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In Python, strings are immutable sequences of characters, meaning they cannot be modified in-place. This raises the question of how to remove a specific character from a string.
String Termination
Unlike C strings, which are null-terminated, Python strings do not end with a special character. Their length is explicitly stored as a property of the string object.
Approaches to Character Removal
There are two common approaches to deleting characters from Python strings:
1. Replacing the Character
To remove all occurrences of a specific character, you can use the replace() method. For example, to remove the character 'M' from the string "EXAMPLE":
<code class="python">newstr = "EXAMPLE".replace("M", "")</code>
2. Creating a New String
To remove a specific character based on its position, you need to create a new string. You can approach this in two ways:
Shifting Characters:
Shift all characters to the right of the target character one position to the left. For the character at position midlen, the new string is:
<code class="python">newstr = oldstr[:midlen] + oldstr[midlen+1:]</code>
Concatenation:
Create a new string by concatenating the substring before the target character with the substring after it. For the character at position midlen, the new string is:
<code class="python">newstr = oldstr[:midlen-1] + oldstr[midlen+1:]</code>
The choice of approach depends on the specific requirements and performance considerations. For removing a single character from the middle of a long string, creating a new string with shifting may be more efficient.
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