In C language, for example,
typedef struct People_S
{
int age;
int grade;
}People;
People tmp[10] = {0};
Then I can use tmp[0].grade to access the data.
In Python, however, I have no ideal how to do it. If using list tmp = [[10,60],[11,50]], i can get the grade by tmp[0][1]. But too much magic number is not good for reading.
Thanks for your helf!
Another option besides classes or dictionaries is namedtuple:
>>> from collections import namedtuple
>>> People = namedtuple('People','age grade')
>>> People(10,60)
People(age=10, grade=60)
>>> p = People(10,60)
>>> p.age
10
>>> p.grade
60
A way to populate a People list:
>>> tmp = [[10,60],[11,50]]
>>> p = [People(age,grade) for age,grade in tmp]
>>> p
[People(age=10, grade=60), People(age=11, grade=50)]
namedtuples are classes, they're just ones that Python generates for you (that subclass tuple to provide immutability guarantees and interoperability). Also note that as of 3.5, there is typing.NamedTuple, a replacement for collections.namedtuple which allows for safe typing, and added more flexibility as well in 3.6, which in turn paved the way for 3.7's dataclasses module, which provides maximally flexible class generation capabilities.If you are fine with using iteration on a list, you could as well use dictionaries if you do not like full fledged classes:
dictList = []
for i in range(5):
dictList.append({"age":i+10,"grade": i//3})
print(dictList)
print( dictList[2]["grade"], dictList[2]["age"] )
for e in dictList:
print(e)
Output:
[{'grade': 0, 'age': 10}, {'grade': 0, 'age': 11}, {'grade': 0, 'age': 12},
{'grade': 1, 'age': 13}, {'grade': 1, 'age': 14}]
(0, 12)
{'age': 10, 'grade': 0}
{'age': 11, 'grade': 0}
{'age': 12, 'grade': 0}
{'age': 13, 'grade': 1}
{'age': 14, 'grade': 1}
Or the previously mentioned classes (see PyTut: A first look at classes):
class People:
def __init__(self,age,grade):
self.age=age
self.grade=grade
def __str__(self):
return f"Age {self.age} Grade {self.grade}"
classList = []
for i in range(5):
classList.append( People(i+10,i//3))
print(*classList,sep="\n")
Output:
Age 10 Grade 0
Age 11 Grade 0
Age 12 Grade 0
Age 13 Grade 1
Age 14 Grade 1
class Person:\n def __init__(self, age, grade):self.age,self.grade = age,grade