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!\n") 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