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How to activate virtualenv?
... creating a folder and cd'ing into it:
$ virtualenv venv --distribute
New python executable in venv/bin/python
Installing distribute.........done.
Installing pip................done.
$ source venv/bin/activate
(venv)$ python
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Count how many records are in a CSV Python?
I'm using python (Django Framework) to read a CSV file. I pull just 2 lines out of this CSV as you can see. What I have been trying to do is store in a variable the total number of rows the CSV also.
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Calling a function of a module by using its name (a string)
...o go about calling a function given a string with the function's name in a Python program. For example, let's say that I have a module foo , and I have a string whose content is "bar" . What is the best way to call foo.bar() ?
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Python: using a recursive algorithm as a generator
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In Python 3.4, you can replace the last two lines with yield from getPermutations(string[:i] + string[i+1:]), which is more efficient in many ways!
– Manuel Ebert
Apr 29 '14 at 17:46
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How to join components of a path when you are constructing a URL in Python
...th a slash which signifies that it already begins at the website root.
On Python 2, you have to do
from urlparse import urljoin
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Determining Whether a Directory is Writeable
What would be the best way in Python to determine whether a directory is writeable for the user executing the script? Since this will likely involve using the os module I should mention I'm running it under a *nix environment.
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Scripting Language vs Programming Language [closed]
...ed and/or recompiled at runtime)
Pascal
...and then you have things like Python that sit in both camps: Python is widely used without a compilation step, but the main implementation (CPython) does that by compiling to bytecode on-the-fly and then running the bytecode in a VM, and it can write that...
“for line in…” results in UnicodeDecodeError: 'utf-8' codec can't decode byte
...c can't decode byte 0xd0 in position 32: invalid continuation byte. I used python 3.6.5 to install aws cli. And when I tried aws --version it failed with this error. So I had to edit /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/configparser.py and changed the code to the following...
What is the best way to exit a function (which has no return value) in python before the function en
...ng a return statement. Returning nothing is the same as returning None in Python.
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Serializing class instance to JSON
...t of object types by default, all built-in types. List here: https://docs.python.org/3.3/library/json.html#encoders-and-decoders
One good solution would be to make your class inherit from JSONEncoder and then implement the JSONEncoder.default() function, and make that function emit the correct JSO...