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List comprehension on a nested list?
...
332
Here is how you would do this with a nested list comprehension:
[[float(y) for y in x] for x ...
How to print a percentage value in python?
...age floating point precision type:
>>> print "{0:.0%}".format(1./3)
33%
If you don't want integer division, you can import Python3's division from __future__:
>>> from __future__ import division
>>> 1 / 3
0.3333333333333333
# The above 33% example would could now be w...
How to pad zeroes to a string?
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Strings:
>>> n = '4'
>>> print(n.zfill(3))
004
And for numbers:
>>> n = 4
>>> print(f'{n:03}') # Preferred method, python >= 3.6
004
>>> print('%03d' % n)
004
>>> print(format(n, '03')) # python >= 2.6
004
>>> ...
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...得无所适从而产生冲突。
另一种情况假如 tomact2,tomcat3同步tomcat1的目录，当tomcat1挂了之后，负载均衡会把访问分配到tomcat2和3，这个时候tomcat2和3彼此独立。客户分别对这两台机器进行读写于是数据又不同步了。
1.2 分布式...
How can I check which version of Angular I'm using?
...26
Kabb5
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answered Apr 15 '13 at 14:35
TheHippoTheHippo...
Postgres NOT in array
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137
SELECT COUNT(*) FROM "messages" WHERE NOT (3 = ANY (recipient_ids))
You can always negate WHE...
How Does Modulus Divison Work
... means:
27 / 16 = 1, remainder 11
=> 27 mod 16 = 11
Other examples:
30 / 3 = 10, remainder 0
=> 30 mod 3 = 0
35 / 3 = 11, remainder 2
=> 35 mod 3 = 2
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How to return a part of an array in Ruby?
...#=> nil
a[1, 2] #=> [ "b", "c" ]
a[1..3] #=> [ "b", "c", "d" ]
a[4..7] #=> [ "e" ]
a[6..10] #=> nil
a[-3, 3] #=> [ "c", "d", "e" ]
# special cases
a[5] ...
How to use php serialize() and unserialize()
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173
A PHP array or object or other complex data structure cannot be transported or stored or otherwi...
Is there a ceiling equivalent of // operator in Python?
I found out about the // operator in Python which in Python 3 does division with floor.
7 Answers
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