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<pre><code>class Date:
def __init__(self, digits): #digits='10/20/21'
self.month = digits[:2] #'10'
self.day = digits[3:5] #'20'
self.year = digits[6:8] #'21'
def __str__(self):
return f"Dated this {self.day} day of {self.month}, 20{self.year}"
def checkday(date): #add 'st', 'nd', 'rd', or 'th' to day
if int(date.day) == 1 or int(date.day) == 21 or int(date.day) == 31:
date.day += 'st'
elif int(date.day) == 2 or int(date.day) == 22:
date.day += 'nd'
elif int(date.day) == 3 or int(date.day) == 23:
date.day += 'rd'
else:
date.day += 'th'
def checkmonth(date): #get name of month
date.month = monthdic[date.month]
months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'June', 'Jul', 'Aug', 'Sep', 'Oct','Nov', 'Dec']
monthdic = {str(i): month for i, month in zip(range(1,13), months)}
date = Date(input("Enter date (mm/dd/yy):\t"))
checkday(date)
checkmonth(date)
print(date)
</code></pre>
<p>几个错误归结为一个我没有想到的问题:</p>
<p>如果是一月:<code>1/12/14</code>将不起作用,因为<code>self.month</code>是<code>1/12/14[:2]</code></p>
<pre><code>Enter date (mm/dd/yy): 1/12/14
Traceback (most recent call last):
File "date.py", line 38, in <module>
checkday(date)
File "date.py", line 14, in checkday
if int(date.day) == 1 or int(date.day) == 21 or int(date.day) == 31:
ValueError: invalid literal for int() with base 10: '2/'
</code></pre>
<p>如果我求助于<code>01/12/14</code>,这也将不起作用,因为<code>01</code>是<code>'01'</code>,并且<code>monthdic['01']</code>不存在:</p>
<pre><code>Enter date (mm/dd/yy): 01/12/14
Traceback (most recent call last):
File "date.py", line 39, in <module>
checkmonth(date)
File "date.py", line 28, in checkmonth
date.month = monthdic[date.month]
KeyError: '01'
</code></pre>
<p>显然</p>
<pre><code>def __init__(self, digits):
self.month = digits[:2]
self.day = digits[3:5]
self.year = digits[6:8]
</code></pre>
<p>不是最好的方法,有哪些好的方法(regex除外)</p>
<p>还有一件事:在<code>__init__</code>内调用<code>checkdate()</code>和<code>checkmonth</code>是否合适</p>