, maxwidth=76, output=None, toplevel='numpy')[source]#

Get help information for an array, function, class, or module.

objectobject or str, optional

Input object or name to get information about. If object is an ndarray instance, information about the array is printed. If object is a numpy object, its docstring is given. If it is a string, available modules are searched for matching objects. If None, information about info itself is returned.

maxwidthint, optional

Printing width.

outputfile like object, optional

File like object that the output is written to, default is None, in which case sys.stdout will be used. The object has to be opened in ‘w’ or ‘a’ mode.

toplevelstr, optional

Start search at this level.


When used interactively with an object, is equivalent to help(obj) on the Python prompt or obj? on the IPython prompt.


   polyval(p, x)
     Evaluate the polynomial p at x.

When using a string for object it is possible to get multiple results.

     *** Found in numpy ***
Core FFT routines
     *** Found in numpy.fft ***
 fft(a, n=None, axis=-1)
     *** Repeat reference found in numpy.fft.fftpack ***
     *** Total of 3 references found. ***

When the argument is an array, information about the array is printed.

>>> a = np.array([[1 + 2j, 3, -4], [-5j, 6, 0]], dtype=np.complex64)
class:  ndarray
shape:  (2, 3)
strides:  (24, 8)
itemsize:  8
aligned:  True
contiguous:  True
fortran:  False
data pointer: 0x562b6e0d2860  # may vary
byteorder:  little
byteswap:  False
type: complex64