How Should I Use ‘has_key()’ or ‘in’ on Python Dicts?

In this post we will get to know how Should we use ‘has_key()’ or ‘in’ on Python dicts where we can use the same using ‘in keyword to check if a key is present in a dictionary although it (has_key’) is removed from the latest versions of python like python3 and latest version.

has_key

Use of has_key

Here we have used the ‘in’ clause to implement the same and get the things done so we have given an example for the same where we can implement the code and get it done.

my_dict = {"a": 1, "b": 2, "c": 3}

if "a" in my_dict:
    print(" Key 'a' is present in the dictionary")
else:
    print(" Key 'a' is not present in the dictionary")

And the output of the same will be as followed.

Key 'a' is present in the dictionary

As here we can also use ‘not in’ as just the opposite of what it is doing where the output will be generated just opposite what just now produced. for the same we have given an example and a code to understand in implementing the same in our project.

if "d" not in my_dict:
    print( "Key 'd' is not present in the dictionary")
else:
    print( "Key 'd' is present in the dictionary")

And the output of the result of the same will be as followed.

Key 'd' is not present in the dictionary

So, At last, we would like to recommend the ‘in’ keyword for executing the same and check the presence of a key in the given dictionary of python

There are certain things that we need to keep in mind during the execution of in function which are as followed.

It only checks for the key present in the dictionary not the value so here we need to keep in mind that we focus on keys only. and if we want to check for the value then we ned to specify it that we are dealing with values and for dealing with values and specifying the same we have given an example here to understand it better.

my_dict = {"a": 1, "b": 2, "c": 3}

if 2 in my_dict.values():
    print(" Value 2 is present in the dictionary")
else:
    print(" Value 2 is not present in the dictionary")

Which will result in the following output.

Value 2 is present in the dictionary

Another thing that we need to keep in mind here is When using in to check if a key is present in a dictionary, the operation takes constant time on average, regardless of the size of the dictionary.

 

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To learn more about solutions to different problems and tutorials for the concepts we need to know to work on programming along with different ways to solve any generally asked problems: How To Pass-Variables From A Java & Python Client To A Linux/Ubuntu Server Which Is Running C?.

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