String values and text handling in Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this string slicing code?

Consider the following Python code that slices a string. What will be printed?

Python

text = "Programming"
print(text[3:8])

A "gramm"

B "gram"

C "grammi"

D "ogram"

💡 Hint

Remember that string slicing includes the start index but excludes the end index.

The slice text[3:8] starts at index 3 ('g') and goes up to but not including index 8 ('i'), so it includes characters at indices 3,4,5,6,7 which form 'gramm'.

❓ Predict Output

intermediate

What does this code print with string methods?

What is the output of this Python code that uses string methods?

Python

s = "  Hello World  "
print(s.strip().lower().replace(' ', '_'))

A "hello world"

B " hello_world "

C "hello_world"

D "Hello_World"

💡 Hint

strip() removes spaces at both ends, lower() makes all letters lowercase, replace() changes spaces inside the string.

strip() removes leading and trailing spaces, lower() converts all letters to lowercase, and replace(' ', '_') changes spaces to underscores, resulting in 'hello_world'.

❓ Predict Output

advanced

What is the output of this multiline string and escape sequence code?

What will this Python code print?

Python

text = '''Line1\nLine2\tTabbed'''
print(text)

A Line1\nLine2\tTabbed

B

Line1
Line2	Tabbed

C

Line1
Line2\tTabbed

D Line1\nLine2 Tabbed

💡 Hint

Triple quotes preserve backslashes as literal characters unless raw strings are used.

Using triple quotes with normal string (not raw) and escaped backslashes means the string contains literal backslash characters followed by n and t, so print outputs them as \n and \t.

❓ Predict Output

advanced

What is the output of this f-string with expressions?

What will this Python code print?

Python

name = "Alice"
age = 30
print(f"Name: {name.upper()}, Age next year: {age + 1}")

A Name: ALICE, Age next year: 31

B Name: alice, Age next year: 31

C Name: ALICE, Age next year: 30

D Name: Alice, Age next year: 31

💡 Hint

f-strings evaluate expressions inside curly braces before printing.

name.upper() converts 'Alice' to 'ALICE', and age + 1 calculates 31, so the output is 'Name: ALICE, Age next year: 31'.

❓ Predict Output

expert

What is the output of this complex string manipulation code?

What will this Python code print?

Python

s = "abracadabra"
result = ''.join([c.upper() if i % 2 == 0 else c for i, c in enumerate(s)])
print(result)

A aBrAcAdAbRa

B abracadabra

C ABRACADABRA

D AbRaCaDaBrA

💡 Hint

The code changes characters at even positions to uppercase and leaves odd positions unchanged.

enumerate gives index and character; for even indices (0,2,4...), character is uppercased; for odd indices, character stays the same. So the output is 'AbRaCaDaBrA'.

Practice

1. What is the correct way to create a string in Python?

easy

A. Using quotes like "Hello" or 'Hello'

B. Using parentheses like (Hello)

C. Using curly braces like {Hello}

D. Using square brackets like [Hello]

Solution

1. Step 1: Understand string syntax in Python

   Strings are text and must be enclosed in quotes, either single or double.

2. Step 2: Check each option

   Only Using quotes like "Hello" or 'Hello' uses quotes correctly. Parentheses, curly braces, and square brackets are for other data types.

3. Final Answer:

   Using quotes like "Hello" or 'Hello' -> Option A

4. Quick Check:

   Strings need quotes = C [OK]

Hint: Remember: strings always need quotes around text [OK]

Common Mistakes:

• Using parentheses instead of quotes
• Confusing brackets with quotes
• Forgetting to close quotes

2. Which of the following is the correct syntax to create a multi-line string in Python?

easy

A. '''This is a multi-line string'''

B. "This is a multi-line string"

C. 'This is a multi-line string'

D. --This is a multi-line string--

Solution

1. Step 1: Recall multi-line string syntax

   Python uses triple quotes (either ''' or """) to create strings that span multiple lines.

2. Step 2: Evaluate options

   '''This is a multi-line string''' uses triple single quotes correctly. Options B and C use single or double quotes for single-line strings. --This is a multi-line string-- is invalid syntax.

3. Final Answer:

   '''This is a multi-line string''' -> Option A

4. Quick Check:

   Triple quotes = multi-line string [OK]

Hint: Use triple quotes for multi-line strings [OK]

Common Mistakes:

• Using single or double quotes for multi-line text
• Using invalid symbols like --
• Not closing triple quotes properly

3. What will be the output of the following code?

text = "Hello World"
print(text[6:])

medium

A. Hello

B. World

C. World!

D. Hello World

Solution

1. Step 1: Understand string slicing

   text[6:] means start from index 6 to the end of the string. Indexing starts at 0.

2. Step 2: Identify substring from index 6

   In "Hello World", index 6 is 'W', so text[6:] is "World".

3. Final Answer:

   World -> Option B

4. Quick Check:

   text[6:] = World [OK]

Hint: Remember string index starts at 0; slice from index 6 to end [OK]

Common Mistakes:

• Confusing index start point
• Including extra characters like '!'
• Printing entire string instead of slice

4. Find the error in this code snippet:

name = 'Alice
print(name)

medium

A. Incorrect use of newline character

B. print() function is misspelled

C. Missing closing quote for the string

D. Variable name is invalid

Solution

1. Step 1: Check string syntax

   The string starts with a single quote but does not have a closing quote before the newline.

2. Step 2: Identify syntax error

   Because the closing quote is missing, Python will raise a syntax error.

3. Final Answer:

   Missing closing quote for the string -> Option C

4. Quick Check:

   Unclosed string causes syntax error [OK]

Hint: Always close your quotes before newline or end [OK]

Common Mistakes:

• Forgetting to close quotes
• Thinking newline character causes error
• Assuming print is misspelled

5. You have a list of words: words = ['apple', 'banana', 'cherry']. Which code correctly joins them into a single string separated by commas?

hard

A. result = ','.join([words])

B. result = words.join(',')

C. result = ','.join('words')

D. result = ','.join(words)

Solution

1. Step 1: Understand join() method usage

   The join() method is called on the string separator and takes an iterable of strings as argument.

2. Step 2: Check each option

   result = ','.join(words) correctly calls join on the comma string with the list words. Others misuse join or pass wrong arguments.

3. Final Answer:

   result = ','.join(words) -> Option D

4. Quick Check:

   Separator.join(list) joins list items [OK]

Hint: Call join on separator string, pass list to join() [OK]

Common Mistakes:

• Calling join on the list instead of the string
• Passing string 'words' instead of list variable
• Passing list inside another list