Python check if list is empty
Akash Mittal
To check if list is empty in Python, you can use multiple methods like – if not list_var: or if len(list_var) == 0:. There are many ways but not all…
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Python dictionary add, delete, update, exists keys with performance
To work with Python dictionary, we should know how to add, delete, update and check the existence of keys. In this article we will look at different methods and calculate…
java.lang.NullPointerException
Java throws the exception java.lang.NullPointerException, when you declare an object but do not instantiate it and yet use it for calling a class method or setting / getting variables. Consider…
TypeError: string indices must be integers – Python
Python throws typeerror string indices must be integers when you try to index strings using another string. For example – In this code, we are defining a string variable superhero…
valueerror: setting an array element with a sequence – Python
Python throws valueerror: setting an array element with a sequence, when you are trying to create an array with the list which is not proper multi-dimensional in shape. Another reason…
TypeError: a bytes-like object is required, not ‘str’ Python – Code Example
Python3 throws the TypeError: a bytes like object is required, not ‘str’, when we try to do string operations on binary values. It generally appears when you open a file…
Python string substring, contains, find and index comparison
To get the substring within a string, we can use different functions like contains, find, index and in. In this article we will look at the code examples of all…
IndentationError: unindent does not match any outer indentation level
Python throws the error, IndentationError: unindent does not match any outer indentation level, When you mix spaces and tabs in the same code. You can either use tabs or spaces…
Sorting a dictionary by value in Python
First of all, if sorting a dictionary by value is the frequent operation then you should consider using different data structure. But if your use case is to access data…
ValueError: invalid literal for int() with base 10: ”
Python throws the error, ValueError: invalid literal for int() with base 10: ”, when you pass a float string in int() function. Although, you can pass the string in float()…
React JS – How to return response in Async function?
Long story short, in order to return response in Async function, you either need a callback or use async/await structure. Case 1: Using callback – Callback is the function which…
Updating nested state properties in React JS
To update nested state properties in React JS, you can make a copy of state using library like Lodash and store it using setState or useState hook function with required…
How to create for loop inside React JSX?
Yes you an create a for loop inside react JSX with the help of function callback approach. In fact, you can run any code within JSX using this approach. But…
React-router urls don’t work on browser refresh or entered manually
If your react router urls don’t work on browser refresh or when entered manually, then it means you have not configured paths on your server. Simply point all the urls…
How to navigate in React Router programmatically?
This is a common use case when we want to navigate in React router programmatically without using Link or NavLink components. There are many ways of doing that but since…
PHP error 404 on IIS server – How did I solve the error.
I was working on IIS server and trying to run php but got 404 errors on all pages. Although static files were working fine but php were not. In this…
‘dataframe’ object has no attribute ‘sort’ – Python Error
Python throws the error, ‘dataframe’ object has no attribute ‘sort’, because Pandas deprecated sort() function in favor of sort_values() and sort_index(). As, the name indicates, sort_values() is used to sort…
.xauthority does not exist – Linux Error
xauth fails to create .xauthority file and throws error, .xauthority does not exist if either the disk is full and there is no more space to create any new file…
.map is not a function
map() can only be used with Arrays. So, if you are getting error .map is not a function, you are probably using it on either the objects or other variables…
How to loop each block on provided length – Svelte
In this article I will show how to loop each block on provided length. This could be done by using either the Array() function or length property. Using Array() –…