使用sp.integrate.quad（）时将scipy导入为sp时出错

Question

将scipy导入Python时出错。我写的时候：

import scipy as sp
x2 = lambda x: x**2
print sp.integrate.quad(x2, 0, 4)

我收到错误：

sp.integrate.quad: "NameError: name 'integrate' is not defined".

为什么我收到此错误？

Answer 1

导入scipy不会自动加载integrate子包。使用：

from scipy.integrate import quad

或

import scipy.integrate as spi

并使用spi.quad

来自文档（或者更确切地说，是SciPy的__init__.py文件）：

...
Subpackages
-----------
Using any of these subpackages requires an explicit import.  For example,
``import scipy.cluster``.

::

 cluster                      --- Vector Quantization / Kmeans
 fftpack                      --- Discrete Fourier Transform algorithms
 ...
 integrate                    --- Integration routines [*]
 ...