计算字符串中的位数，然后在 Pandas 数据框中创建具有计数的新列

Question

I have a pandas dataframe with a column that contains strings of Twitter screennames eg 'JohnDoe2719'. I want to count the amount of numbers in each user name eg 4, and then create a new column in my pandas dataframe with the counts for each screenname.

Some help in this would be much appreciated.

Answer 1

You can use str.count with '\d' as regex:

df = pd.DataFrame({'name': ['JohnDoe2719', 'JohnDoe123', 'JohnDoe']})

df['count'] = df['name'].str.count(r'\d')

output:

          name  count
0  JohnDoe2719      4
1   JohnDoe123      3
2      JohnDoe      0