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What is the best way to compare floats for almost-equality in Python?
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Python 3.5 adds the math.isclose and cmath.isclose functions as described in PEP 485.
If you're using an earlier version of Python, the equivalent function is given in the documentation.
def isclose(a, b, rel_tol=1e-09, abs...
How to install lxml on Ubuntu
...elopment packages using apt-get.
apt-get install libxml2-dev libxslt1-dev python-dev
If you're happy with a possibly older version of lxml altogether though, you could try
apt-get install python-lxml
and be done with it. :)
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How to add property to a class dynamically?
... tree out of __getattribute__.
When I ask for foo.b in the example above, Python sees that the b defined on the class implements the descriptor protocol—which just means it's an object with a __get__, __set__, or __delete__ method. The descriptor claims responsibility for handling that attribute...
How do I check that multiple keys are in a dict in a single pass?
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if {"foo", "bar"} <= myDict.keys(): ...
If you're still on Python 2, you can do
if {"foo", "bar"} <= myDict.viewkeys(): ...
If you're still on a really old Python <= 2.6, you can call set on the dict, but it'll iterate over the whole dict to build the set, and that's slow:
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Python unit test with base and sub class
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@Hannes At least in python 3, BaseTest can be referenced through super(self.__class__, self) or just super() in the subclasses, although apparently not if you were to inherit constructors. Maybe there is also such an "anonymous" alternative when...
Multiple levels of 'collection.defaultdict' in Python
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This is awesome. It seems I renew my marital vows to Python daily.
– mVChr
Nov 3 '14 at 22:32
3
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using facebook sdk in Android studio
... the facebook directory. If you like,
delete the project.properties, build.xml, .classpath, and .project. files as well. You don't need them.
Create a build.gradle file in the facebook directory with the
following contents:
buildscript {
repositories {
mavenCentral()
}
dependenc...
How Pony (ORM) does its tricks?
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Pony ORM author is here.
Pony translates Python generator into SQL query in three steps:
Decompiling of generator bytecode and rebuilding generator AST
(abstract syntax tree)
Translation of Python AST into "abstract SQL" -- universal
list-based representation of a...
Generate 'n' unique random numbers within a range [duplicate]
I know how to generate a random number within a range in Python.
4 Answers
4
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Python list iterator behavior and next(iterator)
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Something is wrong with your Python/Computer.
a = iter(list(range(10)))
for i in a:
print(i)
next(a)
>>>
0
2
4
6
8
Works like expected.
Tested in Python 2.7 and in Python 3+ . Works properly in both
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