Python Practice Problems

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

Split on the last delimiter

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Python Practice › String Programs › Program 67

Split on the last delimiter

EasyString Programs · 67 of 106

Write a Python program to split a string on the last occurrence of a delimiter.

Input
"l,e,a,r,n,I,n,g,p,y,t,h,o,n"
Output
['l,e,a,r,n,I,n,g,p,y,t,h,o', 'n']

Approach

  1. rsplit(",", 1) splits once, from the right.

Solution

Python
text = "l,e,a,r,n,I,n,g,p,y,t,h,o,n"print(text.rsplit(",", 1))
Output
['l,e,a,r,n,I,n,g,p,y,t,h,o', 'n']

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Count and show vowels

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Python Practice › String Programs › Program 66

Count and show vowels

EasyString Programs · 66 of 106

Write a Python program to count and display the vowels in a string.

Input
"welcome to Sqatools"
Output
['e', 'o', 'e', 'o', 'a', 'o', 'o'] 7

Approach

  1. Collect the vowels in a list.

Solution

Python
text = "welcome to Sqatools"vowels = [ch for ch in text if ch.lower() in "aeiou"]print(vowels, len(vowels))
Output
['e', 'o', 'e', 'o', 'a', 'o', 'o'] 7

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More string programs

#67EasySplit on the last delimiter#68EasyFirst repeated word#69EasySecond most repeated word#70EasyRemove all spaces

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Swap commas and dots

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Python Practice › String Programs › Program 65

Swap commas and dots

EasyString Programs · 65 of 106

Write a Python program to swap commas and dots.

Input
"sqa,tools.python"
Output
sqa.tools,python

Approach

  1. translate with a two-way mapping swaps them in one pass.

Solution

Python
text = "sqa,tools.python"print(text.translate(str.maketrans(",.", ".,")))
Output
sqa.tools,python

Line by line

Line 2

maketrans(",.", ".,") maps , to . and . to , at the same time; two replace calls would undo each other.

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More string programs

#66EasyCount and show vowels#67EasySplit on the last delimiter#68EasyFirst repeated word#69EasySecond most repeated word

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String to a list of words

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Python Practice › String Programs › Program 64

String to a list of words

EasyString Programs · 64 of 106

Write a Python program to convert a string into a list of words.

Input
"learning python is fun"
Output
['learning', 'python', 'is', 'fun']

Approach

  1. split().

Solution

Python
print("learning python is fun".split())
Output
['learning', 'python', 'is', 'fun']

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More string programs

#65EasySwap commas and dots#66EasyCount and show vowels#67EasySplit on the last delimiter#68EasyFirst repeated word

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Does a string contain every letter?

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Python Practice › String Programs › Program 63

Does a string contain every letter?

EasyString Programs · 63 of 106

Write a Python program to check whether a string contains all letters of the alphabet (a pangram).

Input
"abcdgjksoug", "The quick brown fox jumps over the lazy dog"
Output
False
True

Approach

  1. Compare the set of letters with string.ascii_lowercase.

Solution

Python
import string for text in ["abcdgjksoug", "The quick brown fox jumps over the lazy dog"]:    print(set(string.ascii_lowercase) <= set(text.lower()))
Output
False
True

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Strip spaces

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Python Practice › String Programs › Program 62

Strip spaces

EasyString Programs · 62 of 106

Write a Python program to remove leading and trailing spaces.

Input
"    sqaltoolspythonfun     "
Output
'sqaltoolspythonfun' 'sqaltoolspythonfun     ' '    sqaltoolspythonfun'

Approach

  1. strip(); lstrip() / rstrip() for one side.

Solution

Python
text = "    sqaltoolspythonfun     "print(repr(text.strip()), repr(text.lstrip()), repr(text.rstrip()))
Output
'sqaltoolspythonfun' 'sqaltoolspythonfun     ' '    sqaltoolspythonfun'

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Index of a character

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Python Practice › String Programs › Program 61

Index of a character

EasyString Programs · 61 of 106

Write a Python program to print the index of a character in a string.

Input
"Sqatools", "q"
Output
The index of q is 1

Approach

  1. find() returns the first index (or -1).

Solution

Python
text = "Sqatools"ch = "q"print(f"The index of {ch} is {text.find(ch)}")
Output
The index of q is 1

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Frequency of every substring

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Python Practice › String Programs › Program 60

Frequency of every substring

MediumString Programs · 60 of 106

Write a Python program to count every substring of a string.

Input
"abab"
Output
{'a': 2, 'ab': 2, 'aba': 1, 'abab': 1, 'b': 2, 'ba': 1, 'bab': 1}

Approach

  1. Two nested loops pick every start and end position.

Solution

Python
text = "abab"freq = {}for i in range(len(text)):    for j in range(i + 1, len(text) + 1):        sub = text[i:j]        freq[sub] = freq.get(sub, 0) + 1print(freq)
Output
{'a': 2, 'ab': 2, 'aba': 1, 'abab': 1, 'b': 2, 'ba': 1, 'bab': 1}

Line by line

Lines 3-5

text[i:j] visits every substring once: “a”, “ab”, “aba”, “abab”, “b”, …

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Is a substring present?

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Python Practice › String Programs › Program 59

Is a substring present?

EasyString Programs · 59 of 106

Write a Python program to check whether a substring is present in a string.

Input
"I live in Pune", "I live "
Output
Yes

Approach

  1. Use in.

Solution

Python
text = "I live in Pune"print("Yes" if "I live " in text else "No")
Output
Yes

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More string programs

#60MediumFrequency of every substring#61EasyIndex of a character#62EasyStrip spaces#63EasyDoes a string contain every letter?

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Random binary string

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Python Practice › String Programs › Program 58

Random binary string

EasyString Programs · 58 of 106

Write a Python program to generate a random binary string of a given length.

Input
8
Output
00110011

Approach

  1. Pick “0” or “1” for each position.

Solution

Python
import random random.seed(3)n = 8print("".join(random.choice("01") for _ in range(n)))
Output
00110011

Line by line

Line 3

The seed makes the output repeatable; remove it for a new string each run.

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