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How would you make a comma-separated string from a list of strings?
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Note if you are using python 2.7 (which you shouldn't by now) then using str will raise an exception if any item in the list has unicode.
– kroiz
May 26 at 13:54
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Easy pretty printing of floats in python?
...'d add something potentially useful:
I know you wrote your example in raw Python lists, but if you decide to use numpy arrays instead (which would be perfectly legit in your example, because you seem to be dealing with arrays of numbers), there is (almost exactly) this command you said you made up:...
How do you search for files containing DOS line endings (CRLF) with grep on Linux?
...rogram. This is very fragile. For (just one) example: it doesn't work with XML files, file reports XML document text regardless of newlines type.
– leonbloy
Nov 28 '13 at 17:59
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How do I merge a list of dicts into a single dict?
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>>> result
{'a':1,'c':1,'b':2,'d':2}
As a comprehension:
# Python >= 2.7
{k: v for d in L for k, v in d.items()}
# Python < 2.7
dict(pair for d in L for pair in d.items())
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Exit codes in Python
...ou can check the special variable $? for the last exit status:
me@mini:~$ python -c ""; echo $?
0
me@mini:~$ python -c "import sys; sys.exit(0)"; echo $?
0
me@mini:~$ python -c "import sys; sys.exit(43)"; echo $?
43
Personally I try to use the exit codes I find in /usr/include/asm-generic/errno.h...
Using Python's os.path, how do I go up one directory?
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@OriolNieto Yes, as of version Python 3.4+ you can use pathlib.Path.parents[levels_up-1]. See this question for more solutions
– jwalton
Apr 4 '19 at 15:22
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How can I analyze Python code to identify problematic areas?
... the docs, I don't think you can use the command line. You have to use the Python API.
– Dave Halter
Apr 8 '15 at 9:37
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Print a list in reverse order with range()?
How can you produce the following list with range() in Python?
19 Answers
19
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Understanding generators in Python
I am reading the Python cookbook at the moment and am currently looking at generators. I'm finding it hard to get my head round.
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In Python, how do I iterate over a dictionary in sorted key order?
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Haven't tested this very extensively, but works in Python 2.5.2.
>>> d = {"x":2, "h":15, "a":2222}
>>> it = iter(sorted(d.iteritems()))
>>> it.next()
('a', 2222)
>>> it.next()
('h', 15)
>>> it.next()
('x', 2)
>>>
If you...