y56

https://stackoverflow.com/questions/664118/whats-the-difference-between-dict-and

>>> from timeit import timeit
>>> timeit("a = {'a': 1, 'b': 2}")
0.424...
>>> timeit("a = dict(a = 1, b = 2)")
0.889...

y56

https://stackoverflow.com/questions/6130768/return-none-if-dictionary-key-is-not-available

You can use dict.get()

value = d.get(key)

which will return None if key is not in d. You can also provide a different default value that will be returned instead of None:

value = d.get(key, "empty")

y56

from collections import OrderedDict
myOrderedDict = OrderedDict()
myOrderedDict['a'] = 1
myOrderedDict['b'] = 2
myOrderedDict.popitem(last = False)  # Setting last to False signals you wanted to remove the first. 

y56

That being said, conforming your Python code to PEP 8 is generally a good idea and helps make code more consistent when working on projects with other developers. There is a command-line program, pycodestyle (previously known as pep8), that can check your code for conformance. Install it by running the following command in your terminal:

$ pip install pycodestyle

Then run it on a file or series of files to get a report of any violations.

$ pycodestyle optparse.py
optparse.py:69:11: E401 multiple imports on one line
optparse.py:77:1: E302 expected 2 blank lines, found 1
optparse.py:88:5: E301 expected 1 blank line, found 0

y56

The program autopep8 can be used to automatically reformat code in the PEP 8 style. Install the program with:

$ pip install autopep8

Use it to format a file in-place with:

$ autopep8 --in-place optparse.py

Excluding the --in-place flag will cause the program to output the modified code directly to the console for review. The --aggressive flag will perform more substantial changes and can be applied multiple times for greater effect.

y56

python  要用 pip install numpy
python3 要用 pip3 install numpy
想一想也是很合理

y56

https://color.firefox.com/?theme=XQAAAAIVAQAAAAAAAABBqYhm849SCia2CaaEGccwS-xNKlhW9r_vLXIlVnuJdAic7eRjUc7NRneKMRgQIDK-eQWrkV64LlDNDxf_eMByAZRY7cQeDk2YcCQuge8iz6wsuNPluyBJiPNe5xIoZzicTFzQ6DMdJYDEw-AeRyNROrGJ4T-DeBLGg-1Vj7VZ3d9k5NxuR_XDp27McA_KR92FIt5YLJrt4-wN1xy00G2UBvBL10ttWMmb3Fj4oR16M_W9K9p__-NlUeA

y56

# wine regedit

Search for "LogPixels" there. You will see something like this:
"LogPixels"=dword:00000060

Change 60 to something more suitable. For example this is what I use with my
two displays (one with resolution 1680x1050 and another one with 1280x1024):

"LogPixels"=dword:00000095

y56

https://www.geeksforgeeks.org/global-keyword-in-python/

To access a global variable inside a function there is no need to use global keyword.

If we need to assign a new value to a global variable then we can do that by declaring the variable as global.

This output is an error because we are trying to assign a value to a variable in an outer scope. This can be done with the use of global variable.

y56

https://www.vpnusers.com/viewtopic.php?t=2861

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