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How do I remove code duplication between similar const and non-const member functions?
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@VioletGiraffe we know that the object wasn't originally created const, as it is a non-const member of a non const object, which we know because we are in a non-const method of said object. The compiler doesn't make this inference, it follows a...
Finding the source code for built-in Python functions?
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would have been helpful if you had given an example of how to use __file__
– stackoverflowpro
Aug 25 at 8:59
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Merging objects (associative arrays)
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Now in 2016 I would say the best/standard way is Object.assign()
Pure Javascript. No jQuery is needed.
obj1 = {a: 1, b: 2};
obj2 = {a: 4, c: 110};
obj3 = Object.assign({},obj1, obj2); // Object {a: 4, b: 2, c: 110}
More i...
How do I filter ForeignKey choices in a Django ModelForm?
...et to the field's queryset attribute. Depends on how your form is built. If you build an explicit form, you'll have fields named directly.
form.rate.queryset = Rate.objects.filter(company_id=the_company.id)
If you take the default ModelForm object, form.fields["rate"].queryset = ...
This is d...
Lazy Method for Reading Big File in Python?
...1k."""
while True:
data = file_object.read(chunk_size)
if not data:
break
yield data
with open('really_big_file.dat') as f:
for piece in read_in_chunks(f):
process_data(piece)
Another option would be to use iter and a helper function:
f = op...
ERROR 1130 (HY000): Host '' is not allowed to connect to this MySQL server [duplicate]
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and now it just complains that Access denied for user
– user3338098
Nov 4 '15 at 17:34
5
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How to create an object for a Django model with a many to many field?
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class Sample(models.Model):
users = models.ManyToManyField(Users)
Now, in a shell or other code, create 2 users, create a sample object, and bulk add the users to that sample object.
Users().save()
Users().save()
# Access the through model directly
ThroughModel = Sample.users.through
use...
Create a custom event in Java
...ic void sayHello() {
System.out.println("Hello!!");
// Notify everybody that may be interested.
for (HelloListener hl : listeners)
hl.someoneSaidHello();
}
}
// Someone interested in "Hello" events
class Responder implements HelloListener {
@Override
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Compare two DataFrames and output their differences side-by-side
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df_final = df_all.swaplevel(axis='columns')[df.columns[1:]]
df_final
Now, its much easier to spot the differences in the frames. But, we can go further and use the style property to highlight the cells that are different. We define a custom function to do this which you can see in this part of...
How is Racket different from Scheme?
...This answer should be updated. Racket's feature set far outweighs Scheme's now, with modules and language definitions, etc.
– CinchBlue
Dec 11 '17 at 2:57
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