class Course(object):
def __init__(self,cnum,name):
self.name = name
self.cnum = cnum
def __str__(self):
return 'Course:' , self.cnum , self.name
class AssigendCourse(Course):
def __init__(self,Course,dept,year,semester):
self.name = Course.name
self.cnum = Course.cnum
if dept == 'SE' or dept == 'CE' or dept == 'CIE' or dept == 'ME':
self.dept = dept
else:
self.dept = None
if year >= 1 and year <= 4:
self.year = year
else:
self.year = None
if semester >= 1 and semester <= 3:
self.semester = semester
else:
self.semester = None
def __str__(self):
return 'Course: ' , self.name , self.cnum
导致这种类型的错误
TypeError: __str__ returned non-string (type tuple)
我无法确定我需要使用哪种类型的语法来为 __str__ func使用时获取对象的打印：
it = iter(db)
for i in it:
print(i)
1 回答
您的
__str__方法返回 tuples ：逗号使它成为元组 .
你需要加入这些 Value 观;我建议字符串格式化：