Python Keywords: 10 Example Code Snippets

Python is an elegant and powerful programming language whose design emphasizes readability; its keywords are reserved identifiers that define the language's syntax. Understanding these keywords is fundamental for writing effective Python code.

Example 1: Using if for conditional judgment

x = 10
if x > 5:
    print("x is greater than 5.")

Output: x is greater than 5. Example 2: Using for to iterate over a list

fruits = ["apple", "banana", "cherry"]
for fruit in fruits:
    print(fruit)

Output:

apple

banana

cherry

Example 3: Defining a function with def

def greet(name):
    print(f"Hello, {name}!")
greet("Alice")

Output: Hello, Alice! Example 4: Defining a class with class

class Person:
    def __init__(self, name, age):
        self.name = name
        self.age = age
    def introduce(self):
        print(f"My name is {self.name} and I am {self.age} years old.")
person = Person("Bob", 30)
person.introduce()

Output: My name is Bob and I am 30 years old. Example 5: Handling exceptions with try and except

try:
    result = 10 / 0
except ZeroDivisionError:
    print("Cannot divide by zero.")

Output: Cannot divide by zero. Example 6: Managing file operations with with

with open('example.txt', 'w') as file:
    file.write("Hello, world!
")
with open('example.txt', 'r') as file:
    print(file.read())

Output: Hello, world! Example 7: Importing a module with import

import math
print(math.sqrt(16))

Output: 4.0 Example 8: Returning a value from a function with return

def add(a, b):
    return a + b
result = add(5, 3)
print(result)

Output: 8 Example 9: Creating an infinite loop with while and breaking out

i = 0
while True:
    print(i)
    i += 1
    if i >= 5:
        break

Output:

0

1

2

3

4

Example 10: Extending conditional branches with elif

score = 85
if score >= 90:
    grade = "A"
elif score >= 80:
    grade = "B"
else:
    grade = "C"
print(f"Your grade is {grade}.")

Output: Your grade is B. Tip: Python 3.10 defines 35 keywords, including all shown above. Avoid using keywords as variable or function names to prevent unexpected behavior.

Keyword list (partial):

False, None, True, and, as, assert, async, await, break, class, continue, def, del, elif, else, except, finally, for, from, global, if, import, in, is, lambda, nonlocal, not, or, pass, raise, return, try, while, with, yield