Python String Interviews
18 lessons. From string fundamentals to Unicode, parsers, tries, and dynamic programming.
For learners who know variables, loops, and functions. Written lessons, at your own pace.
Both language courses are included in the course purchase.
01Python’s string modelDistinguish characters, code points, and immutable strings before solving a problem.Free preview02Indexing and slicingUse half-open intervals and slices without losing boundary cases.Free preview03Methods and normalizationSelect string methods whose behavior matches the specification.Course04Complexity and efficient constructionAccount for scans, copies, and output while constructing strings efficiently.Course05Frequency mapsUse counts and last positions to separate character identity from ordering.Course06Two pointers, one clear invariantRecognize and solve palindrome-style problems with a precise invariant.Course07Sliding windowsMaintain a valid contiguous window without rescanning it from scratch.Course08Parsing and validationUse a scan or stack to parse structured text and validate nesting.Course09Anagrams and groupingBuild canonical keys for equivalence classes without losing required order.Course10Substring searchHandle overlapping matches and understand when a linear search algorithm is needed.Course11Choosing a solution patternSelect a technique from the structure of the problem instead of memorizing titles.Course12Interview walkthroughExplain, implement, test, and refine a solution under interview conditions.Course13Unicode and comparison policiesDistinguish code points from visible characters, choose normalization deliberately, and retain original text alongside comparison keys.Course14Regular expressions with a contractWrite a small ASCII grammar, validate the entire input, and recognize when a parser is clearer than a regular expression.Course15Quoting, escaping, and nested inputModel quoted and escaped input as explicit states, preserve empty fields, and use a stack for nested structures.Course16Tries and prefix queriesBuild a prefix tree, distinguish prefix presence from complete words, and choose a trie only when the query workload justifies it.Course17Streaming across chunk boundariesCarry minimal state across chunks, count words without concatenation, and apply prefix matching when a pattern crosses boundaries.Course18Dynamic programming for string choicesDefine prefix states, derive transitions from the final choice, handle empty prefixes, and reduce memory without changing dependency order.Course
Learn it. Then put it to work.
Pair the course with 60 Python challenges, progressive hints, and worked solutions.
Explore the complete bundle