对字符串列python求和
[英]Sum over string column python
问题描述
I am struggling to count the size of a team. 
我正在努力计算一个团队的规模。 I have for every individual, the name of the team she belongs to. 对于每个人，我都有她所属团队的名字。
There are however hundreds of different teams. 但是，有数百个不同的团队。 I want to construct another column that would count the number of individuals that belong to a given team. 我想构建另一列，该列将计算属于给定团队的个人数量。 I have been able to do a similar operation over a numeric column (using .transform(sum) ), but I can't figure out how to do it when counting over strings. 我已经能够对数字列执行类似的操作（使用.transform（sum）），但是在计算字符串时我无法弄清楚该如何做。
Please do let me know if anything is unclear ! 如果有任何不清楚的地方，请告诉我！
1 个解决方案
解决方案1
1 已采纳 2019-03-02 15:35:03
Are you trying to do it with Pandas? 您是否正在尝试使用Pandas？ If so, try: 如果是这样，请尝试：
df1['count'] = df1.groupby('team', as_index=False)['team'].transform(lambda s: s.count())
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