A Comprehensive List of Commonly Used Python Commands

Python, as a widely used programming language, offers a vast array of commands and functions that enable developers to build robust and efficient applications. In this blog post, we will explore a comprehensive list of commonly used Python commands, along with brief explanations of their functionality and usage.

1. Basic Input/Output Commands

• print(): Displays the specified message or value on the screen.

pythonprint("Hello, World!")


input(): Prompts the user for input and returns the entered value as a string.

pythonuser_input = input("Enter your name: ")
print("Hello, " + user_input + "!")

2. Data Types and Variables

int(), float(), str(), bool(): Convert data to the specified type.

pythonnum = int(input("Enter a number: "))
text = str(num)
print("You entered: " + text)


Variable assignment: Assigns a value to a variable.

pythonx = 10
y = 20
z = x + y
print(z)  # Output: 30

3. Control Flow Statements

if, elif, else: Used for conditional execution.

pythonx = 10
if x > 0:
    print("x is positive")
else:
    print("x is non-positive")


for loop: Iterates over a sequence (e.g., list, tuple, string).

pythonfor i in range(5):
    print(i)


while loop: Executes a block of code while a condition is true.

pythoni = 0
while i < 5:
    print(i)
    i += 1


break: Used to exit a loop prematurely.
continue: Skips the rest of the current loop iteration and moves to the next one.

4. Functions

def: Defines a new function.

pythondef greet(name):
    return "Hello, " + name + "!"

print(greet("Alice"))  # Output: Hello, Alice!

5. Lists, Tuples, and Dictionaries

Lists: Ordered, mutable collection of elements.

pythonmy_list = [1, 2, 3, 4, 5]
print(my_list[2])  # Output: 3


Tuples: Ordered, immutable collection of elements.

pythonmy_tuple = (1, 2, 3, 4, 5)
print(my_tuple[1])  # Output: 2


Dictionaries: Unordered, mutable collection of key-value pairs.

pythonmy_dict = {"name": "Alice", "age": 30}
print(my_dict["name"])  # Output: Alice

6. Modules and Packages

import: Imports a module or package.

pythonimport math
print(math.sqrt(16))  # Output: 4.0


from ... import ...: Imports specific functions or classes from a module.

pythonfrom math import sqrt
print(sqrt(16))  # Output: 4.0

7. File I/O

open(): Opens a file and returns a file object.

pythonwith open("myfile.txt", "w") as file:
    file.write("Hello, World!")


Other common file operations include read(), write(), close(), etc.

Conclusion
Python offers a diverse set of commands and functions that cover various programming needs. The commands discussed in this blog post are just a fraction of what Python has to offer. As you delve deeper into Python programming, you will encounter many more commands and techniques that will help you build more complex and powerful applications.