DynamicVibePython learning
How to study · reference & help

One lesson at a time

Read the idea, then follow the named exercise steps. On a phone, use Idea, Code and Output to switch views. Review days begin with recall before the rebuild. A self-review mark is not a scored answer.

Run, inspect, repair

Run loads Python in your browser on the first use, so you need an internet connection. Read Output and the check result. Stop interrupts a run; it keeps your code. Reset restores the selected starter, replacing that exercise’s draft. Use an authored hint before asking for help.

Keep your work

Code drafts, progress and Notes save on this device when browser storage is available. They do not sync through your login. Use Backup & records above to download saved learning records, preview an import or undo the latest import. Copy unsaved text first; clearing browser data can remove local work. A save warning means you should copy your work before leaving.

Practice files and reports

Each browser Run starts in a fresh temporary workspace. A sample file exists only when that run’s code creates it; these are not your computer’s files. On report tasks, use Preview to inspect the actual text and Download to request a copy before another Run, Reset, exercise change or leaving. Reports do not save through tutor login. Read files and write reports.

Get tutoring when you need it

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Python words in plain language

Assignment and type
frames = 96 binds a name to an integer. "96" is text, not the same numeric value. Values and names.
List and index
A list keeps items in order. Positions start at zero; the final nonnegative index is length minus one. List lookups.
Loop and indentation
A for loop processes each item. Indentation groups its repeated statements; a statement outside the block runs separately. Loops.
Parameter, argument and Return
A parameter names an input in a definition; an argument supplies its value in a call. Return gives a result to the caller; print displays it. A function that only prints returns None. Functions.
Dictionary and schema
A dictionary labels values with keys. A schema states the required fields and types; a missing fact is not automatically zero. Dictionaries · Validation.
File, CSV and JSONL
A file stores bytes/text. CSV needs a quoting-aware parser; JSONL contains one JSON value per line. Browser practice files are temporary, not computer files. CSV · JSONL.
Denominator and evidence
A rate divides a count by its declared eligible total. Keep exclusions visible. A quiz score, practical check and self-review are different evidence. Quality rates.

Read the error, then make one repair

SyntaxError / IndentationError
Python could not parse the code. Inspect the named line and the preceding line for a missing colon, unmatched quote/bracket or inconsistent indentation. Review blocks.
NameError
A name has no value here. Compare case and spelling, and check that assignment happens before use. Do not replace an unknown parameter with a fixed sample.
TypeError / ValueError
A wrong kind of value or an unacceptable value can fail an operation. Inspect the supplied input and declared policy; do not broadly suppress the error. Narrow error handling.
IndexError / KeyError
The requested position or key is missing. Inspect the collection and interface instead of guessing a fallback. Indices · Keys.
Run stays loading / runtime or checker unavailable
This is not proof that your answer is wrong. Stop if available, copy your draft, check your connection and retry. If it repeats, keep the visible error and use the readable lesson/hints. Never reset or clear browser storage as the first repair.
Expected sample prints, but a check fails
Read the named contract and test changed/empty inputs. The helper may return None, use a fixed value or stop too early even when the sample looks right. A failed check is not a request to copy the expected output.

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← Route Week 3 · Day 11 of 40

String tools

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Lesson idea Tap to fold
Recall

Without looking back: what does a list index of 0 retrieve?

Show the answer

The first item. Python starts counting positions at zero.

Today

Clean a copy; keep the original evidence

Clip names arrive as strings: text, even when some characters look like numbers. A method is an operation called on a value using a dot and parentheses. strip() removes outside whitespace, lower() changes letter case, and replace(old, new) replaces matching text.

Each method returns a new string. Chaining works left to right: the next method receives the previous result. A lowercase replacement is case-sensitive, so lower before removing a lowercase draft marker. Internal spaces in a project name are not noise unless your policy says they are.

# Preserve the raw text; clean a separate value.
raw_name = "  NIGHT SHIFT draft.MOV  "
clean_name = raw_name.strip().lower().replace(" draft", "")

# Compare the new text with the unchanged original.
print(clean_name)
print(raw_name == clean_name)

The output is night shift.mov, then False. raw_name still contains its original spaces and capitals. This is a training normalization policy, not permission to rename real files.

Read the chain, change the requested replacement, fill the scaffold, then clean a different raw name yourself. Test a name with no draft marker too.

Predict, explain, then test

These three brief checks are self-reviewed, not a scored quiz. Explain your answer before opening the comparison. Coding checks test the stated data contract on unfamiliar inputs.

Predict the chain

What happens to " Canal Draft.MOV " after strip(), lower(), then replace(" draft", "")?

Compare your answer · self-reviewed

canal.mov. Lowercasing first lets the lowercase marker match. Internal spaces unrelated to the marker remain.

Explain the original

After clean = raw.strip(), has raw itself lost its spaces?

Compare your answer · self-reviewed

No. Strings are immutable and strip returns a new string. Assigning to clean preserves raw; assigning back to raw changes what that variable refers to.

Repair the policy

Would replace(" ", "") preserve a multi-word project name?

Compare your answer · self-reviewed

No. It removes internal spaces too. strip removes only the edges; use it when the policy preserves spaces inside a name.

Now

Choose an exercise to load its prompt.

day-11.py standard Python · runs in this browser
Output

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