无法从 class 打印 __str__

Question

I wondered how can I print the class contents of a particular index. I made a class that has all the values of a certain seismic movement and stores each in its own data type.

Here is the class:

import re

class Txt_data:
       
    def __init__(self, result):
    
        self.date = result[0]
        self.time = result[1]
        self.latit = result[2]
        self.long = result[3]
        self.depth = result[4]
        self.md = result[5]
        self.ml = result[6]
        self.mw = result[7]
        self.region = result[8]
        self.method = result[9]    
  
    def date(self):
        return self._date

  
    def time(self):
        return self._time

  
    def latit(self):
        return self._latit

  
    def long(self):
        return self._long

  
    def depth(self):
        return self._depth

  
    def md(self):
        return self._md

  
    def ml(self):
        return self._ml

  
    def mw(self):
        return self._mw

  
    def region(self):
        return self._region

  
    def method(self):
        return self._method        

    # This does not work 
    def __str__(self):
        return ('MAG: ' + float(self.ml()) + ' DEPTH: ' + int(self.region()) + ' DATE/TIME: ' + str(self.date()) + ' ' + str(self.time()) + ' LAT: ' + float(self.latit()) + ' LON: ' + float(self.long()))

result = [('2021.12.02', '22:29:24', '36.9605', '28.1775', '13.0', '-.-', '1.5', '-.-', 'KARACA-MARMARIS (MUGLA)', ' Quick')]


print(Txt_data(result))

I was trying to print the data using str method but it doesn't work.

Here is the error:

Traceback (most recent call last):
  File "/Users/seyfalsultanov/Documents/uni comp 100/comp100-2021f-ps5-seyfalku/main.py", line 73, in <module>
    print(Txt_data(result))
  File "/Users/seyfalsultanov/Documents/uni comp 100/comp100-2021f-ps5-seyfalku/main.py", line 60, in __str__
    print('MAG: ' + float(self.ml()) + ' DEPTH: ' + int(self.region()) + ' DATE/TIME: ' + str(self.date()) + ' ' + str(self.time()) + ' LAT: ' + float(self.latit()) + ' LON: ' + float(self.long()))
AttributeError: Txt_data instance has no __call__ method

My question is how to print the string i tried to print using str method in the class. Thanks very much beforehand.

Answer 1

Your immediate problem is that you shadowed all your methods with instance attributes, instead of using _ -prefixed names for the attributes that the method expect.

def __init__(self, result):

    self._date = result[0]
    self._time = result[1]
    self._latit = result[2]
    self._long = result[3]
    self._depth = result[4]
    self._md = result[5]
    self._ml = result[6]
    self._mw = result[7]
    self._region = result[8]
    self._method = result[9]    

However, none of those getters are necessary; just use the instance attributes directly. In __str__ , use an f-string to perform any necessary type conversions (which you are currently doing wrong; non- str values need to be converted to str values, not the other way around).

class Txt_data:
       
    def __init__(self, result):
    
        self.date = result[0]
        self.time = result[1]
        self.latit = result[2]
        self.long = result[3]
        self.depth = result[4]
        self.md = result[5]
        self.ml = result[6]
        self.mw = result[7]
        self.region = result[8]
        self.method = result[9]    
  
    def __str__(self):
        return f'MAG: {self.ml} DEPTH: {self.region} DATE/TIME: {self.date} {self.time} LAT: {self.latit} LON: {self.long}'



result = ('2021.12.02', '22:29:24', '36.9605', '28.1775', '13.0', '-.-', '1.5', '-.-', 'KARACA-MARMARIS (MUGLA)', ' Quick')
print(Txt_data(result))

---

Finally, I would recommend making __init__ not be responsible for splitting up a list. Have it simply take 10 different arguments, and use a dedicated class method to parse a list in a fixed format.

class Txt_data:
       
    def __init__(self, date, time, latitude, long, depth, md, ml, mw, region, method):
    
        self.date = date
        self.time = time
        self.latit = latit
        self.long = long
        self.depth = depth
        self.md = md
        self.ml = ml
        self.mw = mw
        self.region = region
        self.method = method

    @classmethod
    def from_list(cls, x):
        if len(x) != 10:
            raise ValueError("Wrong number of elements in list")
        return cls(*x)
  
    def __str__(self):
        return f'MAG: {self.ml} DEPTH: {self.region} DATE/TIME: {self.date} {self.time} LAT: {self.latit} LON: {self.long}'

Answer 2

I dont know why u created all these methods individualy but i found that your self variables have the exact same name as your functions does, so change your self variables name(also remeber to change the variables name where u have returned each of them and remove the dashes from the beginning), remove the '()' from the result list, also remove the 'float()' and 'int()' from the final return from the class and replace them with 'str()'

import re

class Txt_data:
       
    def __init__(self, result):
    
        self.date1 = result[0]
        self.time1 = result[1]
        self.latit1 = result[2]
        self.long1 = result[3]
        self.depth1 = result[4]
        self.md1 = result[5]
        self.ml1 = result[6]
        self.mw1 = result[7]
        self.region1 = result[8]
        self.method1 = result[9]    
  
    def date(self):
        return self.date1

  
    def time(self):
        return self.time1

  
    def latit(self):
        return self.latit1

  
    def long(self):
        return self.long1

  
    def depth(self):
        return self.depth1

  
    def md(self):
        return self.md1

  
    def ml(self):
        return self.ml1

  
    def mw(self):
        return self.mw1

  
    def region(self):
        return self.region1

  
    def method(self):
        return self.method1     

    def __str__(self):
        return ('MAG: ' + str(self.ml()) + ' DEPTH: ' + str(self.region()) + ' DATE/TIME: ' + str(self.date()) + ' ' + str(self.time()) + ' LAT: ' + str(self.latit()) + ' LON: ' + str(self.long()))

result = ['2021.12.02', '22:29:24', '36.9605', '28.1775', '13.0', '-.-', '1.5', '-.-', 'KARACA-MARMARIS (MUGLA)', ' Quick']


print(Txt_data(result))

I have corrected your code and this should be like this.