Python 为什么调用我的类来让我的类工作时需要两个arg？

我正在Windows10上运行Python 3.3.4

以下是我的班级代码-

class Curl():

    def __init__(self):
        self.file7 = file7
        self.Days1 = Days1

    def readfile(self):
        ticknum = 0
        read_ticker = []
        ins = open(file7, "r" )
        for line in ins:
            if line.endswith('\n'):
                line=line[:-1]
            read_ticker.append(line)
            ticknum =+1
        ins.close()
        return read_ticker

    def CalcDates(self, Days1):  # Determine dates
        calculated_dates = dict()
        Run_Time = (time.strftime("%H/%M/%S"))
        calculated_dates['Run_Time']= Run_Time
        Today = date.today()
        calculated_dates['Today'] = Today
        End_Date = (Today - timedelta(days=Days1)) 
        calculated_dates ['Start_Date'] = Today
        Start_Day = str(Today.strftime("%d")) 
        calculated_dates['Start_Day'] = Start_Day
        Start_Month = str(Today.strftime("%m")) 
        calculated_dates['Start_Month'] = Start_Month
        Start_Year = str(Today.strftime("%Y")) 
        calculated_dates['Start_Year']= Start_Year
        End_Day = str(End_Date.strftime("%d"))
        calculated_dates['End_Day'] = End_Day
        End_Month = str(End_Date.strftime("%m"))
        calculated_dates['End_Month']= End_Month
        End_Year = str(End_Date.strftime("%Y"))
        calculated_dates['End_Year']= End_Year
        return calculated_dates

如果我执行以下操作，它将运行：

file7 = 'C:\\...\\file1.txt'
fileList = Curl.readfile(file7)
print('readTickers is complete')
print(fileList)
D1 = Curl.CalcDates( 90, 90)
print(D1)

我希望它运行，如果我改变了D1行如下； D1=旋度计算值（90）

但它没有-我得到以下错误

Traceback (most recent call last):
File "C:\Users\Edge\Desktop\readTICKR class432.py", line 56, in <module>
D1 = Curl.CalcDates(90)
TypeError: CalcDates() missing 1 required positional argument: 'Days1'

回溯（最近一次呼叫最后一次）：
文件“C:\Users\Edge\Desktop\readTICKR class432.py”，第56行，在
D1=旋度计算值（90）
TypeError:CalcDates（）缺少1个必需的位置参数：“Days1”

为什么在调用Curl.CalcDates时需要进行双重论证？

---

如何修复它以便使用单个参数？

原因是

CalcDates

是一个实例方法，因此需要首先创建

Curl

对象

D1 = Curl(file7, Days1).CalcDates(90)

您还需要修复

\uuuuu init\uuuu

函数

def __init__(self, file7, Days1):
    self.file7 = file7
    self.Days1 = Days1