python 入门坑

使用ipython 解释器

绘图

from numpy 
import array a = array([1, 2, 3, 4]) 
a

%matplotlib inline 
from matplotlib.pyplot 
import plot plot(a, a**2)

错误

Shell is already running a gui event loop for osx. Call with no arguments to disable the current loop. Out[3]: [<matplotlib.lines.Line2D at 0x1105ec820>]

参考网页

替换
%matplotlib inline
->
%matplotlib 

%matplotlib 
from matplotlib.pyplot 
import plot plot(a, a**2)

如下