Python Vs. Javascript

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The main differences between Python and JavaScript are in the way people use them. Python has many applications including science and the back end of data web applications . On the other hand, JavaScript developers use it primarily for the front end of web applications and rarely use it outside of a browser.

Python and JavaScript are two of the most languages popular programs today, and for good reason. They both have a huge amount of practical applications, especially in web development. Although these two programming languages ‚Äã‚Äãshare many similarities, they are quite different. It is important for web developers to learn both if they want to stay up to date with the latest advancements in the field.

In this article, we’ll take a look at the similarities and differences between Python and JavaScript, and why it’s a great idea to learn both. languages. We will show you where to learn these programming languages ‚Äã‚Äãfor free

Python and JavaScript: definitions

 Image from HTML and JavaScript books next to cactus.

Python is a dynamic and versatile object-oriented programming language. People use this high level language to develop applications, but it has a lot of other uses. Programmers use Python for web applications, desktop software, analysis of data , the learning machine and game development. It is possible to program a complete operating system with Python. This language is easy to learn , these average beginner programmers often choose.

Python and JavaScript: Similarities

Python and JavaScript have some notable similarities in usage and structure. Both are object oriented, which makes them ideal for large and complex software development .

A Additionally , JavaScript and Python are dynamically typed high-level coding languages , which makes learning fairly easy.

Both developers use website development . In fact, they’re a great addition to any full stack portfolio . Other than these similarities, Python and JavaScript are quite different.

Python vs JavaScript:. Differences

Python has many more applications than JavaScript. Games, software, mobile development and data analysis can be done entirely with Python. This makes it a popular choice for developers in many areas.

Additionally , programmers often use JavaScript and Python at opposite ends of web development. JavaScript is primarily a (or client-side) development language, while programmers typically use Python on back- end (or server-side script) of a website project. People tend to use JavaScript as well as HTML and CSS. Python, on the other hand, is often used on its own.

Which is better?

A computer screen displaying the code.

Neither Python nor JavaScript is better than the other. They are useful tools for certain activities and serve for particular purposes. For tasks like front-end development, JavaScript is a clear choice, but developers are unlikely to choose it for back-end development. As you can see, these two common programming languages ‚Äã‚Äãexcel in some areas and can work together to create a great system. p>

Review

In short, Python is a high level, dynamically typed, generic programming language. JavaScript is a programming language for web development that "is also high level and dynamically typed when it comes to the web, Python is great for the back end, while JavaScript is better for the front end

JavaScript and Python are both: ..

  • Object oriented
  • dynamically typed
  • high level

JavaScript and Python are different because:

Python and JavaScript are popular programming languages, so there are many free resources online and coding bootcamp courses . Codecademy offers a free online JavaScript course if for the beginners, which was supplemented by hundreds of thousands. Codecademy also offers a free online Python 2 course , which is a great way to start learning programming .

👻 Read also: what is the best laptop for engineering students?

Python Vs. Javascript JavaScript: Questions

JSON datetime between Python and JavaScript

4 answers

kevin By kevin

I want to send a datetime.datetime object in serialized form from Python using JSON and de-serialize in JavaScript using JSON. What is the best way to do this?

403

Answer #1

You can add the "default" parameter to json.dumps to handle this:

date_handler = lambda obj: (
    obj.isoformat()
    if isinstance(obj, (datetime.datetime, datetime.date))
    else None
)
json.dumps(datetime.datetime.now(), default=date_handler)
""2010-04-20T20:08:21.634121""

Which is ISO 8601 format.

A more comprehensive default handler function:

def handler(obj):
    if hasattr(obj, "isoformat"):
        return obj.isoformat()
    elif isinstance(obj, ...):
        return ...
    else:
        raise TypeError, "Object of type %s with value of %s is not JSON serializable" % (type(obj), repr(obj))

Update: Added output of type as well as value.
Update: Also handle date

Python Vs. Javascript JavaScript: Questions

What blocks Ruby, Python to get Javascript V8 speed?

4 answers

Are there any Ruby / Python features that are blocking implementation of optimizations (e.g. inline caching) V8 engine has?

Python is co-developed by Google guys so it shouldn"t be blocked by software patents.

Or this is rather matter of resources put into the V8 project by Google.

260

Answer #1

What blocks Ruby, Python to get Javascript V8 speed?

Nothing.

Well, okay: money. (And time, people, resources, but if you have money, you can buy those.)

V8 has a team of brilliant, highly-specialized, highly-experienced (and thus highly-paid) engineers working on it, that have decades of experience (I"m talking individually – collectively it"s more like centuries) in creating high-performance execution engines for dynamic OO languages. They are basically the same people who also created the Sun HotSpot JVM (among many others).

Lars Bak, the lead developer, has been literally working on VMs for 25 years (and all of those VMs have lead up to V8), which is basically his entire (professional) life. Some of the people writing Ruby VMs aren"t even 25 years old.

Are there any Ruby / Python features that are blocking implementation of optimizations (e.g. inline caching) V8 engine has?

Given that at least IronRuby, JRuby, MagLev, MacRuby and Rubinius have either monomorphic (IronRuby) or polymorphic inline caching, the answer is obviously no.

Modern Ruby implementations already do a great deal of optimizations. For example, for certain operations, Rubinius"s Hash class is faster than YARV"s. Now, this doesn"t sound terribly exciting until you realize that Rubinius"s Hash class is implemented in 100% pure Ruby, while YARV"s is implemented in 100% hand-optimized C.

So, at least in some cases, Rubinius can generate better code than GCC!

Or this is rather matter of resources put into the V8 project by Google.

Yes. Not just Google. The lineage of V8"s source code is 25 years old now. The people who are working on V8 also created the Self VM (to this day one of the fastest dynamic OO language execution engines ever created), the Animorphic Smalltalk VM (to this day one of the fastest Smalltalk execution engines ever created), the HotSpot JVM (the fastest JVM ever created, probably the fastest VM period) and OOVM (one of the most efficient Smalltalk VMs ever created).

In fact, Lars Bak, the lead developer of V8, worked on every single one of those, plus a few others.

Python Vs. Javascript JavaScript: Questions

Django Template Variables and Javascript

4 answers

When I render a page using the Django template renderer, I can pass in a dictionary variable containing various values to manipulate them in the page using {{ myVar }}.

Is there a way to access the same variable in Javascript (perhaps using the DOM, I don"t know how Django makes the variables accessible)? I want to be able to lookup details using an AJAX lookup based on the values contained in the variables passed in.

256

Answer #1

The {{variable}} is substituted directly into the HTML. Do a view source; it isn"t a "variable" or anything like it. It"s just rendered text.

Having said that, you can put this kind of substitution into your JavaScript.

<script type="text/javascript"> 
   var a = "{{someDjangoVariable}}";
</script>

This gives you "dynamic" javascript.

How can I open multiple files using "with open" in Python?

5 answers

I want to change a couple of files at one time, iff I can write to all of them. I"m wondering if I somehow can combine the multiple open calls with the with statement:

try:
  with open("a", "w") as a and open("b", "w") as b:
    do_something()
except IOError as e:
  print "Operation failed: %s" % e.strerror

If that"s not possible, what would an elegant solution to this problem look like?

788

Answer #1

As of Python 2.7 (or 3.1 respectively) you can write

with open("a", "w") as a, open("b", "w") as b:
    do_something()

In earlier versions of Python, you can sometimes use contextlib.nested() to nest context managers. This won"t work as expected for opening multiples files, though -- see the linked documentation for details.


In the rare case that you want to open a variable number of files all at the same time, you can use contextlib.ExitStack, starting from Python version 3.3:

with ExitStack() as stack:
    files = [stack.enter_context(open(fname)) for fname in filenames]
    # Do something with "files"

Most of the time you have a variable set of files, you likely want to open them one after the other, though.

open() in Python does not create a file if it doesn"t exist

5 answers

What is the best way to open a file as read/write if it exists, or if it does not, then create it and open it as read/write? From what I read, file = open("myfile.dat", "rw") should do this, right?

It is not working for me (Python 2.6.2) and I"m wondering if it is a version problem, or not supposed to work like that or what.

The bottom line is, I just need a solution for the problem. I am curious about the other stuff, but all I need is a nice way to do the opening part.

The enclosing directory was writeable by user and group, not other (I"m on a Linux system... so permissions 775 in other words), and the exact error was:

IOError: no such file or directory.

778

Answer #1

You should use open with the w+ mode:

file = open("myfile.dat", "w+")

Difference between modes a, a+, w, w+, and r+ in built-in open function?

5 answers

In the python built-in open function, what is the exact difference between the modes w, a, w+, a+, and r+?

In particular, the documentation implies that all of these will allow writing to the file, and says that it opens the files for "appending", "writing", and "updating" specifically, but does not define what these terms mean.

721

Answer #1

The opening modes are exactly the same as those for the C standard library function fopen().

The BSD fopen manpage defines them as follows:

 The argument mode points to a string beginning with one of the following
 sequences (Additional characters may follow these sequences.):

 ``r""   Open text file for reading.  The stream is positioned at the
         beginning of the file.

 ``r+""  Open for reading and writing.  The stream is positioned at the
         beginning of the file.

 ``w""   Truncate file to zero length or create text file for writing.
         The stream is positioned at the beginning of the file.

 ``w+""  Open for reading and writing.  The file is created if it does not
         exist, otherwise it is truncated.  The stream is positioned at
         the beginning of the file.

 ``a""   Open for writing.  The file is created if it does not exist.  The
         stream is positioned at the end of the file.  Subsequent writes
         to the file will always end up at the then current end of file,
         irrespective of any intervening fseek(3) or similar.

 ``a+""  Open for reading and writing.  The file is created if it does not
         exist.  The stream is positioned at the end of the file.  Subse-
         quent writes to the file will always end up at the then current
         end of file, irrespective of any intervening fseek(3) or similar.

We hope this article has helped you to resolve the problem. Apart from Python Vs. Javascript, check other JavaScript-related topics.

Want to excel in Python? See our review of the best Python online courses 2022. If you are interested in Data Science, check also how to learn programming in R.

By the way, this material is also available in other languages:



Walter Lehnman

Boston | 2022-11-30

Maybe there are another answers? What Python Vs. Javascript exactly means?. Checked yesterday, it works!

Jan Nickolson

Berlin | 2022-11-30

Maybe there are another answers? What Python Vs. Javascript exactly means?. Will use it in my bachelor thesis

Anna Nickolson

Munchen | 2022-11-30

tile is always a bit confusing 😭 Python Vs. Javascript is not the only problem I encountered. Checked yesterday, it works!

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