pandas DataFrame 中多列的按列字符串计数

Question

I have dataframe as below:

Name            Marks       Place               Points
John-->Hile     50          Germany-->Poland    1
Rog-->Oliver    60-->70     Australia-->US      2
Harry           80          UK                  3
Faye-->George   90          Poland              4

I want a result as below which finds counts of value having "-->"column wise and transpose it and result as below dataframe:

Column Count
Name   3
Marks  1
Place  1

This df is eg.This datframe is dynamic and can vary in each run like in 2nd Run we might have Name,Marks,Place or Name,Marks or anything else, So code should be dynamic which can run on any df.

Answer 1

You can select object columns and column-wise perform a count and summation:

df.select_dtypes(object).apply(lambda x: x.str.contains('-->')).sum()

Name     3
Marks    1
Place    2
dtype: int64

---

Another weird, but interesting method with applymap :

(df.select_dtypes(object)
   .applymap(lambda x: '-->' in x if isinstance(x, str) else False)
   .sum())

Name     3
Marks    1
Place    2
dtype: int64