Python Practice Problems

Python practice problems help beginners to become experts in a python programming language with a small amount of practice effort.

Remove duplicate words

by
Python Practice › String Programs › Program 20

Remove duplicate words

EasyString Programs · 20 of 106

Write a Python program to remove duplicate words (ignoring case) and keep the first occurrence.

Input
"John jany sabi row john sabi"
Output
John jany sabi row

Approach

  1. Track lower-cased words already seen.

Solution

Python
text = "John jany sabi row john sabi"seen = set()result = []for w in text.split():    if w.lower() not in seen:        seen.add(w.lower())        result.append(w)print(" ".join(result))
Output
John jany sabi row

Line by line

Line 5

Comparing lower-cased words treats “John” and “john” as the same.

Learn the concept

New to this topic? Read the lesson, then come back.

More string programs

#21EasyRemove unwanted characters#22EasyLongest all-capital word#23EasyCommon words in two strings#24EasySmallest and largest word

← All 106 String Programs

Build a sentence from a list of words

by
Python Practice › String Programs › Program 19

Build a sentence from a list of words

EasyString Programs · 19 of 106

Write a Python program to create a string from a list of words.

Input
["There", "are", "Many", "Programming", "Language"]
Output
There are Many Programming Language

Approach

  1. " ".join(words).

Solution

Python
words = ["There", "are", "Many", "Programming", "Language"]print(" ".join(words))
Output
There are Many Programming Language

Line by line

Line 2

join puts the separator (a space) between the words.

Learn the concept

New to this topic? Read the lesson, then come back.

More string programs

#20EasyRemove duplicate words#21EasyRemove unwanted characters#22EasyLongest all-capital word#23EasyCommon words in two strings

← All 106 String Programs

Palindrome words in a string

by
Python Practice › String Programs › Program 18

Palindrome words in a string

EasyString Programs · 18 of 106

Write a Python program to get all palindrome words from a string.

Input
"Python efe language aakaa hellolleh"
Output
['efe', 'aakaa', 'hellolleh']

Approach

  1. Keep words equal to their reverse.

Solution

Python
text = "Python efe language aakaa hellolleh"print([w for w in text.split() if w.lower() == w.lower()[::-1]])
Output
['efe', 'aakaa', 'hellolleh']

Learn the concept

New to this topic? Read the lesson, then come back.

More string programs

#19EasyBuild a sentence from a list of words#20EasyRemove duplicate words#21EasyRemove unwanted characters#22EasyLongest all-capital word

← All 106 String Programs

Replace Java with Python, any case

by
Python Practice › String Programs › Program 17

Replace Java with Python, any case

EasyString Programs · 17 of 106

Write a Python program to replace the word “Java” (in any letter case) with “Python”.

Input
"JAVA is the Best Programming Language in the Market"
Output
Python is the Best Programming Language in the Market

Approach

  1. str.replace is case-sensitive, so use re.sub with re.IGNORECASE.

Solution

Python
import re text = "JAVA is the Best Programming Language in the Market"print(re.sub(r"\bjava\b", "Python", text, flags=re.IGNORECASE))
Output
Python is the Best Programming Language in the Market

Line by line

Line 4

\b matches whole words only, and the flag ignores case.

Learn the concept

New to this topic? Read the lesson, then come back.

More string programs

#18EasyPalindrome words in a string#19EasyBuild a sentence from a list of words#20EasyRemove duplicate words#21EasyRemove unwanted characters

← All 106 String Programs

Extract all numbers from a string

by
Python Practice › String Programs › Program 16

Extract all numbers from a string

EasyString Programs · 16 of 106

Write a Python program to get all the numbers from a multi-line string.

Input
a paragraph containing 1112, 1773, 444, 5324 and 555
Output
[1112, 1773, 444, 5324, 555]

Approach

  1. Use re.findall(r"\d+", text) and convert each match to int.

Solution

Python
import re text = """Sinak's 1112 aim is to 1773 create a new generation of people whounderstand 444 that an organization's 5324 success or failure isbased on 555 leadership excellence and not managerial acumen"""numbers = [int(n) for n in re.findall(r"\d+", text)]print(numbers)
Output
[1112, 1773, 444, 5324, 555]

Line by line

Line 6

\d+ matches each run of digits; the list comprehension converts them to integers.

Note

The original sample output listed 5324 twice and missed 444; the real numbers in the text are shown here.

Learn the concept

New to this topic? Read the lesson, then come back.

More string programs

#17EasyReplace Java with Python, any case#18EasyPalindrome words in a string#19EasyBuild a sentence from a list of words#20EasyRemove duplicate words

← All 106 String Programs

Reverse the order of words

by
Python Practice › String Programs › Program 15

Reverse the order of words

EasyString Programs · 15 of 106

Write a Python program to rearrange a sentence so its words appear in reverse order.

Input
"Cricket Plays Virat"
Output
Virat Plays Cricket

Approach

  1. Split, reverse the list, join.

Solution

Python
text = "Cricket Plays Virat"print(" ".join(text.split()[::-1]))
Output
Virat Plays Cricket

Learn the concept

New to this topic? Read the lesson, then come back.

More string programs

#16EasyExtract all numbers from a string#17EasyReplace Java with Python, any case#18EasyPalindrome words in a string#19EasyBuild a sentence from a list of words

← All 106 String Programs

Vowel count of each word

by
Python Practice › String Programs › Program 13

Vowel count of each word

EasyString Programs · 13 of 106

Write a Python program to count the vowels in each word and show the result as a dictionary.

Input
"We are Learning Python Codding"
Output
{'We': 1, 'are': 2, 'Learning': 3, 'Python': 1, 'Codding': 2}

Approach

  1. A dict comprehension maps each word to its vowel count.

Solution

Python
text = "We are Learning Python Codding"counts = {w: sum(ch in "aeiouAEIOU" for ch in w) for w in text.split()}print(counts)
Output
{'We': 1, 'are': 2, 'Learning': 3, 'Python': 1, 'Codding': 2}

Line by line

Line 2

ch in "aeiouAEIOU" is True or False; sum() counts the Trues.

Learn the concept

New to this topic? Read the lesson, then come back.

More string programs

#14MediumRepeat vowels 3 times and consonants 2 times#15EasyReverse the order of words#16EasyExtract all numbers from a string#17EasyReplace Java with Python, any case

← All 106 String Programs

Swap first and last letters of each word

by
Python Practice › String Programs › Program 12

Swap first and last letters of each word

EasyString Programs · 12 of 106

Write a Python program to exchange the first and last characters of every word in a string.

Input
"Its Online Learning"
Output
stI enlinO gearninL

Approach

  1. Split, swap each word, join again.

Solution

Python
def swap(word):    return word if len(word) < 2 else word[-1] + word[1:-1] + word[0] text = "Its Online Learning"print(" ".join(swap(w) for w in text.split()))
Output
stI enlinO gearninL

Line by line

Line 2

One-letter words are returned unchanged.

Learn the concept

New to this topic? Read the lesson, then come back.

More string programs

#13EasyVowel count of each word#14MediumRepeat vowels 3 times and consonants 2 times#15EasyReverse the order of words#16EasyExtract all numbers from a string

← All 106 String Programs

Swap the first and last characters

by
Python Practice › String Programs › Program 11

Swap the first and last characters

EasyString Programs · 11 of 106

Write a Python program to swap the first and last characters of a string.

Input
"SqaTool"
Output
lqaTooS

Approach

  1. Build last + middle + first.

Solution

Python
text = "SqaTool"swapped = text[-1] + text[1:-1] + text[0] if len(text) > 1 else textprint(swapped)
Output
lqaTooS

Line by line

Line 2

text[1:-1] is everything between the first and last characters.

Note

The original sample showed “IqaTooS” with a capital I, but swapping keeps the original letters, so the result is “lqaTooS”.

Learn the concept

New to this topic? Read the lesson, then come back.

More string programs

#12EasySwap first and last letters of each word#13EasyVowel count of each word#14MediumRepeat vowels 3 times and consonants 2 times#15EasyReverse the order of words

← All 106 String Programs

String length with a loop

by
Python Practice › String Programs › Program 9

String length with a loop

EasyString Programs · 9 of 106

Write a Python program to calculate the length of a string with a loop instead of len().

Input
"sqatools"
Output
8 True

Approach

  1. Count the characters one by one.

Solution

Python
text = "sqatools"count = 0for _ in text:    count += 1print(count, count == len(text))
Output
8 True

Learn the concept

New to this topic? Read the lesson, then come back.

More string programs

#10MediumReplace the second occurrence of each character#11EasySwap the first and last characters#12EasySwap first and last letters of each word#13EasyVowel count of each word

← All 106 String Programs