基本转换方法或模块 [英] Base conversion method or module

问题描述

是否有可以在数字基础之间转换的Python模块或方法？具体来说，我需要在Hex，Decimal和Binary之间转换
，例如5Ah = 90d = 01011010b。


我在很多地方搜索但是找不到特定于Python的。


谢谢，杰夫

Is there a Python module or method that can convert between numeric bases? Specifically, I need to
convert between Hex, Decimal and Binary such as 5Ah = 90d = 01011010b.

I searched many places but couldn''t find a Python specific one.

Thanks, Jeff

推荐答案

Jeff Wagner在消息中写道< 0b ******************************** @ 4ax.com> ...

Jeff Wagner wrote in message <0b********************************@4ax.com>...

是否有可以在数字基础之间转换的Python模块或方法？
具体来说，我需要在Hex，Decimal和Binary之间进行转换，例如5Ah = 90d = 01011010b。

我搜索了很多地方但却找不到特定于Python的地方。

谢谢，杰夫

Is there a Python module or method that can convert between numeric bases? Specifically, I need toconvert between Hex, Decimal and Binary such as 5Ah = 90d = 01011010b.

I searched many places but couldn''t find a Python specific one.

Thanks, Jeff

有一个Python菜谱配方做了这些转换，

IIRC。浏览一下 http://aspn.activestate.com/ASPN/Cookbook/Python 。

数字也可以做这类事情，但我不知道。


Python本身可以让你走得很远;问题在于，使转换成为可传播的有点不稳定。


例如，int（）和long（）都接受一个字符串一个基本参数，所以

你可以将任何基数（2< = base< = 36）转换为Python int或

long。


Python也可以反过来，取一个数字并转换为你想要的基数的

字符串表示。问题？对于hex和oct只有一个

函数，而不是bin或任何其他基础

int可以处理。


理想情况下，有一个do-it-all函数是int（）的反函数：取

a数并在任何基数中吐出一个字符串表示形式（2 -36）你想要的。


但二元情况非常简单：


def bin（数字）：

""" bin（number） - > string


返回整数或长整数的二进制表示。


"""

如果数字== 0：返回''0b0''

binrep = []

而数字> 0：

binrep.append（数字& 1）

数字>> = 1

binrep.reverse（）

返回''0b''+''' '.join（map（str，binrep））

处理负的int是读者的练习....


还记得Python有十六进制和八进制文字。

-

弗朗西斯阿维拉

There was a Python cookbook recipe that did these kinds of conversions,
IIRC. Look around at http://aspn.activestate.com/ASPN/Cookbook/Python.
Numeric might do this sort of thing, too, but I don''t know.

Python itself can get you pretty far; the problem is that it''s a bit spotty
in making conversions communicable.

For example, int() and long() both accept a string with a base argument, so
you can convert just about any base (2 <= base <= 36) to a Python int or
long.

Python can also go the other way around, taking a number and converting to a
string representation of the bases you want. The problem? There''s only a
function to do this for hex and oct, not for bin or any of the other bases
int can handle.

Ideally, there''s be a do-it-all function that is the inverse of int(): take
a number and spit out a string representation in any base (2-36) you want.

But the binary case is pretty simple:

def bin(number):
"""bin(number) -> string

Return the binary representation of an integer or long integer.

"""
if number == 0: return ''0b0''
binrep = []
while number >0:
binrep.append(number&1)
number >>= 1
binrep.reverse()
return ''0b''+''''.join(map(str,binrep))
Dealing with negative ints is an exercise for the reader....

Remember also that Python has hex and octal literals.
--
Francis Avila

2003年12月7日星期日15:45:41 -0500，Francis Avila < FR *********** @ yahoo.com> wrotf：

On Sun, 7 Dec 2003 15:45:41 -0500, "Francis Avila" <fr***********@yahoo.com> wrotf:

Jeff Wagner在留言中写道< 0b ************************ ******** @ 4ax.com> ...

Jeff Wagner wrote in message <0b********************************@4ax.com>...

是否有可以在数字基础之间转换的Python模块或方法？

Is there a Python module or method that can convert between numeric bases?

具体来说，我需要to

Specifically, I need to

在Hex，Decimal和Binary之间转换，例如5Ah = 90d = 01011010b。

我在很多地方搜索但是找不到特定于Python的地方。
谢谢，杰夫

convert between Hex, Decimal and Binary such as 5Ah = 90d = 01011010b.

I searched many places but couldn''t find a Python specific one.

Thanks, Jeff

有一个Python菜谱配方做了这些转换，
IIRC。浏览一下 http://aspn.activestate.com/ASPN/Cookbook/Python 。
数字也可以做这种事情，但我不知道。

Python本身可以让你走得很远;问题在于，在使转换成为可传播方面有点不稳定。

例如，int（）和long（）都接受带有基本参数的字符串，所以
你可以将任何基数（2< = base< = 36）转换为Python int或
long。

Python也可以反过来，取一个数字并转换为您想要的基础的字符串表示。问题？对于hex和oct，只有一个
函数可以执行此操作，而不是bin或任何其他基础
int可以处理。

理想情况下，有是一个do-it-all函数，它是int（）的反函数：取一个数字并在你想要的任何基数（2-36）中吐出一个字符串表示。

但是二元情况非常简单：

def bin（数字）：
""" bin（number） - > string

返回整数或长整数的二进制表示。

"""
如果number == 0：return''0b0''
binrep = []
while number> 0：
binrep.append（number& 1）
number>> = 1
binrep.reverse（）
返回''0b''+''''。join（map（str，binrep））

处理否定的int是读者的练习....
请记住，Python有十六进制和八进制文字。

There was a Python cookbook recipe that did these kinds of conversions,
IIRC. Look around at http://aspn.activestate.com/ASPN/Cookbook/Python.
Numeric might do this sort of thing, too, but I don''t know.

Python itself can get you pretty far; the problem is that it''s a bit spotty
in making conversions communicable.

For example, int() and long() both accept a string with a base argument, so
you can convert just about any base (2 <= base <= 36) to a Python int or
long.

Python can also go the other way around, taking a number and converting to a
string representation of the bases you want. The problem? There''s only a
function to do this for hex and oct, not for bin or any of the other bases
int can handle.

Ideally, there''s be a do-it-all function that is the inverse of int(): take
a number and spit out a string representation in any base (2-36) you want.

But the binary case is pretty simple:

def bin(number):
"""bin(number) -> string

Return the binary representation of an integer or long integer.

"""
if number == 0: return ''0b0''
binrep = []
while number >0:
binrep.append(number&1)
number >>= 1
binrep.reverse()
return ''0b''+''''.join(map(str,binrep))
Dealing with negative ints is an exercise for the reader....

Remember also that Python has hex and octal literals.

弗朗西斯，


我找到了Python食谱你指的食谱。它如下：


模块名称是BaseConvert.py .......


＃！/ usr / bin / env python


BASE2 =" 01"

BASE10 =" 0123456789"

BASE16 =" 0123456789ABCDEF"

BASE62 =" ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklm nopqrstuvwxyz"

def convert（number，fromdigits，todigits）：


if str（数字）[0] =='' - ''：

number = str（数字）[1：]

neg = 1

否则：

neg = 0

＃从数字中取出一个整数

x = long（0）
str（数字）中的数字为
：

x = x * len（fromdigits）+ fromdigits.index（数字）


＃创建结果在base''len（todigits）''

res =""

而x> 0：

digit = x％len （todigits）

res = todigits [数字] + res

x / = len（todigits）

if neg：

res =" - " + re s


返回res


导入此模块并调用它时出错。


＃！/ usr / bin / python

导入BaseConvert

打印BaseConvert.convert（90，BASE10，BASE2）


名称错误：名称''Base10''未定义。


这可能与命名空间有关，这些命名空间刚刚咬我。我认为

因为''Base''定义是全局的这个模块（BaseConvert.py）通过在外面定义

函数（转换），当我导入这个模块，它们也是全球性的。


从我的一本书中，它说，导入语句创建一个包含所有
$的新命名空间b $ b模块的属性。要访问此命名空间中的属性，请使用模块的名称

object作为前缀：import MyModule ... a = MyModule.f（）"这就是我以为我在做什么

做什么。


我还缺少什么？


谢谢，

Jeff

Francis,

I found the Python cookbook recipe you were referring to. It is as follows:

The module name is BaseConvert.py .......

#!/usr/bin/env python

BASE2 = "01"
BASE10 = "0123456789"
BASE16 = "0123456789ABCDEF"
BASE62 = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklm nopqrstuvwxyz"

def convert(number,fromdigits,todigits):

if str(number)[0]==''-'':
number = str(number)[1:]
neg=1
else:
neg=0

# make an integer out of the number
x=long(0)
for digit in str(number):
x = x*len(fromdigits) + fromdigits.index(digit)

# create the result in base ''len(todigits)''
res=""
while x>0:
digit = x % len(todigits)
res = todigits[digit] + res
x /= len(todigits)
if neg:
res = "-"+res

return res

I am getting an error when I import this module and call it.

#!/usr/bin/python

import BaseConvert
print BaseConvert.convert(90,BASE10,BASE2)

Name Error: name ''Base10'' is not defined.

This probably has something to do with namespaces which was biting me a while ago. I thought that
since the ''Base'' definitions were global to this module (BaseConvert.py) by being defined outside
the function (convert), that when I imported this module, they would be global, too.

From one of my books, it says, "An import statement creates a new namespace that contains all the
attributes of the module. To access an attribute in this namespace, use the name of the module
object as a prefix: import MyModule ... a = MyModule.f( )" which is what I thought I was
doing.

What am I still missing?

Thanks,
Jeff

Jeff Wagner写道：

Jeff Wagner wrote:

我找到了你所指的Python菜谱配方。它如下：


（仅发布一个URL有什么问题？）

导入此模块并调用时出错它。

＃！/ usr / bin / python
导入BaseConvert
打印BaseConvert.convert（90，BASE10，BASE2）

>名称错误：名称''Base10''未定义。

这可能与命名空间有关，这些命名空间刚刚咬我。我认为，因为''Base''定义对于这个
模块（BaseConvert.py）是全局定义的，所以在函数外部定义（转换），
当我导入这个模块时，它们将是全局的也是。 Python中的


，全局表示属于某个模块，而不是在我的整个程序中所有

模块中都可见

我还缺少什么？

I found the Python cookbook recipe you were referring to. It is as follows:
(what''s wrong with just posting an URL?)
I am getting an error when I import this module and call it.

#!/usr/bin/python

import BaseConvert
print BaseConvert.convert(90,BASE10,BASE2)

Name Error: name ''Base10'' is not defined.

This probably has something to do with namespaces which was biting me
a while ago. I thought that since the ''Base'' definitions were global to this
module (BaseConvert.py) by being defined outside the function (convert),
that when I imported this module, they would be global, too.
in Python, "global" means "belonging to a module", not "visible in all
modules in my entire program"
What am I still missing?

更改调用以使用BaseConvert.BASE10和BaseConvert.BASE2

了解有关本地和全球名称的更多信息，请阅读：

http://www.python.org/doc /current/ref/naming.html


< / F>

change the call to use BaseConvert.BASE10 and BaseConvert.BASE2

to learn more about local and global names, read this:

http://www.python.org/doc/current/ref/naming.html

</F>

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