PHP Ds / Deque insert () function

|
Syntax:
public DsDeque::insert ($index, $values): void
Parameters:this function takes two parameters as above and described below:
  • $index:this parameter contains the index at which the element should be inserted .
  • $value:this parameter contains the value that will be inserted into the given index in the Deque.
Returned value: this function does not return any value.Exception:this function throws OutOfRangeException if Deque is empty. The programs below illustrate the Ds / Deque::insert()function in PHP:Program 1:
// About declare deque $deck = new DsDeque ([1, 2, 3, 4, 5, 6]); echo ( " Elements in the Deque " );
// Show Deque elements print_r ( $deck ); echo ( " Insert 10 at index 4 in the deque " );
// Use the insert() function to insert
// element in the deck at index 4 $deck -> insert (4, 10);
// Show Deque elements print_r ( $deck );
?>
Exit:
Elements in the Deque DsDeque Object ([0] = > 1 [1] = > 2 [2] = > 3 [3] = > 4 [4] = > 5 [5] = > 6) Insert 10 at index 4 in the deque DsDeque Object ([0] = > 1 [1] = > 2 [2] = > 3 [3] = > 4 [4] = > 10 [5] = > 5 [6] = > 6)
Program 2:
// Declare deque $deck = new DsDeque ([1 , 2, 3, 4, 5, 6]); echo ( " Original Deque " );
// Show Deque elements print_r ( $deck ); echo ( " Modified Deque " );
// Use the insert() function to insert
// element in the deck at index 4 $deck -> insert (3, ... [10, 20, 30, 40]);
// Show Deque elements print_r ( $deck );
?>
Exit:
Original Deque DsDeque Object ([0] = > 1 [1] = > 2 [2] = > 3 [3] = > 4 [4] = > 5 [5] = > 6) Modified Deque DsDeque Object ( [0] = > 1 [1] = > 2 [2] = > 3 [3] = > 10 [4] = > 20 [5] = > 30 [6] = > 40 [ 7] = > 4 [8] = > 5 [9] = > 6)
Link:http://php.net/manual/en/ds-deque.insert.php

PHP Ds / Deque insert () function: StackOverflow Questions

How to insert newlines on argparse help text?

I"m using argparse in Python 2.7 for parsing input options. One of my options is a multiple choice. I want to make a list in its help text, e.g.

from argparse import ArgumentParser

parser = ArgumentParser(description="test")

parser.add_argument("-g", choices=["a", "b", "g", "d", "e"], default="a",
    help="Some option, where
"
         " a = alpha
"
         " b = beta
"
         " g = gamma
"
         " d = delta
"
         " e = epsilon")

parser.parse_args()

However, argparse strips all newlines and consecutive spaces. The result looks like

~/Downloads:52$ python2.7 x.py -h
usage: x.py [-h] [-g {a,b,g,d,e}]

test

optional arguments:
  -h, --help      show this help message and exit
  -g {a,b,g,d,e}  Some option, where a = alpha b = beta g = gamma d = delta e
                  = epsilon

How to insert newlines in the help text?

Answer #1:

Try using RawTextHelpFormatter:

from argparse import RawTextHelpFormatter
parser = ArgumentParser(description="test", formatter_class=RawTextHelpFormatter)

Is a Python list guaranteed to have its elements stay in the order they are inserted in?

If I have the following Python code

>>> x = []
>>> x = x + [1]
>>> x = x + [2]
>>> x = x + [3]
>>> x
[1, 2, 3]

Will x be guaranteed to always be [1,2,3], or are other orderings of the interim elements possible?

Answer #1:

Yes, the order of elements in a python list is persistent.

Inserting image into IPython notebook markdown

I am starting to depend heavily on the IPython notebook app to develop and document algorithms. It is awesome; but there is something that seems like it should be possible, but I can"t figure out how to do it:

I would like to insert a local image into my (local) IPython notebook markdown to aid in documenting an algorithm. I know enough to add something like <img src="image.png"> to the markdown, but that is about as far as my knowledge goes. I assume I could put the image in the directory represented by 127.0.0.1:8888 (or some subdirectory) to be able to access it, but I can"t figure out where that directory is. (I"m working on a mac.) So, is it possible to do what I"m trying to do without too much trouble?

Answer #1:

Most of the answers given so far go in the wrong direction, suggesting to load additional libraries and use the code instead of markup. In Ipython/Jupyter Notebooks it is very simple. Make sure the cell is indeed in markup and to display a image use:

![alt text](imagename.png "Title")

Further advantage compared to the other methods proposed is that you can display all common file formats including jpg, png, and gif (animations).

Answer #2:

Files inside the notebook dir are available under a "files/" url. So if it"s in the base path, it would be <img src="files/image.png">, and subdirs etc. are also available: <img src="files/subdir/image.png">, etc.

Update: starting with IPython 2.0, the files/ prefix is no longer needed (cf. release notes). So now the solution <img src="image.png"> simply works as expected.

how do I insert a column at a specific column index in pandas?

Can I insert a column at a specific column index in pandas?

import pandas as pd
df = pd.DataFrame({"l":["a","b","c","d"], "v":[1,2,1,2]})
df["n"] = 0

This will put column n as the last column of df, but isn"t there a way to tell df to put n at the beginning?

Answer #1:

see docs: http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.insert.html

using loc = 0 will insert at the beginning

df.insert(loc, column, value)

df = pd.DataFrame({"B": [1, 2, 3], "C": [4, 5, 6]})

df
Out: 
   B  C
0  1  4
1  2  5
2  3  6

idx = 0
new_col = [7, 8, 9]  # can be a list, a Series, an array or a scalar   
df.insert(loc=idx, column="A", value=new_col)

df
Out: 
   A  B  C
0  7  1  4
1  8  2  5
2  9  3  6

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