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Should I put #! (shebang) in Python scripts, and what form should it take?
...se IS important.
Correct usage for Python 3 scripts is:
#!/usr/bin/env python3
This defaults to version 3.latest. For Python 2.7.latest use python2 in place of python3.
The following should NOT be used (except for the rare case that you are writing code which is compatible with both Python 2....
Can anyone explain python's relative imports?
...
Checking it out in python3:
python -V
Python 3.6.5
Example1:
.
├── parent.py
├── start.py
└── sub
└── relative.py
- start.py
import sub.relative
- parent.py
print('Hello from parent.py')
- sub/relative.py
from...
ImportError: No module named Crypto.Cipher
... Same for me in Windows+Vagrant with Ubuntu 14.04 64-bit and Python3
– Juha Untinen
Sep 13 '17 at 12:24
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How to delete items from a dictionary while iterating over it?
...
EDIT:
This answer will not work for Python3 and will give a RuntimeError.
RuntimeError: dictionary changed size during iteration.
This happens because mydict.keys() returns an iterator not a list.
As pointed out in comments simply convert mydict.keys() to...
How do I find the location of my Python site-packages directory?
...correctly, though. In Python 3, you may use the sysconfig module instead:
python3 -c 'import sysconfig; print(sysconfig.get_paths()["purelib"])'
The per user site-packages directory (PEP 370) is where Python installs your local packages:
python -m site --user-site
If this points to a non-existi...
How to execute a file within the python interpreter?
...es )
>>> print variables # globals from the someFile module
For Python3, use:
>>> exec(open("filename.py").read())
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Saving utf-8 texts in json.dumps as UTF8, not as \u escape sequence
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error in Python3 :AttributeError: 'str' object has no attribute 'decode'
– Gank
Apr 18 '16 at 13:59
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Install a module using pip for specific python version
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BEST Solution to all Python2 and Python3 problems!
– Harsh Vardhan Ladha
Dec 2 '15 at 13:49
9
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pip installing in global site-packages instead of virtualenv
...es folder instead of the one in the virtualenv folder. Here's how I set up Python3 and virtualenv on OS X Mavericks (10.9.1):
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Remove all special characters, punctuation and spaces from string
...e !,#$% etcs.')
Out[20]: 'stringwithspecialcharslikeetcs'
Python 3.*
In Python3, filter( ) function would return an itertable object (instead of string unlike in above). One has to join back to get a string from itertable:
''.join(filter(str.isalnum, string))
or to pass list in join use (not ...