问映射列值的子字符串

EN

df['Region'] = df.Zip_code.astype(str).str[:2].map({'11':'A', '22':'B', '44':'C'})

print(df)
   Zip_code  product_id Region
0    110034       55454      A
1    114242       45445      A
2    113564       46454      A
3    223434       53533      B
4    224535       56455      B
5    223435       63535      B
6    444345       62435      C
7    443535       24353      C

import pandas as pd


#map between first-digits in Zip-Code and Region
regions_map = {11: "A", 22:"B", 44:"C"}

df["Region"] = df["Zip_code"].apply(lambda x: regions_map[int(str(x)[:2])])

print(df)
#   Zip_code  product_id Region
#0    110034       55454      A
#1    114242       45445      A
#2    113564       46454      A
#3    223434       53533      B
#4    224535       56455      B
#5    223435       63535      B
#6    444345       62435      C
#7    443535       24353      C