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__str__ from my own matrix, python


__str__ from my own matrix, python

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__str__ from my own matrix, python
Tag : python , By : Mahyar Sepehr
Date : November 24 2020, 03:01 PM

this will help You can do this using the str.join method. The inner loop converts row items to string and joins them with the empty string as the separator, the outer loop joins the row strings with newlines.
class Test:
    def fill(self, rows, cols, val):
        self.matrixRC = [[val] * cols for _ in range(rows)]

    def __str__(self):
        return '\n'.join(''.join(map(str, row)) for row in self.matrixRC)

t = Test()
t.fill(5, 3, 2)
print(t)
222
222
222
222
222
'\n'.join(' | '.join(map(str, row)) for row in self.matrixRC)   
2 | 2 | 2
2 | 2 | 2
2 | 2 | 2
2 | 2 | 2
2 | 2 | 2
def __str__(self):
    return '\n'.join([''.join([str(u) for u in row]) for row in self.matrixRC])
def __str__(self):
    out = []
    for row in self.matrixRC:
        out.append(''.join([str(u) for u in row]))
    return '\n'.join(out)

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Python - Why does __str__ want something returned when it called? I have print functions inside of __str__


Tag : python , By : Ricardo
Date : March 29 2020, 07:55 AM
hop of those help? As per the __str__ docs,
def __str__(self):
    return "Vehicle Type: {}\nMake: {}\nModel: {}\nYear: {}\nMiles: {}" \
        .format(self.typ, self.make, self.model, self.year, self.miles)

Django __str__ returned non-string (type tuple), i didn't define __str__


Tag : python , By : kraszie
Date : March 29 2020, 07:55 AM
hop of those help? Look for a stray comma at the end of any __str__ definitions that you did write.
Returning a value with a comma at the end will turn your value into a tuple containing that value.

Cannot make custom __str__ calling parent's __str__ in Django


Tag : django , By : niel
Date : March 29 2020, 07:55 AM
seems to work fine Ok, I managed to know what was happening. It was because of the decorator python_2_unicode_compatible (from django.utils.encoding import python_2_unicode_compatible). Here's the traceback where problem starts:
/my/path/to/django/utils/six in <lambda>(self)
    840                              klass.__name__)
    841         klass.__unicode__ = klass.__str__
--> 842         klass.__str__ = lambda self: self.__unicode__().encode('utf-8')
    843     return klass
    844
def str(self):
    return "foo"

def __str__(self):
    return self.str()

how to activate __str__ dunder method using instance and fix error:"__str__ returned non-string (type NoneType)&quo


Tag : python , By : fayoh
Date : March 29 2020, 07:55 AM
hop of those help? As the error says, you need to return the new string representation of the class instance you created in the overriden __str__ dunder method.
def __str__(self):
    self.great_dev=math.gcd(self.p,self.q)
    self.p=self.p/self.great_dev
    self.q=self.q/self.great_dev
    # return the updated string representation
    return "{self.p}/{self.q}".format(self=self)

how to use __str__ with foreign key '__str__ returned non-string (type Product)'


Tag : python , By : Imran
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , You can not return something other than a string from the __str__ method. self.product is not a string, but a Product object.
You can however call str(..) over it, to get the textual representation of that Product:
class ProductOrder(models.Model):
    product = models.ForeignKey(Product, on_delete=models.CASCADE, null=True)
    ordering = models.ForeignKey(Order, on_delete=models.CASCADE,blank=True,null=True)

    def __str__(self):
        return str(self.product)
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