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I would like to iterate over a dictionary of objects in an attribute sorted way
import operator class Student: def __init__(self, name, grade, age): self.name = name self.grade = grade self.age = age studi1 = Student('john', 'A', 15) studi2 = Student('dave', 'B', 10) studi3 = Student('jane', 'B', 12) student_Dict = {} student_Dict[studi1.name] = studi1 student_Dict[studi2.name] = studi2 student_Dict[studi3.name] = studi3 for key in (sorted(student_Dict, key=operator.attrgetter('age'))): print(key) This gives me the error message: AttributeError: 'str' object has no attribute 'age'
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First, we use the sorted() function to order the values of the dictionary. We then loop through the sorted values, finding the keys for each value. We add these keys-value pairs in the sorted order into a new dictionary. Note: Sorting does not allow you to re-order the dictionary in-place.
Older PythonIt is not possible to sort a dictionary, only to get a representation of a dictionary that is sorted. Dictionaries are inherently orderless, but other types, such as lists and tuples, are not. So you need an ordered data type to represent sorted values, which will be a list—probably a list of tuples.
Use dict. items() to get a list of tuple pairs from d and sort it using a lambda function and sorted(). Use dict() to convert the sorted list back to a dictionary. Use the reverse parameter in sorted() to sort the dictionary in reverse order, based on the second argument.
for student in (sorted(student_Dict.values(), key=operator.attrgetter('age'))): print(student.name) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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