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Boost程序库完全开发指南——深入C++“准”标准库高清PDF版 - 文档下载 - ...
Boost程序库完全开发指南——深入C++“准”标准库高清PDF版C++ Boost 标准库Boost是一个功能强大、构造精巧、跨平台、开源并且完全免费的C++程序库，有着C++‘准’标准库的美誉。它由C++标准委员会部分成员...Boost是一个功能...
How to beautify JSON in Python?
... here, it also includes a line using json.dumps() Using it with aiohttp on python3.7, didn't need to use the sys module and unicode(String, encoding). Basically it becomes == highlight(formatted_json, lexers.JsonLexer(), formatters.TerminalFormatter())
– DanglingPointer
...
Determine if Python is running inside virtualenv
...he following invocation:
$ python2 test.py
outside virtualenv or venv
$ python3 test.py
outside virtualenv or venv
$ python2 -m virtualenv virtualenv2
...
$ . virtualenv2/bin/activate
(virtualenv2) $ python test.py
inside virtualenv or venv
(virtualenv2) $ deactivate
$ python3 -m virtualenv v...
Why use Abstract Base Classes in Python?
...elf):
pass
@abstractmethod
def bar(self):
pass
# python3
class Base(object, metaclass=ABCMeta):
@abstractmethod
def foo(self):
pass
@abstractmethod
def bar(self):
pass
class Concrete(Base):
def foo(self):
pass
# We forget t...
Remove characters except digits from string using Python?
...also emits '1233344554552'. However, putting this in xx.py we have...:
$ python3.1 -mtimeit -s'import re; x="aaa12333bb445bb54b5b52"' 're.sub(r"\D", "", x)'
100000 loops, best of 3: 8.43 usec per loop
$ python3.1 -mtimeit -s'import xx; x="aaa12333bb445bb54b5b52"' 'x.translate(xx.DD)'
10000 loops,...
How to keep keys/values in same order as declared?
...
Python3.7 now has dict ordered by default. mail.python.org/pipermail/python-dev/2017-December/151283.html
– sertsedat
Sep 4 '18 at 8:05
...
Convert a Python list with strings all to lowercase or uppercase
... The map function works as expected in python2, however in python3 you to wrap the map in a list ex: list(map(lambda x:x.upper(),["a","b","c"]))
– Tom S
Aug 5 '17 at 14:09
...
What does %s mean in a python format string?
...:
#Python2
name = raw_input("who are you? ")
print "hello %s" % (name,)
#Python3+
name = input("who are you? ")
print("hello %s" % (name,))
The %s token allows me to insert (and potentially format) a string. Notice that the %s token is replaced by whatever I pass to the string after the % symbo...
No module named _sqlite3
...tar.gz and run ./configure,make && make install. After I recompile python3 it's still not working.
– AntiMoron
Jan 26 '16 at 2:27
2
...
Validating with an XML schema in Python
...
An example of a simple validator in Python3 using the popular library lxml
Installation lxml
pip install lxml
If you get an error like "Could not find function xmlCheckVersion in library libxml2. Is libxml2 installed?", try to do this first:
# Debian/Ubunt...