Project: Username and Password Checker

Every signup form does two jobs: it turns a messy typed name into a tidy username, and it checks that a password is strong enough. You have all the string tools to build both.

What You'll Build

Step 1: Make a Username

Start from a name a user might type, with stray spaces and mixed case. Chain string methods to standardize it: trim the ends, lowercase it, and swap spaces for underscores.

Step 2: Check the Password

A strong password here needs three things: at least 8 characters, at least one digit, and at least one uppercase letter. The any(...) helper returns True if any character passes the test:

Combine the three checks with and: the password is strong only if all three are True.

Build It Yourself

Produce the exact two lines below.

Make It Your Own

Try a weak password and watch the result flip to False:

Challenge Ideas

• Print a specific reason when a password fails, like "needs a number"
• Also require a symbol such as ! or @
• Add a @example.com email built from the username

Key Takeaways

• Chain string methods to clean input in one readable line
• any(test for c in text) checks whether any character passes
• Combine boolean checks with and for an all-or-nothing rule
• Real forms are just cleaning and checking, which you can now do