ImportError: No module named requests in 'pytest'

Question

root
| +-- demo
      |-->__init__.py
      |-->conftest.py
      |-->test.py

conftest.py

import pytest
def tear_down():
    print "\nTEARDOWN after all tests"

@pytest.fixture(autouse=True)
def set_up(request):
    print "\nSETUP before all tests"
    if request.cls.__name__ == 'TestClassA':
        return ["username", "password"]
    request.addfinalizer(tear_down)

test.py

#import requests # this is commented

class TestClassA:
    def test_1(self,set_up):
        print "test A1 called"
        print("username :-- %s and password is %s" % (set_up[0], set_up[1]))
    def test_2(self):
        print "test A2 called"

class TestClassB:
    def test_1(self):
        print "test B1 called"

pytest -s -v demo/test.py::TestClassA

This code works fine. observe the first line of test.py , it's commented. Now, if I run the same script with uncommenting import requests , getting below error

ImportError while importing test module 'some_path/../demo/test.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/usr/local/lib/python2.7/site-packages/six-1.11.0-py2.7.egg/six.py:709: in exec_
    exec("""exec _code_ in _globs_, _locs_""")
demo/test.py:1: in <module>
    import requests
E   ImportError: No module named requests

Executing without pytest, works fine (no import error) And also, if test.py calls the function of other module ( which has import requests ) throws same error. Is it conflict of request of pytest ? I really don't understand this, can you please help me ?

which python : /Library/Frameworks/Python.framework/Versions/2.7/bin/python pytest --version : 'imported from /usr/local/lib/python2.7/site-packages/pytest-3.8.2-py2.7.egg/pytest.pyc' , is this a reason for failure ?

pytest --version

This is pytest version 3.8.2, imported from /usr/local/lib/python2.7/site-packages/pytest-3.8.2-py2.7.egg/pytest.pyc
setuptools registered plugins:
  celery-4.0.2 at /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/celery/contrib/pytest.py
  hypothesis-3.8.2 at /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/hypothesis/extra/pytestplugin.pyc
  pytest-cov-2.4.0 at /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pytest_cov/plugin.py

Answer 1

Add the following lines of code to your script and run it :

from distutils.sysconfig import get_python_lib
print(get_python_lib())

Now check the output, you will get some path printed which points to the exact location of the packages the python interpreter is currently using

e.g. "/usr/lib/python2.7/dist-packages"

cd(change directory) to the above path and ls(list directory) to check if package exists ; if not :

sudo pip3 install requests -t . # dot indicates current directory 

or else if you have a requirements.txt file then you could try:

sudo pip3 install -r requirements.txt -t "/usr/lib/python2.7/dist-packages" 
#try this from the directory where  "requirements.txt" file exists

Now run your scripts and please let me know if it worked