How to know/change current directory in Python shell?
I am using Python 3.2 on Windows 7. When I open the Python shell, how can I know what the current directory is and how can I change it to another directory where my modules are?
Python
How to run Pip commands from CMD
As I understand, Python 2.7.9 comes with Pip installed, however when I try to execute a Pip command from CMD (Windows) I get the following error:
Python while loop conversion to Javascript
How would I convert the following: while True: # do something time.sleep(2) into JavaScript? Answers: Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment … Read more
Does Conda replace the need for virtualenv?
I recently discovered Conda after I was having trouble installing SciPy, specifically on a Heroku app that I am developing.
Find the longest common starting substring in a set of strings
i for i in range(min(map(len, a))), number of maximum lookups can’t be greater than the length of the shortest string; in this example this would evaluate to [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Install PyQt5 5.14.1 on Linux
pip3 install PyQt5 Collecting PyQt5 Using cached https://files.pythonhosted.org/packages/3a/fb/eb51731f2dc7c22d8e1a63ba88fb702727b324c6352183a32f27f73b8116/PyQt5-5.14.1.tar.gz Complete output from command python setup.py egg_info: Traceback (most recent call last): File "<string>", line 1, in <module> File "/usr/lib/python3.6/tokenize.py", line 452, in open buffer = _builtin_open(filename, 'rb') FileNotFoundError: [Errno 2] No such file or directory: '/tmp/pip-build-b2zw891b/PyQt5/setup.py' —————————————- Command "python setup.py egg_info" failed with error code 1 … Read more
How should I use the Optional type hint?
I’m trying to understand how to use the Optional type hint. From PEP-484, I know I can use Optional for def test(a: int = None) either as def test(a: Union[int, None]) or def test(a: Optional[int]).
How can I check for Python version in a program that uses new language features?
If I have a Python script that requires at least a particular
version of Python, what is the correct way to fail gracefully
when an earlier version of Python is used to launch the script?
How should I read a file line-by-line in Python?
In pre-historic times (Python 1.4) we did: