Python，向類中添加方法，錯誤：全局名稱未定義

Question

我想了解爲什麼我的方法increment4無法正常工作。所有這些方法都可以很好地作爲函數，但現在我已經將它們轉換成了一些不起作用的方法。我用「自己」替換了「時間」對象名稱。我嘗試保留並刪除「返回」。 編輯我沒有使用點符號，正如我所指出的那樣。我做了一些改變。現在，Python是給我一個不同的錯誤：33

Traceback (most recent call last): 
    File "/Users//Desktop/temp.py", line 33, in <module> 
    currenttime.increment4(4000) 
    File "/Users//Desktop/temp.py", line 22, in increment4 
    newtime = float(total_seconds).make_time() 
AttributeError: 'float' object has no attribute 'make_time' 
>>> 

線路是：

currenttime.increment4(4000) 

線22：

newtime = float(total_seconds).make_time() 

這裏是整個事情：

class Time: 
    def printTime(self): 
     print str(time.hours)+":"+str(time.minutes)+":"+str(time.seconds) 

    def make_time (self): 
     time = Time() 
     time.hours = self/3600 
     time.minutes = (self % 3600)/60 
     time.seconds = (self % 3600) % 60 
     return time 

    def covertTOseconds (self): 
     hours = self.hours * 3600 
     minutes = self.minutes * 60 
     seconds = self.seconds 
     amt_in_seconds = hours + minutes + seconds 
     return amt_in_seconds 

    def increment4 (self, increaseINseconds): 
     total_seconds = self.covertTOseconds() + increaseINseconds 
     newtime = float(total_seconds).make_time() 
     newtime.printTime() 


currenttime = Time() 
currenttime.hours = 3 
currenttime.minutes = 47 
currenttime.seconds = 45 



currenttime.increment4(4000) 

Answer 1

您需要稍微修改一下代碼：

class Time: 
    def printTime(self, time): 
     print str(time.hours)+":"+str(time.minutes)+":"+str(time.seconds) 

    def increment4(self, increaseINseconds): 
     seconds = self.covertTOseconds() + increaseINseconds 
     time = self.makeTime (seconds) 
     print time 

    def makeTime(self, totalseconds): 
     time = Time() 
     time.hours = totalseconds/3600 
     time.minutes = (totalseconds % 3600)/60 
     time.seconds = (totalseconds % 3600) % 60 
     return time 

    def covertTOseconds(self): 
     hours = self.hours * 3600 
     minutes = self.minutes * 60 
     seconds = self.seconds 
     totalseconds = hours + minutes + seconds 
     return totalseconds 

由於錯誤顯示converTOseconds沒有定義，因爲它應該self被調用，也它不帶任何參數。因此，您需要將covertTOseconds (self)更改爲self.convertTOseconds()。希望這可以幫助。

既然你已經更新的問題，在我看來，那是你可能想要做的是有這樣一個類：

class Time: 
    def __init__(self): 
     self.hours = None 
     self.minutes = None 
     self.seconds = None 
     self.total_seconds = None 

    def to_seconds(self): 
     hours = self.hours * 3600 
     return (self.hours * 3600) + (self.minutes * 60) + self.seconds 

    def increment(self, x): 
     self.total_seconds = self.to_seconds() + x 
     self.hours = self.total_seconds/3600 
     self.minutes = (self.total_seconds % 3600)/60 
     self.seconds = (self.total_seconds % 3600) % 60 
     self.__str__() 

    def __str__(self): 
     print("{0}:{1}:{2}".format(self.hours, self.minutes, self.seconds)) 

然後你可以使用這個類，如下所示：

c_time = Time() 
c_time.hours = 3 
c_time.minutes = 47 
c_time.seconds = 45 

c_time.increment(4000) 

此輸出：

4:54:25