Can't import urllib.request module in python 3 - python-3.x

Question

I was executing a code from the book Think Python in Python 3. The code follows.
#!/usr/bin/env python3
# -*- encoding: utf-8 -*-
import urllib.request
conn = urllib.request.urlopen('http://thinkpython.com/secret.html')
for line in conn:
print(line.strip())
When I execute this code in my machine's terminal, I got this following output.
Traceback (most recent call last):
File "secret.py", line 4, in <module>
import urllib.request
File "/usr/lib/python3.6/urllib/request.py", line 84, in <module>
import base64
File "/usr/lib/python3.6/base64.py", line 10, in <module>
import struct
File "/usr/lib/python3.6/struct.py", line 13, in <module>
from _struct import *
ModuleNotFoundError: No module named '_struct'
Error in sys.excepthook:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 63, in apport_excepthook
from apport.fileutils import likely_packaged, get_recent_crashes
File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5, in <module>
from apport.report import Report
File "/usr/lib/python3/dist-packages/apport/report.py", line 12, in <module>
import subprocess, tempfile, os.path, re, pwd, grp, os, time
File "/usr/lib/python3.6/subprocess.py", line 136, in <module>
import _posixsubprocess
ModuleNotFoundError: No module named '_posixsubprocess'
Original exception was:
Traceback (most recent call last):
File "secret.py", line 4, in <module>
import urllib.request
File "/usr/lib/python3.6/urllib/request.py", line 84, in <module>
import base64
File "/usr/lib/python3.6/base64.py", line 10, in <module>
import struct
File "/usr/lib/python3.6/struct.py", line 13, in <module>
from _struct import *
ModuleNotFoundError: No module named '_struct'
I did this same code in Anaconda, and I got the correct output. Can anybody help me with this problem.