如何计算 dataframe 中的特定元素？

Question

In a dataframe like below

          equips
0       bags, balls 
1        glasses
2    shoes, caps, bags
3          NaN
4     spoons, balls

I want to count the numbers of comma and make another column like below

          equips              the number of comma
0       bags, balls                    1
1        glasses                       0
2    shoes, caps, bags                 2
3          NaN                         0
4     spoons, balls                    1

Please, I need your help..!

Answer 1

You can use str.count method as follows:

df['the number of comma'] = df['equips'].str.count(',')

Answer 2

You can use simple list comprehension like so:

df['the number of comma'] = [i.count(',') for i in df['equips']]