String Manipulation Deep Dive

What does 'hello'.upper() return?

Which method removes whitespace from both ends?

What is 'Python'[::-1]?

Which method finds first occurrence of substring?

What does 'a,b,c'.split(',') return?

Which method replaces all occurrences?

What is ' hello '.strip()?

Which checks if string starts with prefix?

What does '-'.join(['a', 'b', 'c']) produce?

Which method returns string length?

Explain the difference between find() and index() methods.

What is string slicing? Explain start:stop:step with examples.

Differentiate between isalpha(), isdigit(), and isalnum().

Explain the join() method. Why is it preferred over string concatenation in loops?

What are f-strings? How do they improve string formatting?

Explain the difference between capitalize(), title(), and upper().

What is the zfill() method? When is it useful?

Explain partition() and rpartition() methods with examples.

What is string interning? Why does Python do it?

Explain maketrans() and translate() methods for character replacement.

Write a program to check if a string is a palindrome (ignoring case and spaces).

Create a program to count vowels, consonants, digits, and special characters.

Write a program to find the longest word in a sentence.

Create a Caesar cipher program to encrypt/decrypt text.

Write a program to format a number as currency (e.g., $1,234.56).

Create a password validator (min 8 chars, upper, lower, digit, special).

Predict output: s = 'hello' print(s[1:4]) print(s[:3]) print(s[3:])

Find error: text = 'hello' text[0] = 'H' print(text)

Predict output: words = ['Python', 'is', 'fun'] print(' '.join(words)) print('-'.join(words))

Find error: print('Value: %d' % '5')

Predict output: s = 'hello world' print(s.find('o')) print(s.rfind('o')) print(s.find('z'))

Find error: name = 'john' print(name.capitalize()) print(name)

Predict output: s = 'abc123' print(s.isalnum()) print(s.isalpha()) print(s.isdigit())

Find error: result = 'hello'.split('')