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[英]python format string TypeError: not all arguments converted during string formatting
[英]Python3 “TypeError: not all arguments converted during string formatting”
我正在使用Flask SQLAlchemy模型為我的應用程序創建數據庫,我正在嘗試使用models.Posts.query.all()查詢數據庫這是我的模型:
class Posts(db.Model):
post_id = db.Column(db.Integer, primary_key=True)
title = db.Column(db.String(500), index=True)
date = db.Column(db.Date)
image = db.Column(db.String(500))
post_body = db.column(db.String(10000),index=True)
authors = db.relationship('Users', backref='authors', lazy='dynamic')
def __repr__(self):
return '' % (self.post_id, self.title, self.date, self.image)
這是我收到的錯誤消息:
>>> models.Posts.query.all()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Users/lisa-jd/Blog_platform/app/models.py", line 30, in __repr__
image = db.Column(db.String(50))
TypeError: not all arguments converted during string formatting
任何幫助將非常感激。
錯誤消息是bitcryptic但提供了一個提示:
File "/Users/lisa-jd/Blog_platform/app/models.py", line 30, in __repr__
你的__repr__
函數:
def __repr__(self):
return '' % (self.post_id, self.title, self.date, self.image)
如果被調用,觸發臭名昭着的消息就像這個簡單的例子所示:
>>> "" % 10
Traceback (most recent call last):
File "<string>", line 301, in runcode
File "<interactive input>", line 1, in <module>
TypeError: not all arguments converted during string formatting
你將3個參數傳遞給空格式字符串。 也許你的意思是:
def __repr__(self):
return '%s: %s %s' % (self.post_id, self.title, self.date, self.image)
或者使用str.format
def __repr__(self):
return '{}: {} {}'.format(self.post_id, self.title, self.date, self.image)
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