequence)
C:\Software\anaconda3\lib\site-packages\matplotlib\cbook\__init__.py in <module>
29 from weakref import WeakMethod
30
---> 31 import numpy as np
32
33 import matplotlib
C:\Software\anaconda3\lib\site-packages\numpy\__init__.py in <module>
138
139 # Allow distributors to run custom init code
--> 140 from . import _distributor_init
141
142 from . import core
C:\Software\anaconda3\lib\site-packages\numpy\_distributor_init.py in <module>
32
33 with RTLD_for_MKL():
---> 34 from . import _mklinit
35
36 del RTLD_for_MKL
ImportError: DLL load failed: The specified module could not be found.
In [3]: import pystan
---------------------------------------------------------------------------
ModuleNotFoundError Traceback (most recent call last)
<ipython-input-3-ca8618bb8e4a> in <module>
----> 1 import pystan
ModuleNotFoundError: No module named 'pystan'
In [4]:

Answer 1

After a lot of google searching, I found a few sites that touch upon some closely related issues (ex. https://github.com/stan-dev/pystan/issues/520). It so happens that one needs to add some anaconda directroties to the Windows path. I added anaconda/Library/bin, anaconda/Scripts to the path. Now everything is working as expected.