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multiprocessing.Pool: When to use apply, apply_async or map?
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Back in the old days of Python, to call a function with arbitrary arguments, you would use apply:
apply(f,args,kwargs)
apply still exists in Python2.7 though not in Python3, and is generally not used anymore. Nowadays,
f(*args,**kwargs)
is pr...
Return type of '?:' (ternary conditional operator)
...ed Dec 16 '11 at 14:00
Filip Roséen - refpFilip Roséen - refp
55.8k1818 gold badges135135 silver badges184184 bronze badges
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Understanding Fragment's setRetainInstance(boolean)
...ed Mar 28 at 21:35
Gastón SaillénGastón Saillén
7,72144 gold badges3030 silver badges4848 bronze badges
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Different ways of clearing lists
...e complicated than one of these two lines when you want to clear a list in Python?
8 Answers
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What's the best way of scraping data from a website? [closed]
...ited for this task and the library/framework support is poor in this area. Python (Scrapy is a great starting point) and Clojure/Clojurescript (incredibly powerful and productive but a big learning curve) are great languages for this problem. Since you would rather not learn a new language and you a...
How to sort a list/tuple of lists/tuples by the element at a given index?
... @Cemre as for the second example, sort here is a method of List object of Python, which receives a lambda function as its key parameter. You may name it as tup, or t, or whatever you like and it'll still work. tup here specifies index of the list's tuple, so 1 means that sorting will be performed b...
Python Regex instantly replace groups
...re.sub:
result = re.sub(r"(\d.*?)\s(\d.*?)", r"\1 \2", string1)
This is Python's regex substitution (replace) function. The replacement string can be filled with so-called backreferences (backslash, group number) which are replaced with what was matched by the groups. Groups are counted the same ...
Splitting on last delimiter in Python string?
What's the recommended Python idiom for splitting a string on the last occurrence of the delimiter in the string? example:
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How can I extract the folder path from file path in Python?
...hould consider using pathlib for new development. It is in the stdlib for Python3.4, but available on PyPI for earlier versions. This library provides a more object-orented method to manipulate paths <opinion> and is much easier read and program with </opinion>.
>>> import pa...
Ubuntu running `pip install` gives error 'The following required packages can not be built: * freety
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Why not directly use sudo apt-get install python-matplotlib as recommended here: matplotlib.org/users/installing.html
– Timo
Nov 8 '14 at 21:16
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