How to check if a variable is None in Python
In this post we will give you information about How to check if a variable is None in Python. Hear we will give you detail about How to check if a variable is None in PythonAnd how to use it also give you demo for it if it is necessary.
we are going to learn about how to check if a variable is None or not in Python with the help of examples.
Note: None means null value in Python.
Consider, that we have the following variable in our code:
x = None
Now, we need to check if the above variable is None or not.
Using is keyword
To check if a variable is None or not, we can use the is keyword in Python.
The is keyword returns True, if the both values refers to the same object. Otherwise, it returns false.
Here is an example:
x = Noneif x is None: print('Variable is None')else: print('Variable is not None')
Output:
'Variable is None'
In the above code,
-
We have first initialized a variable with a None value.
-
Then we used is keyword to check if both values refers to same object.
If it returns True it prints the variable is None, if variable is not None then it returns False and prints Variable is not None.
Other example:
y = 10if y is None: print('Variable is None')else: print('Variable is not None')
Output:
'Variable is not None'
Similarly, we can also use the isinstance() function in Python to check if a given variable is None.
x = Noneif isinstance(x, type(None)): print('Variable is None')else: print('Variable is not None')
The isinstance() function takes the two arguments, the first argument is object, and the second argument is type then It returns True if a given object is a specified type otherwise it returnsFalse.
Hope this code and post will helped you for implement How to check if a variable is None in Python. if you need any help or any feedback give it in comment section or you have good idea about this post you can give it comment section. Your comment will help us for help you more and improve us. we will give you this type of more interesting post in featured also so, For more interesting post and code Keep reading our blogs
PHP - I Can't get the $_POST Values on Ajax Request
In this post we will give you information about PHP - I Can't get the $_POST Values on Ajax Request. Hear we will give you detail about PHP - I Can't get the $_POST Values on Ajax RequestAnd how to use it also give you demo for it if it is necessary.
I want to share this posts with you because when i was working on native PHP and Ajax Post request(Specially AngularJS Post request) at that time i can't get Post value on form submit. That's why i would like to share you this post. I also want to tell you i was working on my Ubuntu 14.04. I did try lot but i can't get value.
At last find stuff to how to solve this issue, i did use "file_get_contents('php://input')" that way i could get POST value in json object and i also decode json value using "json_decode()". So let's try this way :
Example:
$post = file_get_contents('php://input');
$post = json_decode($post);
$sql = "INSERT INTO items (title) VALUES ('".$post->title."')";
$result = $mysqli->query($sql);
Hope this code and post will helped you for implement PHP - I Can't get the $_POST Values on Ajax Request. if you need any help or any feedback give it in comment section or you have good idea about this post you can give it comment section. Your comment will help us for help you more and improve us. we will give you this type of more interesting post in featured also so, For more interesting post and code Keep reading our blogs