悉尼大学INFO1110/COMP9001课业解析

题意：
使用python编写一个账单管理系统

解析：
用Python编写应用程序，该程序能够记录用户的收入和支出，能够显示余额的变化，用户能够指定时间设定收入与支出。
程序需要从文件中读取信息当作起始条件，随后根据指令进行操作：
trancaction：当用户输入该指令后，提示用户输入交易涉及多少钱，正数为收入，负数为支出，然后反应在余额中。
next：进入第二天。但如果用户余额低于0，则打印“你欠债了”，程序结束；否则，程序应该打印到第二天，开始新的一天。
status：显示到目前的情况汇总，而且回根据当前金额与起始金额与用户互动。
regular：用户能够指定一些常规的收入或者指出信息。
help：显示提示信息，提示用户指令的操作
quit：退出程序。
这是一个字符串处理的问题，当用户输出的字符串和指令相匹配则执行相应的操作，如果不是上述的所有指令则打印提示信息。

涉及知识点：
文件读写、字符串处理、数组
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INFO1110 / COMP9001 Assignment 1
Money Tracker
Deadline: 23rd Sept 2019, 11:59pm AEST (Week 8, Monday)
Weighting: 10% of the final assessment mark
Overview
Brief Description
You will write a program that allows the user to manage their finances. The program will be able
to record the user’s incomes and expenses, display how their balance has changed, etc. It will also
need to be able to handle regular incomes and expenses; for example, the user will be able to
specify that they have a $100 income every Sunday, or that they spend $40.50 every Thursday.
Implementation details
Your program will be written in Python 3. The only modules you may import are sys and the
function.py file which you will write yourself.
Submission
You will submit your code on the assignment page on Ed. To make a submission, you will need to
press the “Mark” button. You may submit as many times as you wish without penalty - we will
mark the last submission that you make. After each submission, the marking system will
automatically check your code against the public test cases.
Please ensure you carefully follow the assignment specification. Your program output must
exactly match the output shown in the examples.
Warning: Any attempts to deceive or disrupt the marking system will result in an immediate zero
for the entire assignment. Negative marks can be assigned if you do not properly follow the
assignment specifications, or your code is unnecessarily or deliberately obfuscated.
Help and feedback
You are encouraged to ask questions about the assignment during the Helpdesk and on the Ed
discussion board; however, remember that you should not be posting any assignment code
publicly, as this would constitute academic dishonesty.
The Program
Starting the Program
The program will be given 1 extra command line argument when it is run:
$ python3 tracker.py (filename)
This (filename)will specify a file with information about regular incomes and expenses; see the
section on Regular Transactions for more information (it is recommended that you implement
this feature last).
After handling this file, the program will ask the user for their starting balance, like so:
Starting balance: $
The user will then fill out this field with their initial balance, for example:
Starting balance: $4.11
—If the starting value cannot be converted to a float, the program should print Error:
Cannot convert to float! and quit immediately
Starting balance: $cat
Error: Cannot convert to float!
—If the starting value is negative or zero, the program should print Error: Must start with
positive balance! and quit immediately.
Starting balance: $-5
Error: Must start with positive balance!
Once we have the regular payments and initial balance set up, we’re good to go! The program
should now continually ask for input, like so:
Enter command:
Depending on what the user enters, the program will record new transactions, show some
statistics, etc. For example, if the user types transaction …
Enter command: transaction
…then the transaction operation (explained below) should execute. The program should
continue asking for more inputs indefinitely, and execute the appropriate code each time.
Operations

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