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Python dictionary: Get list of values for list of keys
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A little speed comparison:
Python 2.7.11 |Anaconda 2.4.1 (64-bit)| (default, Dec 7 2015, 14:10:42) [MSC v.1500 64 bit (AMD64)] on win32
In[1]: l = [0,1,2,3,2,3,1,2,0]
In[2]: m = {0:10, 1:11, 2:12, 3:13}
In[3]: %timeit [m[_] for _ in l] # list comprehension
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Check if a given key already exists in a dictionary
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Wanted to share that (using Python 2.7) the run time of something I just wrote, basing heavily on dicts, was 363.235070 using "key in dict.keys()" and drastically went down to 0.260186 solely by removing the call for "keys()"
– Ido_f
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“Cross origin requests are only supported for HTTP.” error when loading a local file
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In response to LukeP's comment, in python 2.7 the command does work as per the instructions $ python -m SimpleHTTPServer, which produces the message: Serving HTTP on 0.0.0.0 port 8000 ... If you spell the module name wrong, e.g. $ python -m SimpleHttpServer then you ...
About catching ANY exception
...://docs.python.org/3.5/library/exceptions.html#exception-hierarchy
Python 2.7:
https://docs.python.org/2.7/library/exceptions.html#exception-hierarchy
try:
something()
except BaseException as error:
print('An exception occurred: {}'.format(error))
But as other people mentioned, you would...
Find all controls in WPF Window by type
... what do you mean "root element" ? What should I write to connect with my mainwindow form?
– deadfish
Dec 30 '11 at 16:02
1
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How can I make a Python script standalone executable to run without ANY dependency?
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Nuitka works on Python 2.6, 2.7, 3.2, 3.3, and 3.4, and is cross-platform:(Linux, FreeBSD, NetBSD, MacOS X, and Windows (32/64 bits). Others may work as well. Architectures: x86, x86_64 (amd64), and arm. Other architectures may also work, out of the b...
Max retries exceeded with URL in requests
...a resolver lookup issue, as indicated by the (Caused by <class 'socket.gaierror'>: [Errno -2] Name or service not known) part. "gai" stands for getaddrinfo, and the probable related error is: EAI_NONAME The node or service is not known; or both node and service are NULL; or AI_NUMERICSERV wa...
Is there a difference between using a dict literal and a dict constructor?
...D_MAP and STORE_MAP opcodes rather than generic CALL_FUNCTION:
> python2.7 -m timeit "d = dict(a=1, b=2, c=3, d=4, e=5)"
1000000 loops, best of 3: 0.958 usec per loop
> python2.7 -m timeit "d = {'a':1, 'b':2, 'c':3, 'd':4, 'e':5}"
1000000 loops, best of 3: 0.479 usec per loop
> python3.2...
How do I make python wait for a pressed key?
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I'm getting this error when I try to do this in Python 2.7: "SyntaxError: unexpected EOF while parsing"
– Jon Tirsen
Sep 17 '14 at 7:11
8
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