在python中自己的结果旁边打印客户编号

原文标题 ：print customer number next to the own result in python

我的代码：

import pandas as pd
from sklearn.tree import DecisionTreeClassifier
from sklearn.model_selection import train_test_split

df = pd.read_csv('orderlist.csv', skiprows=1, delimiter=';', encoding="utf8")
df.columns = ["date", "customer_number", "item_code", "quantity"]

df['customer_item'] = df.customer_number + ', ' + df.item_code
df['date'] = pd.to_datetime(df['date'])

df["quantity"] = df["quantity"].astype(int, errors='ignore')

df["week"]=df.date.dt.week
df_grup = df.groupby(by=['week',"customer_item"]).quantity.sum().reset_index()
df_dum = pd.get_dummies(df_grup)

X, y = df_dum, df_dum["quantity"]
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=0)

dtree = DecisionTreeClassifier().fit(X_train, y_train)
predict = dtree.fit(X_train, y_train)
y_pred = dtree.predict(X_test)

pred_quantity = dtree.predict(df_dum)
print("predict quantity:")
print(pred_quantity)

结果：

predict quantity:
[100   5 450 ... 295  22 639]

我需要在自己的结果旁边打印客户编号。