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Challenges
2,500 Python challenges
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Replace Vowel With Another Character
Hard
Python
strings
regex
language_fundamentals
Remove the Letters ABC
Hard
Python
strings
loops
regex
The Collatz Conjecture
Hard
Python
algebra
algorithms
numbers
Functioninator 8000
Hard
Python
formatting
strings
Noddy's Mystery Function
Hard
Python
strings
validation
Positive Count / Negative Sum
Hard
Python
arrays
conditions
numbers
Double Letters
Hard
Python
strings
regex
validation
Reverse the Order of Words with Five Letters or More
Hard
Python
formatting
sorting
strings
Phone Number Formatting
Hard
Python
formatting
arrays
numbers
Even or Odd: Which is Greater?
Hard
Python
arrays
algorithms
language_fundamentals
Does a Number Exist?
Hard
Python
numbers
language_fundamentals
validation
Neatly Formatted Math
Hard
Python
strings
formatting
math
First and Last Index
Hard
Python
language_fundamentals
arrays
Magic Date
Hard
Python
dates
numbers
validation
Find Unique Positive Numbers from Array
Hard
Python
loops
numbers
formatting
Format VI: Padding
Hard
Python
formatting
strings
language_fundamentals
Changing Mixed Types
Hard
Python
arrays
conditions
Something in the Box?
Hard
Python
sorting
formatting
validation
RegEx XI-C: Whitespace Character Class
Hard
Python
regex
validation
Three Lists!
Hard
Python
arrays
interview
math
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