Python Basics

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About

Python is very popular for being a much simpler and readable language. For example, let's look at a program that prints "Hello World!" in both Java and Python.

Java is a much more strict language, and information such as packages and classes must be identified in the code.

package java;
public class Print{
    public static void main(String[] args){
        System.out.println("Hello World!");
    }
}
              

In Python, this task can be accomplished in only one line.

print("Hello World!")

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Python Basics (for programmers)

	Java	Python
File Naming	Program.java	program.py
Output	System.out.println("Hello World!");	print("Hello World!")
Variables	int x=5; String name="Mickey Engel";	x=5 name="Mickey Engel"
Input	Scanner sc=new Scanner(System.in); name=sc.nextLine();	name=input("Enter your name:")
Comments	//single line comment /* multi-line comment */	#single line comment """ multi-line comment """
Concatenation	"Hello, "+name;	"Hello, "+name

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Python Math and String Methods

	Java	Python
Importing	import java.util.Math;	import math
Rounding	Math.floor(x); Math.ceil(x); Math.round(x);	math.floor(x) math.ceil(x) math.round(x)
Comparisons	Math.max(x,y); Math.min(x,y);	min(x,y) max(x,y)
Powers	Math.pow(x,y); Math.sqrt(x);	pow(x,y); math.sqrt(x)
PI	Math.PI	math.pi()
Case Conversions	str.toUpperCase(); str.toLowerCase();	str.upper() str.lower()
String Length	str.length();	len(str)
Substrings	str.substring(start, end);	str[start, end]