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pandas: split string, and count values?

df['word_count'] = df['string'].str.split(';').str.len()
df

     string  word_count
id                     
0   31672;0           2
1   31965;0           2
2   0;78464           2
3     51462           1
4   31931;0           2

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pandas: split string, and count values?

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