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Accessing the index in 'for' loops?
...etimes more commonly (but unidiomatically) found in Python:
for index in range(len(items)):
print(index, items[index])
Use the Enumerate Function
Python's enumerate function reduces the visual clutter by hiding the accounting for the indexes, and encapsulating the iterable into another ite...
Getting a slice of keys from a map
...= make(map[int]string)
keys := make([]int, 0, len(mymap))
for k := range mymap {
keys = append(keys, k)
}
}
To be efficient in Go, it's important to minimize memory allocations.
share
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What's the best way to make a d3.js visualisation layout responsive?
...olution that does not rely on using a viewBox:
The key is in updating the range of the scales which are used to place data.
First, calculate your original aspect ratio:
var ratio = width / height;
Then, on each resize, update the range of x and y:
function resize() {
x.rangeRoundBands([0, w...
ASP.NET MVC Performance
...Forms application, and B) how you implement the MVC application. In their "raw" forms, MVC is likely faster than WebForms, but years and years of tools and experience have produced a number of techniques for building fast WebForms applications. I'd be willing to bet that a senior ASP.NET developer c...
How to write the Fibonacci Sequence?
... the program wrongly. Instead of returning the Fibonacci numbers between a range (ie. startNumber 1, endNumber 20 should = only those numbers between 1 & 20), I have written for the program to display all Fibonacci numbers between a range (ie. startNumber 1, endNumber 20 displays = First 20 Fibonacc...
Int or Number DataType for DataAnnotation validation attribute
...
For any number validation you have to use different different range validation as per your requirements :
For Integer
[Range(0, int.MaxValue, ErrorMessage = "Please enter valid integer Number")]
for float
[Range(0, float.MaxValue, ErrorMessage = "Please enter valid float Number")]...
Regular expression for first and last name
...fails) «[A-Z]{1}[a-z]{1,30}[- ]{0,1}»
Match a single character in the range between “A” and “Z” «[A-Z]{1}»
Exactly 1 times «{1}»
Match a single character in the range between “a” and “z” «[a-z]{1,30}»
Between one and 30 times, as many times as possible, giving bac...
How to overwrite the previous print to stdout in python?
...turn to the start of the line without advancing to the next line:
for x in range(10):
print '{0}\r'.format(x),
print
The comma at the end of the print statement tells it not to go to the next line. The last print statement advances to the next line so your prompt won't overwrite your final outp...
How to declare array of zeros in python (or an array of a certain size) [duplicate]
... you have to use a list comprehension like this:
buckets = [[0 for col in range(5)] for row in range(10)]
to avoid reference sharing between the rows.
This looks more clumsy than chester1000's code, but is essential if the values are supposed to be changed later. See the Python FAQ for more deta...
Read file data without saving it in Flask
...image_string.decode('utf-8')
#use this to remove b'...' to get raw string
return render_template('handleUpload.html',filestring = image_string)
return render_template('upload.html')
in html file
<html>
<head>
<title>Simple file upload using Python...