notebook报错NameError: name ‘sc‘ is not defined解决

关于在notebook中报错的一个问题的解决

报错如下：

NameError                                 Traceback (most recent call last)
 in 
----> 1 sc.stop()
      2 import random
      3 sc = SparkContext(appName="Pi")
      4 num_samples=1000000
      5 def inside(p):

NameError: name 'sc' is not defined

如果你安装了findspark包，那么解决方案如下：

import findspark
findspark.init()
import pyspark

import random
sc = pyspark.SparkContext(appName="Pi")
num_samples = 100000000
def inside(p):     
  x, y = random.random(), random.random()
  return x*x + y*y < 1
count = sc.parallelize(range(0, num_samples)).filter(inside).count()
pi = 4 * count / num_samples
print(pi)
sc.stop()

等待几秒后结果就会出来

结果如下：