Build practical mini‑projects that reinforce Python variable concepts—covering declaration, assignment, scope, naming, and debugging through real‑world challenges.
This project simulates creating a simple user profile where the information can change, showcasing the flexibility of variables in Python.
Create a Python script that stores user profile information (username, age, and a special status) in variables. You will then update these variables to demonstrate how their types can change (dynamic typing) and how to represent an “empty” or unassigned status using None.
First, let’s create variables to hold the user’s information. This covers variable basics.
# 1. Create a variable to store a username.
# A string is a good choice for text.
username = "CodeWizard"
# 2. Create a variable for the user's age.
# An integer is used for whole numbers.
age = 16
# 3. Create a variable for a special status.
# Let's start with it being empty.
special_status = None
# Now, print the initial profile information.
print("--- Initial User Profile ---")
print("Username:", username)
print("Age:", age)
print("Special Status:", special_status)
print("Type of 'special_status':", type(special_status))
What’s happening here?
username, age, and special_status.username, an integer to age, and the special keyword None to special_status. None is used to signify the absence of a value.Now, imagine the user has earned a special badge! We will update the special_status variable. This demonstrates dynamic typing, where a variable can hold different data types.
# The user just earned a "Gold" status!
# Let's update the 'special_status' variable.
print("\n--- Profile Updated! ---")
# This is where dynamic typing happens!
# The 'special_status' variable is about to change from NoneType to a string.
special_status = "Gold Member"
# The user also had a birthday. Let's update their age.
age = age + 1 # Or you can write age += 1
# Print the updated profile.
print("Username:", username)
print("Age:", age)
print("Special Status:", special_status)
print("New type of 'special_status':", type(special_status))
What’s happening here?
special_status variable, which was previously None (type NoneType), now holds the string "Gold Member" (type str). Python automatically handles this change in data type. This is dynamic typing.age by performing a basic calculation.Here is the complete script. You can copy and paste this into a Python file (e.g., profile.py) and run it.
# --- Step 1: Create the Initial Profile ---
# Create variables for the user profile.
username = "CodeWizard"
age = 16
special_status = None # Use None for an empty or unassigned value
# Print the initial profile information.
print("--- Initial User Profile ---")
print("Username:", username)
print("Age:", age)
print("Special Status:", special_status)
print("Type of 'special_status':", type(special_status))
print("-" * 20) # A separator line for clarity
# --- Step 2: Update the Profile (Dynamic Typing) ---
print("\n--- Profile Updated! ---")
# The 'special_status' variable changes from NoneType to a string.
special_status = "Gold Member"
# The user's age is updated.
age = age + 1
# Print the new profile details.
print("Username:", username)
print("Age:", age)
print("Special Status:", special_status)
print("New type of 'special_status':", type(special_status))
print("-" * 20)