Strings

What this module covers

By the end of it

• Create strings with single, double, triple quotes and raw strings, and choose correctly
• Index and slice strings confidently, including negative indices and strides
• Explain string immutability and its performance consequences
• Apply the string methods that do most real cleaning work: .strip(), .split(),
• Format output precisely with f-strings: alignment, precision, thousands separators, dates
• Choose between .join() and += for building strings, and justify it with a benchmark
• Handle Unicode, encodings, and the invisible characters that break real datasets
• Recognise when a problem needs a regular expression rather than a string method