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What's the difference between eval, exec, and compile?
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The short answer, or TL;DR
Basically, eval is used to evaluate a single dynamically generated Python expression, and exec is used to execute dynamically generated Python code only for its side effects.
eval and exec have these two differences:
eval accep...
Creating an empty Pandas DataFrame, then filling it?
...utocompletion), but that works with strings as date format, right? The overall approach works though (I changed index to something else).
– Matthias Kauer
Dec 15 '12 at 8:42
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Deleting multiple elements from a list
...somelist[0] , followed by del somelist[2] , the second statement will actually delete somelist[3] .
30 Answers
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Pretty print in MongoDB shell as default
...y, everything is output to a single line and it's difficult to read, especially with nested arrays and documents.
8 Answers...
How to determine if one array contains all elements of another array
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Perhaps this is easier to read:
a2.all? { |e| a1.include?(e) }
You can also use array intersection:
(a1 & a2).size == a1.size
Note that size is used here just for speed, you can also do (slower):
(a1 & a2) == a1
But I guess the first is more re...
Updating MySQL primary key
I have a table user_interactions with 4 columns:
3 Answers
3
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What can I do to resolve a “Row not found or changed” Exception in LINQ to SQL on a SQL Server Compa
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Thats nasty, but simple:
Check if the data types for all fields in the O/R-Designer match the data types in your SQL table.
Double check for nullable! A column should be either nullable in both the O/R-Designer and SQL, or not nullable in both.
For example, a NVARCHAR column "...
自动完成使用指导 · App Inventor 2 中文网
...GetValue("搜索历史", [])
自动完成1.SetSuggestions(文本输入框_搜索, 历史)
}
when 按钮_搜索.Click() {
if not contains(历史, 文本输入框_搜索.Text) {
listAdd(历史, 文本输入框_搜索.Text)
微数据库1.StoreValue("搜索历史", 历史)
自动完成1...
Get city name using geolocation
... as to which one will have the city.
"administrative_area_level_1" is usually what you are looking for but sometimes locality is the city you are after.
Anyhow - more details on google response types can be found here and here.
Below is the code that should do the trick:
<!DOCTYPE html> ...
How do I remove  from the beginning of a file?
...oks fine when I open it using gedit , but when it's read by PHP (to merge all the CSS files into one), this CSS has the following characters prepended to it: 
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