如何检查熊猫数据帧中每个唯一值的频率

Question

如果我有一个2000的数据帧，其中比方说品牌有142个唯一值，我想计算从1到142的每个唯一值的频率。值应该动态变化。

brand=clothes_z.brand_name
brand.describe(include="all")
unique_brand=brand.unique()
brand.describe(include="all"),unique_brand

输出：

(count       2613
unique      142
top       Mango
freq         54
Name: brand_name, dtype: object,
array(['Jack & Jones', 'TOM TAILOR DENIM', 'YOURTURN', 'Tommy Jeans',
'Alessandro Zavetti', 'adidas Originals', 'Volcom', 'Pier One',
'Superdry', 'G-Star', 'SIKSILK', 'Tommy Hilfiger', 'Karl Kani',
'Alpha Industries', 'Farah', 'Nike Sportswear',
'Calvin Klein Jeans', 'Champion', 'Hollister Co.', 'PULL&BEAR',
'Nike Performance', 'Even&Odd', 'Stradivarius', 'Mango',
'Champion Reverse Weave', 'Massimo Dutti', 'Selected Femme Petite',
'NAF NAF', 'YAS', 'New Look', 'Missguided', 'Miss Selfridge',
'Topshop', 'Miss Selfridge Petite', 'Guess', 'Esprit Collection',
'Vero Moda', 'ONLY Petite', 'Selected Femme', 'ONLY', 'Dr.Denim',
'Bershka', 'Vero Moda Petite', 'PULL & BEAR', 'New Look Petite',
'JDY', 'Even & Odd', 'Vila', 'Lacoste', 'PS Paul Smith',
'Redefined Rebel', 'Selected Homme', 'BOSS', 'Brave Soul', 'Mind',
'Scotch & Soda', 'Only & Sons', 'The North Face',
'Polo Ralph Lauren', 'Gym King', 'Selected Woman', 'Rich & Royal',
'Rooms', 'Glamorous', 'Club L London', 'Zalando Essentials',
'edc by Esprit', 'OYSHO', 'Oasis', 'Gina Tricot',
'Glamorous Petite', 'Cortefiel', 'Missguided Petite',
'Missguided Tall', 'River Island', 'INDICODE JEANS',
'Kings Will Dream', 'Topman', 'Esprit', 'Diesel', 'Key Largo',
'Mennace', 'Lee', "Levi's®", 'adidas Performance', 'jordan',
'Jack & Jones PREMIUM', 'They', 'Springfield', 'Benetton', 'Fila',
'Replay', 'Original Penguin', 'Kronstadt', 'Vans', 'Jordan',
'Apart', 'New look', 'River island', 'Freequent', 'Mads Nørgaard',
'4th & Reckless', 'Morgan', 'Honey punch', 'Anna Field Petite',
'Noisy may', 'Pepe Jeans', 'Mavi', 'mint & berry', 'KIOMI', 'mbyM',
'Escada Sport', 'Lost Ink', 'More & More', 'Coffee', 'GANT',
'TWINTIP', 'MAMALICIOUS', 'Noisy May', 'Pieces', 'Rest',
'Anna Field', 'Pinko', 'Forever New', 'ICHI', 'Seafolly', 'Object',
'Freya', 'Wrangler', 'Cream', 'LTB', 'G-star', 'Dorothy Perkins',
'Carhartt WIP', 'Betty & Co', 'GAP', 'ONLY Tall', 'Next', 'HUGO',
'Violet by Mango', 'WEEKEND MaxMara', 'French Connection'],
dtype=object))

因为它只显示芒果"54"的频率，因为它是最高频率，我想要每个值的频率，比如Jack & Jones、TOM TAILOR DENIM和YOURTURN的频率等等……值应该动态变化。

Answer 1

你可以简单地做，

clothes_z.brand_name.value_counts()

这将列出唯一的值，并为您提供Pandas系列中每个元素的频率。

Answer 2

from collections import Counter

ll = [...your list of brands...]
c = Counter(ll)
# you can do whatever you want with your counted values
df = pd.DataFrame.from_dict(c, orient='index', columns=['counted'])