dataframeの特定の列を用いて、値が変化した回数を取得する

Name: dataframeの特定の列を用いて、値が変化した回数を取得する Python generate-function | Programming Helper
Rating: 4.9 (8864 reviews)

def count_change(df, column_name):
    
    # change_dataは、column_nameの値が変化した箇所のみ格納される 
    change_data = df.loc[df.index[0], column_name]
    
    for column in df[column_name]:
        
        if column != change_data:
            change_data = column
            count += 1
    
    return count

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