Call a class with append that targets class variable

For example: class Foo: def __init__(self): self.bar = [“baz”, “qux”, “quux”, “quuz”, “corge”, “grault”, “garply”, “waldo”, “fred”, “plugh”, “xyzzy”, “thud”] How can I call Foo().append() that appends to Foo().bar? Ex: x = Foo() x.append(“asd”) # What I want to happen: # self.bar now is […, “asd”] # What actually happens: # AttributeError: ‘Foo’ object has…

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ERROR TypeError: Cannot convert undefined or null to object ejs-treegrid

In Angular application, I am unable to read from the service I created using [dataSource]. ERROR TypeError: Cannot convert undefined or null to object ERROR TypeError: Cannot read property ‘getService’ of undefined component.ts import { Component, OnInit } from ‘@angular/core’; import { RailroadAgreementService } from ‘../../services/railroad-agreement.service’; import { RRA_ID } from ‘../../models/RRA_ID’; @Component({ selector: ‘app-railroad-agreements’,…

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