# List comprehension and ord() in Python to remove all characters other than alphabets

• Difficulty Level : Basic
• Last Updated : 04 Jul, 2022

Given a string consisting of alphabets and other characters, remove all the characters other than alphabets and print the string so formed. Examples:

```Input : str = "\$Gee*k;s..fo, r'Ge^eks?"
Output : GeeksforGeeks```

This problem has existing solution please refer Remove all characters other than alphabets from string link. We will solve this problem in python quickly using List Comprehension. Approach : is

```1. Traverse string
2. Select characters which lie in range of [a-z] or [A-Z]
3. Print them together```

How does ord() and range() function works in python ?

• The ord() method returns an integer representing the Unicode code point of the given Unicode character.For example,
` ord('5') = 53 and ord('A') = 65 and ord('\$') = 36`
• The range(a,b,step) function generates a list of elements which ranges from a inclusive to b exclusive with increment/decrement of given step.

## Python3

 `# Python code to remove all characters``# other than alphabets from string` `def` `removeAll(``input``):` `    ``# Traverse complete string and separate``    ``# all characters which lies between [a-z] or [A-Z]``    ``sepChars ``=` `[char ``for` `char ``in` `input` `if``ord``(char) ``in` `range``(``ord``(``'a'``),``ord``(``'z'``)``+``1``,``1``) ``or` `ord``(char) ``in``range``(``ord``(``'A'``),``ord``(``'Z'``)``+``1``,``1``)]` `    ``# join all separated characters``    ``# and print them together``    ``return` `''.join(sepChars)` `# Driver program``if` `__name__ ``=``=` `"__main__":``    ``input` `=` `"\$Gee``*``k;s..fo, r'Ge^eks?"``    ``print` `(removeAll(``input``))`

Output:

`GeeksforGeeks`

## Python3

 `# code``string ``=` `"\$Gee*k;s..fo, r'Ge^eks?"``print``("".join(``filter``(``lambda` `x : x.isalpha(),string)))`

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