30 Minimal Python Tasks: Handy Code Snippets for Everyday Programming

The article introduces a collection of thirty compact Python tasks designed to help beginners practice real‑world coding patterns while reinforcing core language concepts.

1. Duplicate element detection

This function checks whether a list contains duplicate items by comparing its length to the length of a set built from the list.

def all_unique(lst):
    return len(lst) == len(set(lst))

x = [1,1,2,2,3,2,3,4,5,6]
y = [1,2,3,4,5]
print(all_unique(x))  # False
print(all_unique(y))  # True

2. Anagram (character composition) check

Using collections.Counter , this function determines whether two strings consist of the same characters.

from collections import Counter

def anagram(first, second):
    return Counter(first) == Counter(second)

print(anagram("abcd3", "3acdb"))  # True

3. Memory size of a variable

Shows how to obtain the memory footprint of an integer using sys.getsizeof .

import sys
variable = 30
print(sys.getsizeof(variable))  # 24

4. Byte size of a string

Calculates the number of bytes a Unicode string occupies when encoded in UTF‑8.

def byte_size(string):
    return len(string.encode('utf-8'))

print(byte_size('😀'))  # 4
print(byte_size('Hello World'))  # 11

5. Print a string N times without a loop

Uses string multiplication to repeat a string.

n = 2
s = "Programming"
print(s * n)  # ProgrammingProgramming

6. Capitalize the first letter of each word

Applies the title() method.

s = "programming is awesome"
print(s.title())  # Programming Is Awesome

7. Chunk a list into fixed‑size pieces

Splits a list into sub‑lists of a given size using math.ceil and map .

from math import ceil

def chunk(lst, size):
    return list(
        map(lambda x: lst[x * size:x * size + size],
            range(0, ceil(len(lst) / size))))

print(chunk([1,2,3,4,5], 2))  # [[1, 2], [3, 4], [5]]

8. Compact a list by removing falsy values

Filters out False , None , 0 , and empty strings.

def compact(lst):
    return list(filter(bool, lst))

print(compact([0,1,False,2,'',3,'a','s',34]))  # [1, 2, 3, 'a', 's', 34]

9. Unzip paired lists into separate tuples

Uses zip(*array) to transpose a list of pairs.

array = [['a','b'], ['c','d'], ['e','f']]
transposed = zip(*array)
print(list(transposed))  # [('a','c','e'), ('b','d','f')]

10. Chain comparisons

Demonstrates Python’s ability to compare multiple values in a single expression.

a = 3
print(2 < a < 8)   # True
print(1 == a < 2) # False

11. Join list elements with commas

Creates a single string from a list using ', '.join() .

hobbies = ["basketball", "football", "swimming"]
print("My hobbies are: " + ", ".join(hobbies))
# My hobbies are: basketball, football, swimming

12. Count vowels in a string

Uses a regular expression to count occurrences of a, e, i, o, u.

import re

def count_vowels(s):
    return len(re.findall(r'[aeiou]', s, re.IGNORECASE))

print(count_vowels('foobar'))  # 3
print(count_vowels('gym'))     # 0

13. Decapitalize the first character

Ensures the first character of a string is lower‑case.

def decapitalize(string):
    return string[:1].lower() + string[1:]

print(decapitalize('FooBar'))  # fooBar

14. Flatten a nested list (shallow)

Recursively expands nested lists into a single flat list.

def spread(arg):
    ret = []
    for i in arg:
        if isinstance(i, list):
            ret.extend(i)
        else:
            ret.append(i)
    return ret

def deep_flatten(lst):
    result = []
    result.extend(spread(list(map(lambda x: deep_flatten(x) if type(x) == list else x, lst))))
    return result

print(deep_flatten([1, [2], [[3], 4], 5]))  # [1,2,3,4,5]

15. List difference

Returns elements present in the first list but not in the second.

def difference(a, b):
    set_a = set(a)
    set_b = set(b)
    return list(set_a.difference(set_b))

print(difference([1,2,3], [1,2,4]))  # [3]

16. Difference by applying a function

Applies a function to the second list before computing the difference.

def difference_by(a, b, fn):
    b = set(map(fn, b))
    return [item for item in a if fn(item) not in b]

from math import floor
print(difference_by([2.1,1.2], [2.3,3.4], floor))  # [1.2]

17. Conditional function call in one line

Selects add or subtract based on a condition.

def add(a, b):
    return a + b

def subtract(a, b):
    return a - b

a, b = 4, 5
print((subtract if a > b else add)(a, b))  # 9

18. Check for duplicates in a list

Compares list length to the length of its set.

def has_duplicates(lst):
    return len(lst) != len(set(lst))

print(has_duplicates([1,2,3,4,5,5]))  # True

19. Merge two dictionaries (Python 3.5+)

Shows both the classic copy/update method and the dictionary unpacking syntax.

def merge_two_dicts(a, b):
    c = a.copy()
    c.update(b)
    return c

def merge_dictionaries(a, b):
    return {**a, **b}

print(merge_two_dicts({'x':1,'y':2}, {'y':3,'z':4}))
print(merge_dictionaries({'x':1,'y':2}, {'y':3,'z':4}))

20. Convert two lists into a dictionary

Uses zip to pair keys and values.

def to_dictionary(keys, values):
    return dict(zip(keys, values))

print(to_dictionary(['a','b','c'], [2,3,4]))  # {'a': 2, 'b': 3, 'c': 4}

21. Enumerate list with index

Iterates over a list while accessing both index and element.

lst = ["a","b","c","d"]
for index, element in enumerate(lst):
    print("Value", element, "Index", index)
# Value a Index 0 ...

22. Measure execution time

Uses time.time() to compute elapsed time for a code block.

import time
start_time = time.time()
# code to measure
end_time = time.time()
print("Time:", end_time - start_time)

23. Try/except with else clause

Runs the else block when no exception occurs.

try:
    2*3
except TypeError:
    print("An exception was raised")
else:
    print("Thank God, no exceptions were raised.")
# Thank God, no exceptions were raised.

24. Most frequent element in a list

Finds the element with the highest occurrence count.

def most_frequent(lst):
    return max(set(lst), key=lst.count)

print(most_frequent([1,2,1,2,3,2,1,4,2]))  # 2

25. Palindrome check

Normalizes a string and compares it to its reverse.

def palindrome(string):
    from re import sub
    s = sub(r'[\W_]', '', string.lower())
    return s == s[::-1]

print(palindrome('taco cat'))  # True

26. Operator dictionary for arithmetic without if‑else

Maps symbols to functions from the operator module.

import operator
action = {
    '+': operator.add,
    '-': operator.sub,
    '/': operator.truediv,
    '*': operator.mul,
    '**': pow,
}
print(action['-'](50, 25))  # 25

27. Shuffle a list (Fisher‑Yates)

Creates a shuffled copy of a list.

from copy import deepcopy
from random import randint

def shuffle(lst):
    temp_lst = deepcopy(lst)
    m = len(temp_lst)
    while m:
        m -= 1
        i = randint(0, m)
        temp_lst[m], temp_lst[i] = temp_lst[i], temp_lst[m]
    return temp_lst

print(shuffle([1,2,3]))  # e.g., [2,3,1]

28. Flatten a list (alternative implementation)

Same as snippet 14, demonstrating another spread function.

def spread(arg):
    ret = []
    for i in arg:
        if isinstance(i, list):
            ret.extend(i)
        else:
            ret.append(i)
    return ret

print(spread([1,2,3,[4,5,6],[7],8,9]))  # [1,2,3,4,5,6,7,8,9]

29. Swap two variables without a temporary variable

Returns the values in reversed order.

def swap(a, b):
    return b, a

a, b = -1, 14
print(swap(a, b))  # (14, -1)

30. Dictionary get with default value

Uses dict.get(key, default) to provide a fallback.

d = {'a': 1, 'b': 2}
print(d.get('c', 3))  # 3

The article concludes with a thank‑you note and promotional QR codes for a free Python public course, encouraging readers to scan for additional learning resources.