Customization

Requirements:

• Customize a class of timer
• Function with ‘start’ and ‘stop’ methods
• t1 and print(t1) -> Result
• When the timer is stopped or yet not started, call the relevant method for tips.
• Timer can add together.
• Limited bank.

Bank

• localtime in time module
• time.localtime -> format of struct_time
• rewrite of __str__ , __repr__

Expanded Reading: time module

Code

import time as t

class MyTimer():
    # rewrite the __init__
    def __init__(self):
        self.unit = ['year', 'month', 'day', 'hour', 'minute', 'second']
        self.prompt = "Timer has not started."
        self.lasted = []
        # avoid the attribute the same name with method
        self.begin = 0
        self.end = 0
        
    # rewrite the magic methods
    def __str__(self):
        return self.prompt

    __repr__ = __str__

    # realize the add
    def __add__(self, other):
        prompt = "The all runtime is "
        result = []
        for index in range(6):
            result.append(self.lasted[index] + other.lasted[index])
            if result[index]:
                prompt += (str(result[index]) + self.unit[index])
    
    # start timer
    def start(self):
        self.begin = t.localtime()
        self.prompt = "Pls call the stop first!"
        print("Timer is on.")

    # stop timer
    def stop(self):
        if not self.begin:
            print("Pls call the start first")
        else:
            self.end = t.localtime()
            self._calc()
            print("Timer is off.")

    # calculate the runtime, method inside(started with ).
    def _calc(self):
        self.lasted = []
        self.prompt = "Runtime of timer is "
        for index in range(6):
            self.lasted.append(self.end[index] - self.begin[index])
            if self.lasted[index]:
                self.prompt += (str(self.lasted[index]) + self.unit[index])

        # Initialize again
        self.begin = 0
        self.end = 0

Result:

>>> t1 = MyTimer()
>>> t1
Timer has not started.
>>> t1.start()
Timer is on.
>>> t1
Pls call the stop first!
>>> t1.stop()
Timer is off.
>>> t1
Runtime of timer is 6second
>>> print(t1)
Runtime of timer is 6second

Advanced Customization

The code before have some problem.

• The precision of timer is second. We can use the other bank to be advanced.
• The calculation of the timer will be -1.

Code New:

• To Be Continue