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cartesian product in pandas
...ultiIndex.from_product as an index in an otherwise empty dataframe, then reset its index, and you're done.
a = [1, 2, 3]
b = ["a", "b", "c"]
index = pd.MultiIndex.from_product([a, b], names = ["a", "b"])
pd.DataFrame(index = index).reset_index()
out:
a b
0 1 a
1 1 b
2 1 c
3 2 a
4 ...
How to dismiss keyboard for UITextView with return key?
... is easy enough to change the return key to "done" using either [textField setReturnKeyType: UIReturnKeyDone]; or using interface builder
– Casebash
Sep 28 '10 at 2:58
9
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Why does Java switch on contiguous ints appear to run faster with added cases?
...5 cases in my tests), it is in not inlined any longer with the default JVM settings - that is the likeliest cause for the drop in performance at that point.
With 5 cases, the decompiled code looks like this (notice the cmp/je/jg/jmp instructions, the assembly for if/goto):
[Verified Entry Point]...
UnicodeDecodeError: 'ascii' codec can't decode byte 0xef in position 1
...
This is to do with the encoding of your terminal not being set to UTF-8. Here is my terminal
$ echo $LANG
en_GB.UTF-8
$ python
Python 2.7.3 (default, Apr 20 2012, 22:39:59)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> s ...
Is String.Format as efficient as StringBuilder
...s the current version. This may no longer apply to later versions.
String.Format uses a StringBuilder internally:
public static string Format(IFormatProvider provider, string format, params object[] args)
{
if ((format == null) || (args == null))
{
throw new ArgumentNullException((...
Why does a return in `finally` override `try`?
...s any ECMAScript identifier or empty.
It's clear that return false would set completion type of finally as return, which cause try ... finally to do 4. Return F.
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Convert Pandas column containing NaNs to dtype `int`
I read data from a .csv file to a Pandas dataframe as below. For one of the columns, namely id , I want to specify the column type as int . The problem is the id series has missing/empty values.
...
How to replace an entire line in a text file by line number
...oes not seem to work. If you guys have problems with sed and its delimiter setting capabilities you may want to have a look at this: grymoire.com/Unix/Sed.html#uh-2 It says the first character behind the s determines the delimiter. So to change your command to use for example the # it would be like...
Understanding __get__ and __set__ and Python descriptors
...'s property type is implemented. A descriptor simply implements __get__, __set__, etc. and is then added to another class in its definition (as you did above with the Temperature class). For example:
temp=Temperature()
temp.celsius #calls celsius.__get__
Accessing the property you assigned the de...
Get first n characters of a string
How can I get the first n characters of a string in PHP? What's the fastest way to trim a string to a specific number of characters, and append '...' if needed?
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