回答編集履歴
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追記
test
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@@ -97,3 +97,125 @@
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参考：
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[pandasでユニークな要素の個数、頻度（出現回数）をカウント | note.nkmk.me](https://note.nkmk.me/python-pandas-value-counts/)
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### 追記
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「すべて任意の数（たとえば5）の列を除去したい」ということだったので、
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```python
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import io
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import pandas as pd
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txt = """
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a,b,c,d,e,f
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0,0,1,5,5,5
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4,5,3,5,4,5
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0,7,5,5,4,5
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4,5,6,5,7,5
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4,7,8,5,4,5
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"""
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df = pd.read_csv(io.StringIO(txt), header=0)
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print(df)
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""" =>
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a b c d e f
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0 0 0 1 5 5 5
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1 4 5 3 5 4 5
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2 0 7 5 5 4 5
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3 4 5 6 5 7 5
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4 4 7 8 5 4 5
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"""
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print(df==5)
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""" =>
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a b c d e f
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0 False False False True True True
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1 False True False True False True
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2 False False True True False True
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3 False True False True False True
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4 False False False True False True
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"""
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print(~(df == 5).all(axis=0))
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""" =>
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a True
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b True
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c True
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d False
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e True
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f False
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dtype: bool
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"""
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print(df.loc[:, ~(df == 5).all(axis=0)])
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""" =>
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a b c e
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0 0 0 1 5
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1 4 5 3 4
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2 0 7 5 4
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3 4 5 6 7
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4 4 7 8 4
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"""
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```
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df全体を5と比較してbooleanにし、`~(df == 5).all(axis=0)`で残す列を選択します。
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