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Home/Questions/Python/Coding/Replace words and perform string operations in Python (replace, vowel removal, word count, pattern check).

Replace words and perform string operations in Python (replace, vowel removal, word count, pattern check).

Python/Codingmedium0.4 min readPremium
Frequency
Low
Asked at 1 company
Category
179
questions in Python/Coding
Difficulty Split
127E|24M|28H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Incedo
Key Concepts Tested
joinpython
Expert AnswerPremium
86 wordsInterview-ready
**Why String Ops in Data Eng:** Data cleaning (replace, normalize), validation (regex), feature extraction. Vectorized Pandas ops beat Python loops 10–100x. **Operations:** str.replace, re.sub for patterns; ''.join(c for c in s if c not in 'aeiou') for vowel removal; len(s.split()) or Counter for word count; re.match/re.search for pattern check. **Performance:** For 1M rows: df['col'].str.replace(r'\s+', ' ', regex=True) is vectorized. Precompile regex: pat = re.compile(r'...') for reuse....
The complete answer continues with detailed implementation patterns, architectural trade-offs, and production-grade considerations. It covers performance optimization strategies, common pitfalls to avoid, and real-world examples from companies like Incedo. The answer also includes follow-up discussion points that interviewers commonly explore.

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