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How do I merge a list of dicts into a single dict?
...gt; 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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Cannot find module cv2 when using OpenCV
...hese lines in the code:
import sys
sys.path.append('/usr/local/lib/python2.7/site-packages')
or before running the python command in bash move to /usr/local/lib/python2.7/site-packages directory. This is a work around if you don't want to add any thing to the code.
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Strip spaces/tabs/newlines - python
I am trying to remove all spaces/tabs/newlines in python 2.7 on Linux.
7 Answers
7
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Parse a .py file, read the AST, modify it, then write back the modified source code
...e tree structure and is very helpful in debugging. For example,
On Python 2.7:
>>> import ast
>>> tree = ast.parse("print 'Hello Python!!'")
>>> ast.dump(tree)
"Module(body=[Print(dest=None, values=[Str(s='Hello Python!!')], nl=True)])"
On Python 3.5:
>>> imp...
Why is there no xrange function in Python3?
... using timeit instead of trying to do it manually with time.
First, Apple 2.7.2 64-bit:
In [37]: %timeit collections.deque((x for x in xrange(10000000) if x%4 == 0), maxlen=0)
1 loops, best of 3: 1.05 s per loop
Now, python.org 3.3.0 64-bit:
In [83]: %timeit collections.deque((x for x in range(...
How to create a string with format?
...tring required!
String(format: "Value: %3.2f\tResult: %3.2f", arguments: [2.7, 99.8])
or
String(format:"Value: %3.2f\tResult: %3.2f", 2.7, 99.8)
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How can I print literal curly-brace characters in python string and also use .format on it?
... insertion ordered, so it wouldn't be an issue. Versions of Python between 2.7 and 3.5 can use OrderedDict from the collections library.
– twasbrillig
Jul 1 '18 at 18:47
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libxml install error using pip
...
also Cent OS 6.4, with python-2.7
– florin.bunau
Aug 27 '13 at 7:39
confi...
When to use os.name, sys.platform, or platform.system?
...atform.system() degenerates to sys.platform
Here is what the Source Python2.7\Lib\Platform.py\system says
def system():
""" Returns the system/OS name, e.g. 'Linux', 'Windows' or 'Java'.
An empty string is returned if the value cannot be determined.
"""
return uname()[0]
de...
No module named pkg_resources
... working again. My problem arose from Cygwin upgrading Python from 2.6 to 2.7 behind my back while installing something unrelated.
– Steve Pitchers
Mar 21 '13 at 9:27
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