How can I execute my function to strings like this: `string.func()` [duplicate]

Question

Lets supose I have a function that makes add bigger spaces to my text.

def bigger_spaces(text):
    text = list(text)
    print(' '.join(text))

To execute it, i need to do bigger_spaces(my_text). how can I execute like this:

my_text.bigger_spaces()

I know I can make a class but then I have to add the string to that class first

I'd probably subclass str and then make text an instance of that class, rather than modifying the built-in str class. — David Zemens
– David Zemens, Commented Aug 4, 2019 at 17:21
Note that while it's considered a reasonable practice (in some quarters, not by any means all) to extend classes that shipped with the standard library in Ruby, that is not at all considered a responsible thing to do in Python... arguably more on account of cultural issues than actual runtime differences (there's a lot more appreciation for readability, predictability, maintainability, etc in the Python world). — Charles Duffy
– Charles Duffy, Commented Aug 4, 2019 at 17:23
create a class that has a function "bigger_spaces()" and a text as one property of that class then create object "my_text" as an instance of that class. — Mohamed Ibrahim
– Mohamed Ibrahim, Commented Aug 4, 2019 at 17:24
@rafa_rrayes, just because the other instance got an answer you don't like doesn't mean it wasn't the same question being asked. The answer is "no, you can't" -- intentionally so; in the Python world, we consider this kind of practice to be dangerous, inasfar as monkeypatching makes it harder to understand what code does on a read (increasing the amount of context that needs to be read and understood), even when it's putatively interacting only with built-in types. — Charles Duffy
– Charles Duffy, Commented Aug 4, 2019 at 17:31
Also Python isn't designed to support adding methods to built-in classes, and trying to brute-force it is a recipe for weird segfaults and memory corruption. — user2357112
– user2357112, Commented Aug 4, 2019 at 17:34

PythonProgrammi · Accepted Answer · 2019-08-04 19:41:52Z

1

class MyString:
    def __init__(self, string):
        self.string = string
    def bigger_string(self):
        print(' '.join(self.string))

mystring = MyString("this is the string")
mystring.bigger_string()

output

t h i s   i s   t h e   s t r i n g

Dataclass in Python 3.7

from dataclasses import dataclass

@dataclass
class St:

    text : str

    def bigger(self) -> None:
        self.text = list(self.text)
        print(" ".join(self.text))

mys = St("Hello")
mys.bigger()

output

H e l l o

edited Aug 4, 2019 at 19:41

answered Aug 4, 2019 at 17:31

PythonProgrammi

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1 Comment

Charles Duffy Over a year ago

Consider adding this answer on the canonical instance of the question, rather than here; that way, it's going to get a wider audience, and we avoid having folks' attention spread across multiple instances of the question where it could be focused on just one.

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