TypeError: 'Column' object is not callable
时间: 2023-08-27 21:14:29 浏览: 276
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相关问题
sqlalchemy中进行entity定义时,应该怎么定义才不会TypeError: ‘Column’ object is not callable这种报错
在SQLAlchemy中,当你尝试像函数那样调用`Column`对象而不是设置其属性时,可能会遇到`TypeError: 'Column' object is not callable`的错误。`Column`实际上是一个描述数据库表列的数据模型,它不是用来直接执行操作的。
当你在定义Entity(实体)时,`Column`通常用于定义表结构,例如:
```python
from sqlalchemy import Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base
Base = declarative_base()
class User(Base):
__tablename__ = 'users'
id = Column(Integer, primary_key=True) # id列,整数类型,为主键
name = Column(String(50)) # name列,字符串类型,最大长度为50
email = Column(String(120), unique=True) # email列,字符串类型,唯一
# 正确的方式是通过Column实例来设置表的字段属性,而不是像调用函数那样使用
```
确保你在定义Entity时,正确地设置了列名、数据类型以及所需的约束条件,并且不要试图直接调用`Column`作为函数。如果你试图对列做某种处理(如计算等),那应该是在对应的模型方法里完成,而不是直接在`Column`上。
TypeError: 'DataFrame' object is not callable
This error occurs when you try to call a DataFrame object like a function, but it is not callable.
For example, let's say you have a DataFrame called `df` and you want to extract a column called "name". If you try to call `df("name")`, you will get the TypeError: 'DataFrame' object is not callable error.
The correct way to extract a column from a DataFrame is using square brackets like this: `df["name"]`.
Make sure you are using the correct syntax when working with DataFrames to avoid this error.
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