← Back Peter the Python

Lesson 0: Say Hello

Why?

First words! Use print() to make Peter say something.

What to type

Type print("Hello, Python!") and press Run.

⭐ Stars: 0 🐞 Bugs: 0

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      Hint
      
Parentheses are like hands that hold your words: ( ).

    

  





from js import document, localStorage, window
import sys, io
START = '''# Make Peter speak!
print("Hello, Python!")  # change the message if you want
'''
SOLN = '''print("Hello, Python!")'''

def gi(k):
    v = localStorage.getItem(k)
    try: return int(v) if v is not None else 0
    except: return 0

def setb(stars=None, bugs=None):
    if stars is not None: localStorage.setItem('stars', str(stars))
    if bugs  is not None: localStorage.setItem('bugs',  str(bugs))
    document.getElementById('stars').textContent = f'⭐ Stars: {gi("stars")}'
    document.getElementById('bugs').textContent  = f'🐞 Bugs: {gi("bugs")}'

def run(evt):
    src = document.getElementById('editor').value
    out_el = document.getElementById('out')
    f = io.StringIO()
    try:
        old = sys.stdout; sys.stdout = f
        try: exec(src, {})
        finally: sys.stdout = old
        output = f.getvalue()
        out_el.textContent = "Your output:\n" + output + "\nExpected:\nHello, Python!\n\nAll checks passed! ⭐"
        setb(stars=gi('stars')+1)
        try: window.confetti()
        except: pass
    except Exception as e:
        out_el.textContent = "Bug found: " + str(e)
        setb(bugs=gi('bugs')+1)

document.getElementById('run').addEventListener('click', run)
document.getElementById('fill-start').addEventListener('click',
    lambda e: setattr(document.getElementById('editor'), 'value', START))
document.getElementById('fill-solution').addEventListener('click',
    lambda e: setattr(document.getElementById('editor'), 'value', SOLN))
if not document.getElementById('editor').value:
    document.getElementById('editor').value = START
setb()