新南威尔士大学COMP9021 QUIZ1课业解析

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题意：

巩固复习python中字典的相关知识

解析：

题目要求有4点，1补全print语句，统计mapping字典中元素的个数，2统计mapping字典中，没有值的键，存储在nonkeys列表中，3统计mapping字典中所有元素的值，存储在mapping_as_a_list列表中，4统计mapping字典中值唯一的元素，存储在one_to_one_part_of_mapping字典中。

spilt（）函数对用户输入的两个数按空格切分，arg_for_seed和upper_bound分别对应用户输入的第一和第二个数+1。

for i in range(1, upper_bound)循环表示遍历mapping字典的元素（第一个元素除外）并赋值，每次循环调用randrange（）函数在规定范围内产生一个随机数，如果是正数则把它赋值给对应的字典元素。统计字典元素个数可用len(mapping)，第二问和第三问则是对字典元素的操作，第四问则是列举一一映射的字典

涉及知识点：

python字典,列表

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pdf

QUIZ 1
COMP9021 PRINCIPLES OF PROGRAMMING
$ python3 quiz_1.py
Enter two integers: 0 4
The generated mapping is:
{3: 1}
The mappings's so-called "keys" make up a set whose number of elements is 1.
The list of integers between 1 and 4 that are not keys of the mapping is:
[1, 2, 4]
Represented as a list, the mapping is:
[None, None, None, 1, None]
The one-to-one part of the mapping is:
{3: 1}
$ python3 quiz_1.py
Enter two integers: 0 8
The generated mapping is:
{2: 4, 3: 8, 4: 7, 5: 7}
The mappings's so-called "keys" make up a set whose number of elements is 4.
The list of integers between 1 and 8 that are not keys of the mapping is:
[1, 6, 7, 8]
Represented as a list, the mapping is:
[None, None, 4, 8, 7, 7, None, None, None]
The one-to-one part of the mapping is:
{2: 4, 3: 8}
Date: Term 3, 2019.


$ python3 quiz_1.py
Enter two integers: 10 10
The generated mapping is:
{1: 8, 2: 8, 3: 8, 4: 10, 7: 10, 8: 9}
The mappings's so-called "keys" make up a set whose number of elements is 6.
The list of integers between 1 and 10 that are not keys of the mapping is:
[5, 6, 9, 10]
Represented as a list, the mapping is:
[None, 8, 8, 8, 10, None, None, 10, 9, None, None]
The one-to-one part of the mapping is:
{8: 9}
$ python3 quiz_1.py
Enter two integers: 5 15
The generated mapping is:
{1: 10, 3: 7, 8: 13, 9: 10, 10: 7, 11: 15, 12: 3, 13: 2}
The mappings's so-called "keys" make up a set whose number of elements is 8.
The list of integers between 1 and 15 that are not keys of the mapping is:
[2, 4, 5, 6, 7, 14, 15]
Represented as a list, the mapping is:
[None, 10, None, 7, None, None, None, None, 13, 10, 7, 15, 3, 2, None, None]
The one-to-one part of the mapping is:
{8: 13, 11: 15, 12: 3, 13: 2}
$ python3 quiz_1.py
Enter two integers: 23 16
The generated mapping is:
{1: 13, 2: 3, 3: 9, 9: 12, 10: 12, 12: 13, 13: 15, 15: 16, 16: 13}
The mappings's so-called "keys" make up a set whose number of elements is 9.
The list of integers between 1 and 16 that are not keys of the mapping is:
[4, 5, 6, 7, 8, 11, 14]
Represented as a list, the mapping is:
[None, 13, 3, 9, None, None, None, None, None, 12, 12, None, 13, 15, None, 16, 13]
The one-to-one part of the mapping is:
{2: 3, 3: 9, 13: 15, 15: 16}