In Python, is there an analogue of the C preprocessor statement such as?:
#define MY_CONSTANT 50
Also, I have a large list of constants I’d like to import to several classes. Is there an analogue of declaring the constants as a long sequence of statements like the above in a .py file and importing it to another .py file?
Edit.
The file Constants.p….
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open() gives FileNotFoundError/IOError: Errno 2 No such file or directory
(8 answers)
Closed 2 days ago.
Say I have a python project that is structured as follows:
project
/data
….
In Python, once I have imported a module X in an interpreter session using import X, and the module changes on the outside, I can reload the module with reload(X). The changes then become available in my interpreter session.
I am wondering if this also possible when I import a component Y from module X using from X import Y.
The statement reload Y….
I can’t seem to get the nose testing framework to recognize modules beneath my test script in the file structure. I’ve set up the simplest example that demonstrates the problem. I’ll explain it below.
Here’s the the package file structure:
./__init__.py
./foo.py
./tests
./__init__.py
./test_foo.py
foo.py contains:
def dumb_true():
retu….
Is there a straightforward way to find all the modules that are part of a python package? I’ve found this old discussion, which is not really conclusive, but I’d love to have a definite answer before I roll out my own solution based on os.listdir().
….
I have a foo.py
def foo():
print “test”
In IPython I use:
In [6]: import foo
In [7]: foo.foo()
test
Then I changed the foo() to:
def foo():
print “test changed”
In IPython, the result for invoking is still test:
In [10]: import foo
In [11]: foo.foo()
test
Then I use:
In [15]: del foo
In [16]: import foo
In [17]: foo.foo()
test
I….
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Relative imports in Python 3
(31 answers)
Closed last month.
from ..box_utils import decode, nms
This line is giving error
ImportError: attempted relative import with no known parent….
How do I check if I imported a module somewhere in the code?
if not has_imported(“somemodule”):
print(‘you have not imported somemodule’)
The reason that I would like to check if I already imported a module is because I have a module that I don’t want to import, because sometimes it messes up my program.
….
I have a directory full of scripts (let’s say project/bin). I also have a library located in project/lib and want the scripts to automatically load it. This is what I normally use at the top of each script:
#!/usr/bin/python
from os.path import dirname, realpath, sep, pardir
import sys
sys.path.append(dirname(realpath(__file__)) + sep + pardir + s….
When trying to import OpenCV, using import cv2 I get the following error:
/usr/local/lib/python2.7/dist-packages/cv2/__init__.py in
7
8 # make IDE’s (PyCharm) autocompletion happy
—-> 9 from .cv2 import *
10
11 # wildcard import above does not import “private” variables like __version__
ImportError: libSM.so.6….