String manipulation

Remove unwanted whitespace from the beginning and end of a string.

Web forms: cleaning user input before validation; CSV processing: removing whitespace from fields after reading a line; Log parsing: trimming whitespace from log entries before pattern matching

Web forms, CSV processing, log parsing, any place where strings may contain incidental spaces or newlines.

string.strip()

... .strip()

object: any string‑like object (str)

• assignment to a variable
• use in conditionals
• passing to functions

• s.lstrip()
• s.rstrip()
• s.strip(chars)

Assuming strip modifies the original string; applying strip to None; expecting strip to remove internal whitespace.

s.lstrip() (removes leading whitespace), s.rstrip() (removes trailing whitespace), using regex re.sub for custom stripping.

Coming from languages with mutable string buffers (e.g., C, C++): expecting in‑place modification.

• string cleaning methods
• lstrip
• rstrip
• replace
• split

strip() removes whitespace characters (space, \t, \n, \r, \f, \v) from both ends; does not alter the original string; to strip specific characters, pass them as argument.

Guarantees clean input for comparison or storage, preventing bugs caused by inadvertent whitespace.

Think of strip as trimming the edges of a string like shaving off spaces.

strip() returns a new string; the original string remains unchanged.

s.strip(chars) for custom character sets or using re.sub(r'^\s+|\s+$', '', s) for more complex patterns.