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Get path from open file in Python
...file.TemporaryFile you mentioned. This is specific case for temporary file and, as seen in the docs, there is already existing solution. tempfile.TemporaryFile is not meant to be used in case you want to read the name.
– Tadeck
Dec 6 '12 at 21:12
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Is a Java hashmap search really O(1)?
I've seen some interesting claims on SO re Java hashmaps and their O(1) lookup time. Can someone explain why this is so? Unless these hashmaps are vastly different from any of the hashing algorithms I was bought up on, there must always exist a dataset that contains collisions.
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What is the difference between lower bound and tight bound?
...the upper bound, while Omega is the lower bound. Theta requires both Big O and Omega, so that's why it's referred to as a tight bound (it must be both the upper and lower bound).
For example, an algorithm taking Omega(n log n) takes at least n log n time, but has no upper limit. An algorithm taking...
How to access command line parameters?
The Rust tutorial does not explain how to take parameters from the command line. fn main() is only shown with an empty parameter list in all examples.
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How to run a Python script in the background even after I logout SSH?
I have Python script bgservice.py and I want it to run all the time, because it is part of the web service I build. How can I make it run continuously even after I logout SSH?
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Java String new line
...t's better to use %n as an OS independent new-line character instead of \n and it's easier than using System.lineSeparator()
Why to use %n, because on each OS, new line refers to a different set of character(s);
Unix and modern Mac's : LF (\n)
Windows : CR LF (\r\n)
Olde...
数据结构、算法复杂度一览表 - 更多技术 - 清泛网 - 专注IT技能提升
...ter
界限
growth
性能
(theta) Θ
upper and lower, tight
equal
= n
(big-oh) O
upper, tightness unknown
less than or equal
≤ n
(small-oh) o
upper, not tight
less than
< n
(big omega) Ω
lower, tightness unknown
gre...
数据结构、算法复杂度一览表 - 更多技术 - 清泛网 - 专注IT技能提升
...ter
界限
growth
性能
(theta) Θ
upper and lower, tight
equal
= n
(big-oh) O
upper, tightness unknown
less than or equal
≤ n
(small-oh) o
upper, not tight
less than
< n
(big omega) Ω
lower, tightness unknown
gre...
数据结构、算法复杂度一览表 - 更多技术 - 清泛网 - 专注IT技能提升
...ter
界限
growth
性能
(theta) Θ
upper and lower, tight
equal
= n
(big-oh) O
upper, tightness unknown
less than or equal
≤ n
(small-oh) o
upper, not tight
less than
< n
(big omega) Ω
lower, tightness unknown
gre...
数据结构、算法复杂度一览表 - 更多技术 - 清泛网 - 专注IT技能提升
...ter
界限
growth
性能
(theta) Θ
upper and lower, tight
equal
= n
(big-oh) O
upper, tightness unknown
less than or equal
≤ n
(small-oh) o
upper, not tight
less than
< n
(big omega) Ω
lower, tightness unknown
gre...