如何在python中查找有關函數的信息？

Question

我知道在R中，你只需鍵入？「function_name」。你如何在Python中做到這一點？具體而言，我試圖在pyplot庫中找到有關set_position的信息。

Answer 1

help(function) 

應該這樣做。

演示：

def func(): 
    """ 
    I am a function who doesn't do anything, 
    I just sit in your namespace and crowd it up. 
    If you call me expecting anything 
    I'll just return to you the singleton None 
    """ 
    pass 

help(func) 

Answer 2

在ipython其supereasy - 只是追加?（或??用於與源代碼的擴展信息）到所討論的功能。

我matplotlib交互工作時，總是使用它：

In [2]: from matplotlib.axes import Axes 

In [3]: Axes.set_position?? 
Type:  instancemethod 
String Form:<unbound method Axes.set_position> 
File:  /home/tzelleke/.local/modules/active_python_2.7/lib/python2.7/site-packages/matplotlib/axes.py 
Definition: Axes.set_position(self, pos, which='both') 
Source: 
    def set_position(self, pos, which='both'): 
     """ 
     Set the axes position with:: 

      pos = [left, bottom, width, height] 

     in relative 0,1 coords, or *pos* can be a 
     :class:`~matplotlib.transforms.Bbox` 

     There are two position variables: one which is ultimately 
     used, but which may be modified by :meth:`apply_aspect`, and a 
     second which is the starting point for :meth:`apply_aspect`. 


     Optional keyword arguments: 
      *which* 

      ========== ==================== 
      value  description 
      ========== ==================== 
      'active'  to change the first 
      'original' to change the second 
      'both'  to change both 
      ========== ==================== 

     """ 
     if not isinstance(pos, mtransforms.BboxBase): 
      pos = mtransforms.Bbox.from_bounds(*pos) 
     if which in ('both', 'active'): 
      self._position.set(pos) 
     if which in ('both', 'original'): 
      self._originalPosition.set(pos) 

In [4]: 

Answer 3

嘗試在ipython運行，在這種情況下，你可以輸入：

In [1]: from matplotlib import pyplot as pl 

In [2]: pl.set_position? 
Object `pl.set_position` not found. 

在這裏，你必須使用google找出set_position是Axes類的一種方法：

In [3]: pl.Axes.set_position? 
Type:  instancemethod 
String Form:<unbound method Axes.set_position> 
File:  /opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/axes.py 
Definition: pl.Axes.set_position(self, pos, which='both') 
Docstring: 
Set the axes position with:: 

    pos = [left, bottom, width, height] 

in relative 0,1 coords, or *pos* can be a 
:class:`~matplotlib.transforms.Bbox` 

There are two position variables: one which is ultimately 
used, but which may be modified by :meth:`apply_aspect`, and a 
second which is the starting point for :meth:`apply_aspect`. 


Optional keyword arguments: 
    *which* 

    ========== ==================== 
    value  description 
    ========== ==================== 
    'active'  to change the first 
    'original' to change the second 
    'both'  to change both 
    ========== ====================