python - import pylap as * 报错：NameError: name 'figure' is not defined？

我在运行MIT的python公开课所提供的如下一段代码的时候，Spyder IDE报错

NameError: name 'figure' is not defined

同时，IDE在代码部分给出了错误提示，'from pylab import * unable to detect undefined names'
请教各位，该如何处理这一错误，多谢

补充：有没有可能是这个库没有导进去，但是之前我跑类似的代码，导入pylab是可以正常画图的，中间也没有改变Python或者anaconda的设置，怎么会突然不好用了？作为初学者，真的有些手足无措。

from pylab import * 
import random, math 
 
def flipTrial(numFlips): 
    heads, tails = 0, 0 
    for i in xrange(0, numFlips):  # Comparing traditional range,xrange() save more space
        coin = random.randint(0, 1) 
        if coin == 0: heads += 1 
        else: tails += 1 
    return heads, tails 
 
def simFlips(numFlips, numTrials): 
    diffs = [] 
    for i in xrange(0, numTrials): 
        heads, tails = flipTrial(numFlips) 
        diffs.append(abs(heads - tails)) 
    diffs = array(diffs) 
    diffMean = sum(diffs)/len(diffs) 
    diffPercent = (diffs/float(numFlips))*100 
    percentMean = sum(diffPercent)/len(diffPercent) 
    hist(diffs)     
    axvline(diffMean, color = 'r', label = 'Mean') 
    legend() 
    titleString = str(numFlips) +  ' Flips, ' + str(numTrials) + ' Trials' 
    title(titleString) 
    xlabel('Difference between heads and tails') 
    ylabel('Number of Trials') 
    figure() 
    plot(diffPercent)         
    axhline(percentMean, color = 'r', label = 'Mean') 
    legend() 
    title(titleString) 
    xlabel('Trial Number') 
    ylabel('Percent Difference between heads and tails')
    
simFlips(100,100)
show()