Practice: Strings and f-strings¶

View practice code on GitHub Get the Video Course

Four practice problems, one per concept step; the numbers line up (Practice-01 goes with Step-01). Build each yourself, then check python-practice/solutions. Some problems end with a short input() "Write a Program" exercise.

Step-01: Making Strings¶

Concepts: strings, joining with +, len(), multiline strings.

Problem-1: Full Name.

Write a program that joins a first name (Srihan) and a last name (Reddy) into a full name with a space between them, prints the full name, and prints how many characters it has.

Srihan Reddy
12

first_name = "Srihan"
last_name = "Reddy"
full_name = first_name + " " + last_name
print(full_name)

print(len(full_name))

Problem-2: Multiline bio.

Write a program that prints a three-line bio from a single multiline string: Srihan Reddy, then Python Learner, then Chennai.

Srihan Reddy
Python Learner
Chennai

bio = """Srihan Reddy
Python Learner
Chennai"""
print(bio)

Pages for this step: Concept | Practice | Workshop

Python Files for this step: Concept | Practice | Practice Solutions | Workshop | Workshop Solutions

Step-02: f-strings¶

Concepts: f-strings, math inside braces, format specs.

Write a program that, using a name (Srihan), an age (27), and a price (2499.95) with f-strings:

• Task-1: print Hi Srihan, you are 27.
• Task-2: print Next year you will be 28 (the age plus 1).
• Task-3: print the price formatted with 2 decimals and a thousands separator as Price: 2,499.95.

Hi Srihan, you are 27
Next year you will be 28
Price: 2,499.95

name = "Srihan"
age = 27
price = 2499.95
# Task-1: print greeting with name and age
print(f"Hi {name}, you are {age}")

# Task-2: print next year's age
print(f"Next year you will be {age + 1}")

# Task-3: print price with 2 decimals and thousands separator
print(f"Price: {price:,.2f}")

Pages for this step: Concept | Practice | Workshop

Python Files for this step: Concept | Practice | Practice Solutions | Workshop | Workshop Solutions

Step-03: String Methods¶

Concepts: strip, upper, replace, input(), f-strings, len(), startswith/endswith, find/index.

Problem-1: Clean Up Text

Write a program that:

• Task-1: take a greeting " Hello World " (note the extra spaces) and print it with the surrounding spaces removed and in UPPER CASE.
• Task-2: take a date 2026-06-17 and print it with every - replaced by /.

HELLO WORLD
2026/06/17

greeting = "  Hello World  "
# Problem-1 Task-1: strip spaces and uppercase the greeting
print(greeting.strip().upper())
date = "2026-06-17"
# Problem-1 Task-2: replace dashes with slashes
print(date.replace("-", "/"))

Problem-2 (Write a Program): Name Tag.

Write a program that asks the user for a full name, then prints NAME TAG: <NAME> with the name in UPPER CASE and Characters: <count> with the number of characters in the name (spaces count).

Enter your full name: Kalyan Reddy
NAME TAG: KALYAN REDDY
Characters: 12

full_name = input("Enter your full name: ")
print(f"NAME TAG: {full_name.upper()}")
print(f"Characters: {len(full_name)}")

Problem-3: Is It A Number?

Write a program that prints whether "2026" is all digits and whether "20a6" is all digits.

True
False

print("2026".isdigit())
print("20a6".isdigit())

Problem-4: Ends and Position.

Write a program that:

• Task-1: for a filename data.csv, print whether it starts with data.
• Task-2: for the same filename, print whether it ends with .csv.
• Task-3: print the position of "ss" in "mississippi", found two ways.

True
True
2
2

filename = "data.csv"
# Problem-4 Task-1: check if filename starts with "data"
print(filename.startswith("data"))
# Problem-4 Task-2: check if filename ends with ".csv"
print(filename.endswith(".csv"))
# Problem-4 Task-3: find position of "ss" two ways
print("mississippi".find("ss"))
print("mississippi".index("ss"))

Pages for this step: Concept | Practice | Workshop

Python Files for this step: Concept | Practice | Practice Solutions | Workshop | Workshop Solutions

Step-04: Indexing and Slicing¶

Concepts: indexing, slicing, input(), step/reverse slices, immutability.

Problem-1

Write a program that, for the word Rocket:

• Task-1: print its first letter.
• Task-2: print its first 3 letters.
• Task-3: print its last 3 letters.

R
Roc
ket

word = "Rocket"
# Problem-1 Task-1: print the first letter
print(word[0])
# Problem-1 Task-2: print the first 3 letters
print(word[0:3])
# Problem-1 Task-3: print the last 3 letters
print(word[-3:])

Problem-2 (Write a Program):

Write a program that asks the user for a word and prints its first letter and its last letter.

Type a word: Mazda
M
a

typed = input("Type a word: ")
print(typed[0])
print(typed[-1])

Problem-3: Step and Reverse.

Write a program that, for the word Rocket:

• Task-1: print every second character.
• Task-2: print the word reversed.
• Task-3: print the word with its first letter changed to J (remember strings are immutable, so build a new string).

Rce
tekcoR
Jocket

word = "Rocket"
# Problem-3 Task-1: print every second character
print(word[::2])
# Problem-3 Task-2: print the word reversed
print(word[::-1])
# Problem-3 Task-3: build word with first letter changed to J
print("J" + word[1:])

Pages for this step: Concept | Practice | Workshop

Python Files for this step: Concept | Practice | Practice Solutions | Workshop | Workshop Solutions

Practice: Variables and Data Types Next: Practice: Operators Booleans and Conditionals