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Python argparse: default value or specified value
...rgparse.ArgumentParser()
parser.add_argument('--example', nargs='?', const=1, type=int)
args = parser.parse_args()
print(args)
% test.py
Namespace(example=None)
% test.py --example
Namespace(example=1)
% test.py --example 2
Namespace(example=2)
nargs='?' means 0-or-1 arguments
const=1 sets...
Difference between Xcode version (CFBundleShortVersionString) and build (CFBundleVersion)
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edited Jul 20 '12 at 17:36
answered Jul 30 '11 at 6:10
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How to replace NaN values by Zeroes in a column of a Pandas Dataframe?
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12 Answers
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How do I build a numpy array from a generator?
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130
Numpy arrays require their length to be set explicitly at creation time, unlike python lists. ...
Fastest sort of fixed length 6 int array
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163
For any optimization, it's always best to test, test, test. I would try at least sorting netw...
Fastest way to find second (third…) highest/lowest value in vector or column
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15 Answers
15
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Javascript - sort array based on another array
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21 Answers
21
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How to redirect both stdout and stderr to a file [duplicate]
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If you want to log to the same file:
command1 >> log_file 2>&1
If you want different files:
command1 >> log_file 2>> err_file
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impr...
Popup弹出菜单扩展 · App Inventor 2 中文网
...temChecked函数更改菜单项的复选框状态。项目计数(ItemNo)从1开始。
可以使用SetMenuItemEnabled函数停用单个菜单行。文本和符号以浅灰色显示，项目不再响应点击。项目计数(ItemNo)从1开始。
设计器的AutoCheck属性可用于确定带有复选...
Flexbox and Internet Explorer 11 (display:flex in ?)
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153
According to http://caniuse.com/#feat=flexbox:
"IE10 and IE11 default values for flex are 0 0...