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1. 序言 如笔者在本机上运行netstat时，提示没有这个命令，向来简单粗暴，直接yum -y install netstat，显然是不能正常安装的。 [root@hadoop-103 ~]# yum -y install netstat Loaded plugins: fastestmirror Determining fastest mirrors * base: mirrors.aliyun.com * extras: mirrors.aliyun.com * updates: mirrors.aliyun.com base | 3.6 kB 00:00:00 extras | 2.9 kB 00:00:00 updates | 2.9 kB 00:00:00 (1/2): extras/7/x86_64/primary_db | 153 kB 00:00:00 (2/2): updates/7/x86_64/primary_db | 5.1 MB 00:00:02 No package netstat available. Error: Nothing to do [root@hadoop-103 ~]# 这种情况下，怎么办呢？ 2. 使用“yum search”命令 此时可以使用“yum search”来查询这个命令在哪个包中： [root@hadoop-103 ~]$

python学习笔记，特做记录，分享给大家，希望对大家有所帮助。 偏函数 Python的functools模块提供了很多有用的功能，其中一个就是偏函数（Partial function）。要注意，这里的偏函数和数学意义上的偏函数不一样。 在介绍函数参数的时候，我们讲到，通过设定参数的默认值，可以降低函数调用的难度。而偏函数也可以做到这一点。举例如下： int()函数可以把字符串转换为整数，当仅传入字符串时，int()函数默认按十进制转换： print int('123456') 运行结果： 123456 Process finished with exit code 0 但int()函数还提供额外的base参数，默认值为10。如果传入base参数，就可以做N进制的转换： print int('123456', base=8) print int('123456', 16) 运行结果： 42798 1193046 Process finished with exit code 0 假设要转换大量的二进制字符串，每次都传入int(x, base=2)非常麻烦，于是，我们想到，可以定义一个int2()的函数，默认把base=2传进去： def int2(x, base=2): return int(x, base) 这样，我们转换二进制就非常方便了： def int2(x, base=2

本文和大家分享的主要是 python 中偏向函数相关内容，一起来看看吧，希望对大家 学习 python 有所帮助。 　　在介绍函数参数的时候，我们讲到，通过设定参数的默认值，可以降低函数调用的难度。而偏函数也可以做到这一点。举例如下： 　　 int() 函数可以把字符串转换为整数，当仅传入字符串时， int() 函数默认按十进制转换： >>> int('12345') 12345 　　但 int() 函数还提供额外的 base 参数，默认值为 10 。如果传入 base 参数，就可以做 N 进制的转换： >>> int('12345', base=8 5349 >>> int('12345', 16) 74565 　　假设要转换大量的二进制字符串，每次都传入 int(x, base=2) 非常麻烦，于是，我们想到，可以定义一个 int2() 的函数，默认把 base=2 传进去： 　　 def int2 (x, base=2): 　　 return int(x, base) 　　这样，我们转换二进制就非常方便了： >>> int2('1000000') 64 >>> int2('1010101') 85 　　 functools.partial 就是帮助我们创建一个偏函数的，不需要我们自己定义 int2() ，可以直接使用下面的代码创建一个新的函数 int2 ： >>>

So, I am trying to write a program to decode 6-character base-64 numbers. Here is the problem statement: Return the 36-bit number represented as a base-64 number in reverse order by the 6-character string s where the order of the 64 numerals is: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-+ i.e. decode('000000') → 0 decode('gR1iC9') → 9876543210 decode('++++++') → 68719476735 I would like to do this WITHOUT strings. The easiest way to do this would be to create the inverse of the following function: def get_digit(d): ''' Convert a base 64 digit to the desired character '''

Is there a way to convert a decimal number between $0$ and $1$ that is not integer to base 4 in Matlab? E.g. if I put 2/5 I want to get 0.12121212... (with some approximation I guess) The function dec2base only works for integers. Listed in this post is a vectorized approach that works through all possible combinations of digits to select the best one for the final output as a string. Please note that because of its very nature of creating all possible combinations, it would be memory intensive and slower than a recursive approach, but I guess it could be used just for fun or educational

Is it possible to implement an interface in a base class and allow calling/overriding the implemented method in the first derived class level but prevent calling it from any further derived classes? public interface IInterfaceSample { bool Test(); } public class Base: IInterfaceSample { public virtual bool Test() { return True; } } public class Sub1: Base { //I need to be able to override the Test method here public override bool Test() { return True; } } //Under a separate project: public class Sub2: Sub1 { //I need to prevent overriding the interface implementation in this class } Now what i

functools.partial 的作用就是，把一个函数的某些参数给固定住（也就是设置默认值），返回一个新的函数，调用这个新函数会更简单。 注意到上面的新的 int2 函数，仅仅是把 base 参数重新设定默认值为 2 ，但也可以在函数调用时传入其他值： >>> int2('1000000', base=10) 1000000 最后，创建偏函数时，实际上可以接收函数对象、 *args 和 **kw 这3个参数，当传入： int2 = functools.partial(int, base=2) 实际上固定了int()函数的关键字参数 base ，也就是： int2('10010') 相当于： kw = { 'base': 2 } int('10010', **kw) 当传入： max2 = functools.partial(max, 10) 实际上会把 10 作为 *args 的一部分自动加到左边，也就是： max2(5, 6, 7) 相当于： args = (10, 5, 6, 7) max(*args) 结果为 10 。 来源： https://www.cnblogs.com/FinnChan/p/11975440.html

I have a Base MasterPage class, from which my masterpages will inherit. I have some javascript functions there for it's child pages to include. As it's a base class, it does not have a visual designer nor I can add XHTML code. I need to add a hidden field to the class so I can set it's value in the javascript code, and when a postback occurs I can get the setted value on my content pages. Yet I fail to achieve this, for when I try to add the hidden field to the base masterpage's control collection I get a render error (Content Encoding error if viewed in Firefox). And If I try cheating and

I'm trying to convert an integer to a string right now, and I'm having a problem. I've gotten the code written and working for the most part, but it has a small flaw when carrying to the next place. It's hard to describe, so I'll give you an example. Using base 26 with a character set consisting of the lowercase alphabet: 0 = "a" 1 = "b" 2 = "c" ... 25 = "z" 26 = "ba" (This should equal "aa") It seems to skip the character at the zero place in the character set in certain situations. The thing that's confusing me is I see nothing wrong with my code. I've been working on this for too long now,

Base64 encodes three 8-bit characters onto onto four (base-64) 6-bit "characters". Base64 is efficient because it uses a base (64) and exponent (4) that happens to perfectly match a base-10 exponent of 2 (24): 3x8=4x6=24 and 2 24 =64 4 =16777216. It appears that there are no base/exponent combinations that result in values that exactly match base-10 exponents of 2 (specifically 2 n for any 0< n <256), except for base32, base64 and base128 (along with base4, base8, base16, base256, base512, etc which are more difficult to make practical use of). See the last code block for the full list of