Python: Remove Non-printable characters from string

Current post is on how to remove non-printable characters from string.

Need a function to remove non-printable characters in python.

Remove Non-printable function for ASCII String:

def    remove_ascii_non_printable(str)
      """Removes Non-printable chars from ASCII String"""
      return ''.join([ch for ch in str if ord(ch) > 31 and ord(ch) < 126 or ord(c) = = 9])

Remove Non-printable function for Unicode String:

def    remove_unicode_non_printable(str)
      """Removes Non-printable chars from ASCII String"""
      return ''.join([ch for ch in str if ord(ch) > 31 or ord(c) = = 9])



Appreciate your feedback via comments.

Thanks.

Non-Printable Char to int Conversion Issue in C

Current post is on non-printable character conversion to int issue in C language.

By the topic you will assume, what is this? Even a C student who has just started will know that, there is no harm, as we are upgrading the type from character (char) to integer (int).

However, many people including the advanced programmer do not know is that: “conversion of character having non-printable value to int is machine dependent”.

It means that if you take a variable:

char mynonprintablechar = 129;

And then you try to upgrade to int implicitly, the results which you get, will make you scratch your hair.

Example 1: If - Else Statement

if( mynonprintablechar == 129)
     printf(“You expected me”);

else

     printf(“You may get me”);

Example 2: Switch Statement

switch(mynonprintablechar)
{
    case 129:
        printf(“You expected me”);
        break;
    default:
        printf(“You may get me”);
}

The solution:

1. Have unsigned char as variable type.
2. downcast the int against which you compare to char.
3. cast as unsigned char.

Do drop me a mail, if I saved you from scratching your hair :)