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How to assign the output of a command to a Makefile variable
I need to execute some make rules conditionally, only if the Python installed is greater than a certain version (say 2.5).
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How exactly does the callstack work?
...led and found the paper here: cslibrary.stanford.edu/102/PointersAndMemory.pdf Really helpful paper!
– Christoph
Jun 1 '14 at 18:02
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转：postfix安装Q&A - 更多技术 - 清泛网 - 专注C/C++及内核技术
...tmail.org/forum/archive/2/0510/563.html）。现在把我安装过程中遇到的问题及解决方法提供给大家，以方便新手。高手就不要看了
说明一下：Q代表安装过程中遇到的问题，或者是日志中出现的现象。A：代表解决方法。
在这里要...
Allowed characters in Linux environment variable names
...ME COMMAND
1 root 0:00 /bin/sh
12 root 0:00 ps aux
Use python to verify environemnt variable
apk add python
python -c 'import os; print(os.environ["spring.application_name"])'
OUTPUT is happy-variable-name.
What happen?
Shell call builtin exec
Shell builtin exec call syscal...
How do I access the command history from IDLE?
...dentally, why don't you try a better (less ugly, for starters) shell like bpython or ipython?
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nosetests is capturing the output of my print statements. How to circumvent this?
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python3.5 -m "nose" --nocapture
– Alex Punnen
Mar 19 '18 at 9:24
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How to allocate aligned memory only using the standard library?
... part of the C11 specification: open-std.org/jtc1/sc22/wg14/www/docs/n1516.pdf (page 346)
– skagedal
Sep 5 '13 at 22:15
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Sort a list by multiple attributes?
...Or you can achieve the same using itemgetter (which is faster and avoids a Python function call):
import operator
s = sorted(s, key = operator.itemgetter(1, 2))
And notice that here you can use sort instead of using sorted and then reassigning:
s.sort(key = operator.itemgetter(1, 2))
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Remove the first character of a string
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python 2.x
s = ":dfa:sif:e"
print s[1:]
python 3.x
s = ":dfa:sif:e"
print(s[1:])
both prints
dfa:sif:e
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sqlite3.ProgrammingError: Incorrect number of bindings supplied. The current statement uses 1, and t
... treated as the input sequence. If that string is 74 characters long, then Python sees that as 74 separate bind values, each one character long.
>>> len(img)
74
>>> len((img,))
1
If you find it easier to read, you can also use a list literal:
cursor.execute('INSERT INTO images ...