Not able to import pandas and numpy

I am trying to run following simple script on Debian Stable Linux:

$ cat ./mytest.py 
#! /usr/bin/python3

print("Before importing sys.")
import sys

print("Before importing pandas.")
import pandas as pd

print("Before importing numpy.")
import numpy as np

But it is giving following error:

$ ./mytest.py 
Before importing sys.
Before importing pandas.
time.struct_time(tm_year=2017, tm_mon=11, tm_mday=22, tm_hour=22, tm_min=43, tm_sec=50, tm_wday=2, tm_yday=326, tm_isdst=0)
Date=22
Month=11
Year=2017
Hour=22
Minute=43
Second=50
Local current time : Wed Nov 22 22:43:50 2017
Traceback (most recent call last):
  File "./mytest.py", line 7, in <module>
    import pandas as pd
  File "/usr/lib/python3/dist-packages/pandas/__init__.py", line 13, in <module>
    __import__(dependency)
  File "/home/iuser/.local/lib/python3.5/site-packages/numpy/__init__.py", line 142, in <module>
    from . import add_newdocs
  File "/home/iuser/.local/lib/python3.5/site-packages/numpy/add_newdocs.py", line 13, in <module>
    from numpy.lib import add_newdoc
  File "/home/iuser/.local/lib/python3.5/site-packages/numpy/lib/__init__.py", line 8, in <module>
    from .type_check import *
  File "/home/iuser/.local/lib/python3.5/site-packages/numpy/lib/type_check.py", line 11, in <module>
    import numpy.core.numeric as _nx
  File "/home/iuser/.local/lib/python3.5/site-packages/numpy/core/__init__.py", line 16, in <module>
    from . import multiarray
SystemError: initialization of multiarray raised unreported exception

Following versions of pandas and numpy are installed through Debian Repositories:

Package                 Installed       Previous        Now             State
=======================-===============-===============-===============-=====
python3-pandas          0.19.2-5.1      0.19.2-5.1      0.19.2-5.1      install
python3-pandas-lib      0.19.2-5.1      0.19.2-5.1      0.19.2-5.1      install

python-numpy            1:1.12.1-3      1:1.12.1-3      1:1.12.1-3      install
python3-numpy           1:1.12.1-3      1:1.12.1-3      1:1.12.1-3      install

Where is the problem and how can it be solved?

---

Edit: I find that the same above file works perfectly in another folder! I am using correct filename for command.

$ ./mytest.py 
Before importing sys.
Before importing pandas.
Before importing numpy.

There are other files and sub-folders in first folder. One of which is __pycache__ which contains following files:

$ ls
datetime.cpython-35.pyc  myfns.cpython-35.pyc  myframe.cpython-35.pyc

My datetime.py file has following:

import time

tt = time.localtime()
print(tt)
print("Date="+str(tt.tm_mday))
print("Month="+str(tt.tm_mon))
print("Year="+str(tt.tm_year))
print("Hour="+str(tt.tm_hour))
print("Minute="+str(tt.tm_min))
print("Second="+str(tt.tm_sec))

localtime = time.asctime( time.localtime() )   # <<<<<<<<<<<<<<<<<< same as complex above; 
print ("Local current time :", localtime)

Is it possible these are interfering?

Answer

Since the script was working well in other folders, the problem was in this folder only. There was a file named datetime.py in this folder, removal of which resolved the problem. Apparently, pandas looks for a file named datetime.py and searches first the current folder, where it finds this user file with same name. Hence the problem.

Moral of the story: User files should not be given general names that may be being used by software packages.