In this tutorial, we will look at how to check if the user input in Python is empty or not with the help of some examples.
How to check if user input is empty?
Values from the standard input are read as strings in Python. So, to check if the input is empty use the equality operator == in Python to check if the input string is equal to an empty string or not.
The following is the syntax –
# check if input is empty s = input() print(s == '')
It returns True if the input string is empty and False otherwise
Let’s now look at some examples of using the above syntax –
First, let’s take an empty input using the input() function and then check if it’s empty or not.
# take input from user s = input() # check if input is emtpy print(s == '')
Output:
True
Here, we gave an empty input. Since the input string is an empty string, we get True as the output.
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Let’s try another example. This time we’ll pass a value to the input.
# take input from user s = input() # check if input is emtpy print(s == '')
Output:
cat False
We get False as the output since the input string is non-empty.
Note that, if you pass one or more spaces as input, it will be considered as a non-empty string.
# take input from user s = input() # check if input is emtpy print(s == '')
Output:
False
We get False as the output.
In case, you want to omit the starting and trailing spaces from the entered string, you can the string strip() function and then check for the empty input.
# take input from user s = input() # check if input is emtpy print(s.strip() == '')
Output:
True
Now, we get True as the output.
You might also be interested in –
- Python – Check If Input Is a Number
- Python – Check If String Ends with a Newline Character
- Python – Check If String Contains Vowels
- Python – Check If All Characters in String are Same
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