With the aid of examples, we will go over Python’s keywords and identifiers in this article.
What does Python stand for?
A reserved term in Python is one that you cannot use as the name of a variable, class, function, etc. In the Python programming language, certain keywords serve specific functions and have unique meanings. For instance, since the Python term “while” is used for the while loop, you should avoid naming a variable “while” in order to avoid compilation errors.
Python 3.6 has 33 keywords in all. Open command prompt (terminal on Mac OS) and enter “Python” to acquire the operating system’s keyword list. Then, type help() and press Enter. To get a list of the keywords for the Python version that is currently running on your operating system, enter keywords.
Chaitanyas-MacBook-Pro:~ chaitanyasingh$ Python 3.6 ... >>> help() Welcome to Python 3.6's help utility! ... help> keywords Here is a list of the Python keywords. Enter any keyword to get more help. False def if raise None del import return True elif in try and else is while as except lambda with assert finally nonlocal yield break for not class from or continue global pass
A Python keyword example
The while keyword is used in the example below to build a loop that displays the values of the num variables as long as they are larger than 5.
num = 10 while num>5: print(num) num -= 1
Identifiers in Python
Python variables were covered in the last article.
Id is another name for the variable name. While naming variables in Python, there are a few guidelines that you must adhere to.
Here, for instance, the variable is of the integer type and contains the number 10. Identifier is the name of the variable, whose name is num.
num = 10
1. Either a letter or an underscore (_) must always come before the variable name. For instance, the names _str, str, num, and _num are all acceptable names for variables.
2. A number cannot be the first character in the variable’s name. For instance, the variable name 9num is not acceptable.
3. Only alphanumeric letters and underscores (A to Z, a to z, 0-9, or _) may be used in the variable name; special characters such as %, $, and # are not permitted.
4. Python’s case-sensitivity for variable names means that num and NUM are two separate variables.
Example of a Python identifier
There are three variables in the example that follows. The identifiers are the names of the variables num, _x, and a b.
# few examples of identifiers num = 10 print(num) _x = 100 print(_x) a_b = 99 print(a_b)