개수가 불일치 합니다

안녕하세요. 작업형 2 한가지 방법으로 풀기의 내용으로

예시문제 작업형 2를 푸는데 개수가 맞지 않아서 질문 드립니다..

ValueError: X has 73 features, but DecisionTreeClassifier is expecting 74 features as input.

import pandas as pd

train = pd.read_csv("data/customer_train.csv")
test = pd.read_csv("data/customer_test.csv")

# 사용자 코딩
# print(train.shape, test.shape)
# print(train.head(1), test.head(1))
# print(train['성별'].value_counts())
# print(train.isnull().sum(), test.isnull().sum())
train['환불금액'] = train['환불금액'].fillna(0)
test['환불금액'] = test['환불금액'].fillna(0)

target = train.pop('성별')

print(train.shape, test.shape)
train = pd.get_dummies(train)
test = pd.get_dummies(test)
print(train.shape, test.shape)

from sklearn.model_selection import train_test_split
X_tr, X_val, y_tr, y_val = train_test_split(train, target, test_size=0.2, random_state=0)

print(X_tr.shape, X_val.shape, y_tr.shape, y_val.shape)

from sklearn.ensemble import RandomForestClassifier
rf = RandomForestClassifier(random_state=0)
rf.fit(X_tr, y_tr)
pred = rf.predict_proba(X_val)

from sklearn.metrics import roc_auc_score
roc_auc = roc_auc_score(y_val, pred[:,1])
print('\n roc_auc:', roc_auc)

pred = rf.predict_proba(test)
print(pred[:3])
submit = pd.DataFrame({'pred':pred[:,1]})
submit.to_csv("result.csv", index=False)