"Becoming a Python Coding Pro: 22 Useful Code Examples and More Insights"

"Becoming a Python Coding Pro: 22 Useful Code Examples and More Insights"

Python is one of the most popular programming languages, known for its versatility and usefulness in solving everyday tasks. In this article, we will explore 22 useful code examples that harness the power of Python. Some of these examples may be familiar to you, while others will introduce new and interesting concepts. All of these examples are easy to remember and can be applied in your coding journey.

1. Finding Vowels

This code example returns the vowels found in a string. It can be useful for searching or identifying vowels.

def get_vowels(string):  
    return [each for each in string if each in "aeiou"]  
  
get_vowels("animal")   ['a', 'i', 'a']  
get_vowels("sky")   []  
get_vowels("football")   ['o', 'o', 'a']  

2. Capitalizing the First Letter

This example capitalizes the first letter of each word in a string. It is useful for text analysis, data recording, and file writing.

def capitalize(string):  
    return string.title()  
  
capitalize("shop")   'Shop'  
capitalize("python programming")   'Python Programming'  
capitalize("how are you!")   'How Are You!'  

3. Printing a String Multiple Times

This example prints a given string n times without using loops in Python.

n = 5  
string = "Hello World "  
print(string * n)  
 Output: Hello World Hello World Hello World Hello World Hello World  

4. Merging Two Dictionaries

This example merges two dictionaries into one.

def merge(dict1, dict2):  
    dict3 = dict1.copy()  
    dict3.update(dict2)  
    return dict3  
  
dict1 = {1: "hello", 2: "world"}  
dict2 = {3: "Python", 4: "Programming"}  
merge(dict1, dict2)  
 Output: {1: 'hello', 2: 'world', 3: 'Python', 4: 'Programming'}  

5. Calculating Execution Time

This example is useful when you need to know the execution time of a program or function.

import time  
  
start_time = time.time()  
  
def fun():  
    a = 2  
    b = 3  
    c = a + b  
  
end_time = time.time()  
fun()  
timetaken = end_time - start_time  
print("Your program takes:", timetaken)  
 Output: Your program takes: 0.0345  

6. Swapping Variable Values

This is a quick way to swap the values of two variables without using a third variable.

a = 3  
b = 4  
a, b = b, a  
print(a, b)  
 Output: a = 4, b = 3  

7. Checking for Duplicates

This is the fastest way to check for duplicate values in a list.

def check_duplicate(lst):  
    return len(lst) != len(set(lst))  
  
check_duplicate([1, 2, 3, 4, 5, 4, 6])   True  
check_duplicate([1, 2, 3])   False  
check_duplicate([1, 2, 3, 4, 9])   False  

8. Filtering False Values

This example is used to remove all false values from a list, such as false, 0, None, or an empty string.

def filtering(lst):  
    return list(filter(None, lst))  
  
lst = [None, 1, 3, 0, "", 5, 7]  
filtering(lst)  
 Output: [1, 3, 5, 7]  

9. Calculating Byte Size

This example returns the length of a string in bytes, which is useful when you need to know the size of a string variable.

def byte_size(string):  
    return len(string.encode("utf8"))  
  
byte_size("Python")   6  
byte_size("Data")   4  

10. Checking Memory Usage

This example allows you to get the memory usage of any variable in Python.

import sys  
  
var1 = "Python"  
var2 = 100  
var3 = True  
  
print(sys.getsizeof(var1))   55  
print(sys.getsizeof(var2))   28  
print(sys.getsizeof(var3))   28  

11. Anagrams

This code is useful for checking whether a string is an anagram. An anagram is a word formed by rearranging the letters of another word.

from collections import Counter  
  
def anagrams(str1, str2):  
    return Counter(str1) == Counter(str2)  
  
anagrams("abc1", "1bac")   True  

12. Sorting a List

This example sorts a list. Sorting is a commonly used task that can be implemented with a loop, but you can speed up your work using the built-in sort method.

my_list = ["leaf", "cherry", "fish"]  
my_list1 = ["D", "C", "B", "A"]  
my_list2 = [1, 2, 3, 4, 5]  
  
my_list.sort()   ['cherry', 'fish', 'leaf']  
my_list1.sort()   ['A', 'B', 'C', 'D']  
print(sorted(my_list2, reverse=True))   [5, 4, 3, 2, 1]  

13. Sorting a Dictionary

This example sorts a dictionary.

orders = {  
    'pizza': 200,  
    'burger': 56,  
    'pepsi': 25,  
    'coffee': 14  
}  
  
sorted_dic = sorted(orders.items(), key=lambda x: x[1])  
print(sorted_dic)  
 Output: [('coffee', 14), ('pepsi', 25), ('burger', 56), ('pizza', 200)]  

14. Getting the Last Element of a List

This example retrieves the last element of a list.

my_list = ["Python", "JavaScript", "C++", "Java", "C", "Dart"]  
  
 Method 1  
print(my_list[-1])   'Dart'  
  
 Method 2  
print(my_list.pop())   'Dart'  

15. Converting a Comma-Separated List to a String

This code converts a comma-separated list into a single string. It is useful when you need to concatenate the entire list with a string.

my_list1 = ["Python", "JavaScript", "C++"]  
my_list2 = ["Java", "Flutter", "Swift"]  
  
 Example 1  
print("My favourite Programming Languages are", ", ".join(my_list1))  
 Output: My favourite Programming Languages are Python, JavaScript, C++  
  
print(", ".join(my_list2))   'Java, Flutter, Swift'  

16. Checking for Palindromes

This example demonstrates a quick way to check for palindromes.

def palindrome(data):  
    return data == data[::-1]  
  
palindrome("level")   True  
palindrome("madaa")   False  

17. Shuffling a List

This code shuffles a list using the shuffle function from the random module.

from random import shuffle  
  
my_list1 = [1, 2, 3, 4, 5, 6]  
my_list2 = ["A", "B", "C", "D"]  
  
shuffle(my_list1)   [4, 6, 1, 3, 2, 5]  
shuffle(my_list2)   ['A', 'D', 'B', 'C']  

18. Converting String Cases

This example converts a string to uppercase or lowercase.

str1 = "Python Programming"  
str2 = "IM A PROGRAMMER"  
  
print(str1.upper())   'PYTHON PROGRAMMING'  
print(str2.lower())   'im a programmer'  

19. String Formatting

This code allows you to format a string. Formatting in Python involves concatenating data from variables to a string.

 Example 1  
str1 = "Python Programming"  
str2 = "I'm a {}".format(str1)   "I'm a Python Programming"  
  
 Example 2 (f-string method)  
str1 = "Python Programming"  
str2 = f"I'm a {str1}"   "I'm a Python Programming"  

20. Substring Search

This example will be useful for searching for substrings in a string. We will implement it in two ways to avoid writing too much code.

programmers = [  
    "I'm an expert Python Programmer",  
    "I'm an expert Javascript Programmer",  
    "I'm a professional Python Programmer",  
    "I'm a beginner C++ Programmer"  
]  
  
 Method 1  
for p in programmers:  
    if p.find("Python"):  
        print(p)  
  
 Method 2  
for p in programmers:  
    if "Python" in p:  
        print(p)  

21. Printing on the Same Line

By default, the print function outputs each string on a new line. To print on the same line, we can