ipython交互模式下函数的回声是什么？

如何解决ipython交互模式下函数的回声是什么？

我知道交互式模型输出通常是 __repr__ 方法返回。

但在 IPython 或 jupyter 中没有。

例如：

In [1]: abs
Out[1]: <function abs(x,/)>

In [2]: repr(abs)
Out[2]: '<built-in function abs>'

In [3]: str(abs)
Out[3]: '<built-in function abs>'

在原始python中：

>>> abs
<built-in function abs>

如何获取程序中的 <function abs(x,/)> 字符串？

解决方法

以下是在多个平台上测试 repr() 的结果。所有返回相同的描述：<built-in function abs>

测试代码：

import sys,platform
print("repr:  ",getattr(__builtins__,"abs").__repr__()); \
print("os:    ",platform.system(),platform.release()); \
print("python:",sys.version,sys.version_info); 

结果：

iPython online (rollapp.com)
----------------------------
repr:   <built-in function abs>
os:     Linux 4.15.0-137-generic
python: 3.5.2 (default,Nov 23 2017,16:37:01)
[GCC 5.4.0 20160609] sys.version_info(major=3,minor=5,micro=2,releaselevel='final',serial=0)


Interactive IPython 7.8.0 browser (pythonanywhere.com)
------------------------------------------------------
repr:   <built-in function abs>
os:     Linux 5.4.0-1029-aws
python: 3.8.0 (default,Nov 14 2019,22:29:45)
        [GCC 5.4.0 20160609] sys.version_info(major=3,minor=8,micro=0,serial=0)

Jupyter online (jupyter.org)
----------------------------
repr:   <built-in function abs>
os:     Linux 4.19.150+
python: 3.n7.8 | packaged by conda-forge | (default,Nov 17 2020,23:42:15)
        [GCC 7.5.0] sys.version_info(major=3,minor=7,micro=8,serial=0)


Jupyter online (cocalc.com)
---------------------------
repr:   <built-in function abs>
os:     Linux 5.4.0-1036-gcp
python: 3.8.5 (default,Jan 27 2021,15:41:15) 
        [GCC 9.3.0] sys.version_info(major=3,micro=5,serial=0)


macOS Catalina,python 2.7 (local)
----------------------------------
repr:   <built-in function abs>
os:     Darwin 19.6.0
python: 2.7.16 (default,Jun  5 2020,22:59:21) 
        [GCC 4.2.1 Compatible Apple LLVM 11.0.3 (clang-1103.0.29.20) (-macos10.15-objc- sys.version_info(major=2,micro=16,python 3.8 (local)
----------------------------------
repr:   <built-in function abs>
os:     Darwin 19.6.0
python: 3.8.8 (default,Feb 26 2021,23:59:43) 
        [Clang 12.0.0 (clang-1200.0.32.29)] sys.version_info(major=3,serial=0)


Python 3.4 online (onlinegdb.com)
---------------------------------
repr:   <built-in function abs>
os:     Linux 4.15.0-1044-gcp
python: 3.4.3 (default,Nov 12 2018,22:25:49)
        [GCC 4.8.4] sys.version_info(major=3,minor=4,micro=3,serial=0)


Python 3.8 online (repl.it)
---------------------------
repr:   <built-in function abs>
os:     Linux 5.4.0-1042-gcp
python: 3.8.9 (default,Apr  3 2021,01:00:00) 
        [GCC 7.5.0] sys.version_info(major=3,micro=9,serial=0)

,

您可以使用 getattr(__builtins__,"abs") 获取内置属性名称，使用普通的 str() 获取字符串表示，即：

>>> f = getattr(__builtins__,"abs")

>>> f
<built-in function abs>

>>> type(f)
<class 'builtin_function_or_method'>

>>> fstr = str(f)

>>> fstr
'<built-in function abs>'

>>> type(fstr)
<class 'str'>

或蟒蛇

getattr(__builtin__,"abs")