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How do I create a dictionary with keys from a list and values defaulting to (say) zero? [duplicate]
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dict((el,0) for el in a) will work well.
Python 2.7 and above also support dict comprehensions. That syntax is {el:0 for el in a}.
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Why is there no GIL in the Java Virtual Machine? Why does Python need one so bad?
...threads nicely without the need for a Global Interpreter Lock (GIL), while Python necessitates such an evil.
5 Answers
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Python Script execute commands in Terminal
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Thanks for that answer mate. Will be using python for my first application on Ubuntu desktop, this will really help me.
– LinuxBill
Jan 16 '13 at 10:55
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What is Ruby equivalent of Python's `s= “hello, %s. Where is %s?” % (“John”,“Mary”)`
In Python, this idiom for string formatting is quite common
4 Answers
4
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How to increment datetime by custom months in python without using library [duplicate]
...ng months=1 will add one month to original date.
Note: this will requires python-dateutil. To install it you need to run in Linux terminal.
sudo apt-get update && sudo apt-get install python-dateutil
Explanation : Add month value in python
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UnicodeDecodeError: 'utf8' codec can't decode byte 0x9c
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http://docs.python.org/howto/unicode.html#the-unicode-type
str = unicode(str, errors='replace')
or
str = unicode(str, errors='ignore')
Note: This will strip out (ignore) the characters in question returning the string without them....
How to validate a url in Python? (Malformed or not)
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A True or False version, based on @DMfll answer:
try:
# python2
from urlparse import urlparse
except:
# python3
from urllib.parse import urlparse
a = 'http://www.cwi.nl:80/%7Eguido/Python.html'
b = '/data/Python.html'
c = 532
d = u'dkakasdkjdjakdjadjfalskdjfalk'
def ...
Releasing memory in Python
...ted on the heap can be subject to high-water marks. This is complicated by Python's internal optimizations for allocating small objects (PyObject_Malloc) in 4 KiB pools, classed for allocation sizes at multiples of 8 bytes -- up to 256 bytes (512 bytes in 3.3). The pools themselves are in 256 KiB ar...
Problems with pip install numpy - RuntimeError: Broken toolchain: cannot link a simple C program
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For Docker (Alpine) and Python 3.x this worked for me:
RUN apk update
RUN apk add make automake gcc g++ subversion python3-dev
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Reducing Django Memory Usage. Low hanging fruit?
...Make sure you are not keeping global references to data. That prevents the python garbage collector from releasing the memory.
Don't use mod_python. It loads an interpreter inside apache. If you need to use apache, use mod_wsgi instead. It is not tricky to switch. It is very easy. mod_wsgi is way e...