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

Python Methods and Functions

If a string consisting of alphabets and other characters is given, remove all characters except alphabets and print the generated string.
Examples:

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

This problem has an existing solution, please refer to List Comphetsion
Approach: yes

` 1. Traverse string 2. Select characters which lie in range of [az] or [AZ] 3. Print them together `

How do ord () and range () functions in python?

• The ord () method returns an integer that represents 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 that ranges from inclusive to exclusive b, increasing / decreasing the given step.

 ` # Python code to remove all characters ` ` # except alphabets from string `   ` def ` ` removeAll (` ` input ` `): ` ` `  ` # Pass the full line and separate ` ` # all characters between [az] or [AZ] ` ` ` ` 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 ` `)] `   ` # concatenate all delimited 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:

` Python.Engineering `