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How do I import the javax.servlet API in my Eclipse project?
...at, Oracle GlassFish, JBoss AS/WildFly, etc. Usually, just downloading the ZIP file and extracting it is sufficient. In case of Tomcat, do not download the EXE format, that's only for Windows based production environments. See also a.o. Several ports (8005, 8080, 8009) required by Tomcat Server at l...
Combine two columns of text in pandas dataframe
...
Small data-sets (< 150rows)
[''.join(i) for i in zip(df["Year"].map(str),df["quarter"])]
or slightly slower but more compact:
df.Year.str.cat(df.quarter)
Larger data sets (> 150rows)
df['Year'].astype(str) + df['quarter']
UPDATE: Timing graph Pandas 0.23.4
Let's tes...
Getting a map() to return a list in Python 3.x
...e needs to be a general posting on list comprehensions, generators, map(), zip(), and a lot of other speedy iteration goodness in python.
– hughdbrown
Aug 20 '09 at 0:55
46
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内存管理内幕：动态分配的选择、折衷和实现 - C/C++ - 清泛网 - 专注C/C++及内核技术
...n) 时间，不过在大部分情况下会除以一个大的因数，使其变成 O(1)）。
可以预先分配错误处理池（Error-handling pools），以便程序在常规内存被耗尽时仍可以恢复。
有非常易于使用的标准实现。
池式内存的缺点是：
内存池...
How to use filter, map, and reduce in Python 3
...ager
def noiters(*funcs):
if not funcs:
funcs = [map, filter, zip] # etc
from functools import reduce
globals()[reduce.__name__] = reduce
for func in funcs:
globals()[func.__name__] = lambda *ar, func = func, **kwar: list(func(*ar, **kwar))
try:
yield
...
How to make MySQL handle UTF-8 properly
... tables/columns -- except columns that are strictly ascii/hex/country_code/zip_code/etc.
<meta charset charset=UTF-8> if you are outputting to HTML. (Yes the spelling is different here.)
More info ;
UTF8 all the way
The above links provide the "detailed canonical answer is required to addr...
Python matplotlib multiple bars
...ut using pandas and seaborn can save you a lot of time:
df = pd.DataFrame(zip(x*3, ["y"]*3+["z"]*3+["k"]*3, y+z+k), columns=["time", "kind", "data"])
plt.figure(figsize=(10, 6))
sns.barplot(x="time", hue="kind", y="data", data=df)
plt.show()
...
How can I produce an effect similar to the iOS 7 blur view?
...ds/download.action?path=wwdc_2013/wwdc_2013_sample_code/ios_uiimageeffects.zip
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Why does “pip install” inside Python raise a SyntaxError?
...n exe to run it with default python interpreter. By opening pip.exe with 7-zip you can see main.py importing pip, sys and re modules... (And there you'll find the answer how to run it within a python shell)--> pip is a regular python module. Don't forget windows wasn't first platform supporting p...
How do I parallelize a simple Python loop?
...cessing module instead:
pool = multiprocessing.Pool(4)
out1, out2, out3 = zip(*pool.map(calc_stuff, range(0, 10 * offset, offset)))
Note that this won't work in the interactive interpreter.
To avoid the usual FUD around the GIL: There wouldn't be any advantage to using threads for this example a...