max_scalar = array.GetRange()[1] UnboundLocalError: local variable 'array' referenced before assignment应该怎么修正
时间: 2024-02-18 13:37:45 浏览: 31
这个错误意味着您在使用变量 `array` 之前没有将其分配给任何值。您需要确保在使用变量之前将其赋值。您可以检查一下变量 `array` 是如何定义的,然后找出为什么它没有被赋值。或者您可以在使用 `array` 变量之前,将其赋值为一个空数组或特定值,以避免这个错误。例如:
```python
array = [] # 或者 array = [1, 2, 3] 等等
max_scalar = array.GetRange()[1]
```
这样就不会再报 UnboundLocalError 错误了。
相关问题
max_indices = max_indices[::-1][0] IndexError: invalid index to scalar variable.怎么修改
抱歉,我之前给出的代码有误。如果你想要获取最大值的最后一个索引,可以使用以下代码进行修正:
```python
import numpy as np
# 假设你的数据框名为 df,列名为 column_name
column_name = 'column_name'
max_indices = np.where(df[column_name] == np.max(df[column_name].values))[0]
# 取最后一个最大值索引
last_max_index = max_indices[-1]
```
在这个修正后的代码中,`np.where` 函数用于找到最大值在数据框中出现的所有索引。然后,我们使用 `[-1]` 来获取最后一个索引值。请确保你已经导入了 `numpy` 库。
class UserSigninLog(db.Model): """登录日志表""" bind_key = 'db2' tablename = 'user_signin_log' id = mapped_column(Integer, primary_key=True) userid = mapped_column(String(16), index=True) username = mapped_column(String(32)) ip_addr = mapped_column(String(32)) request_user_agent = mapped_column(String(256)) c_date = mapped_column(DateTime) @staticmethod def add_user_signin_log(userid: str, username: str): """新增登录日志""" user_signin_log = UserSigninLog() user_signin_log.userid = userid user_signin_log.username = username user_signin_log.ip_addr = request.access_route[0] user_signin_log.request_user_agent = request.headers.get("User-Agent") user_signin_log.c_date = datetime.now() db.session.add(user_signin_log) db.session.commit() return True @staticmethod def check_ip_and_header_within_x_days(userid: str, days=7): """检查x天内登录过的ip地址和请求头""" sql_query = select(UserSigninLog) \ .where(UserSigninLog.userid == userid, UserSigninLog.ip_addr == request.access_route[0], UserSigninLog.request_user_agent == request.headers.get("User-Agent"), UserSigninLog.c_date >= datetime.now() - timedelta(days=days)).limit(1) user_ip_addr_log = db.session.execute(sql_query).scalar_one_or_none() if user_ip_addr_log: return True return False 请帮我建议并优化这段代码,python3.8
以下是我对这段代码的建议和优化:
1. 使用 Flask 的上下文对象获取 request 对象,避免在静态方法中使用全局变量
```python
from flask import request
class UserSigninLog(db.Model):
# ...
@staticmethod
def add_user_signin_log(userid: str, username: str):
"""新增登录日志"""
user_signin_log = UserSigninLog()
user_signin_log.userid = userid
user_signin_log.username = username
user_signin_log.ip_addr = request.access_route[0]
user_signin_log.request_user_agent = request.headers.get("User-Agent")
user_signin_log.c_date = datetime.now()
db.session.add(user_signin_log)
db.session.commit()
return True
@staticmethod
def check_ip_and_header_within_x_days(userid: str, days=7):
"""检查x天内登录过的ip地址和请求头"""
user_agent = request.headers.get("User-Agent")
ip_addr = request.access_route[0]
c_date = datetime.now() - timedelta(days=days)
user_ip_addr_log = UserSigninLog.query.filter_by(userid=userid, ip_addr=ip_addr, request_user_agent=user_agent).filter(UserSigninLog.c_date >= c_date).first()
if user_ip_addr_log:
return True
return False
```
2. 使用 SQLAlchemy 的 ORM 语法查询,避免手写 SQL 语句
```python
from sqlalchemy import and_
class UserSigninLog(db.Model):
# ...
@staticmethod
def check_ip_and_header_within_x_days(userid: str, days=7):
"""检查x天内登录过的ip地址和请求头"""
user_agent = request.headers.get("User-Agent")
ip_addr = request.access_route[0]
c_date = datetime.now() - timedelta(days=days)
user_ip_addr_log = UserSigninLog.query.filter(and_(UserSigninLog.userid == userid, UserSigninLog.ip_addr == ip_addr, UserSigninLog.request_user_agent == user_agent, UserSigninLog.c_date >= c_date)).first()
if user_ip_addr_log:
return True
return False
```
3. 让静态方法更加灵活,接收 request 对象作为参数
```python
class UserSigninLog(db.Model):
# ...
@staticmethod
def add_user_signin_log(userid: str, username: str, request):
"""新增登录日志"""
user_signin_log = UserSigninLog()
user_signin_log.userid = userid
user_signin_log.username = username
user_signin_log.ip_addr = request.access_route[0]
user_signin_log.request_user_agent = request.headers.get("User-Agent")
user_signin_log.c_date = datetime.now()
db.session.add(user_signin_log)
db.session.commit()
return True
@staticmethod
def check_ip_and_header_within_x_days(userid: str, request, days=7):
"""检查x天内登录过的ip地址和请求头"""
user_agent = request.headers.get("User-Agent")
ip_addr = request.access_route[0]
c_date = datetime.now() - timedelta(days=days)
user_ip_addr_log = UserSigninLog.query.filter(and_(UserSigninLog.userid == userid, UserSigninLog.ip_addr == ip_addr, UserSigninLog.request_user_agent == user_agent, UserSigninLog.c_date >= c_date)).first()
if user_ip_addr_log:
return True
return False
```
这些是我对这段代码的建议和优化,希望能对你有所帮助。