I gave a talk at our @pythonph meetup. Here is a summary.

Six great things about Python 3.md

Six great things about Python 3

by github.com/MrValdez

• What are f-strings? A Python 3.6 superpower
• Python 3 installation that is helpful for complete beginners.
  • pip (3.4), virtualenv, and path installation
• More helpful chained exceptions
• The Windows py launcher
• Ordered dictionary (3.6+)
  • CPython implementation (3.6)
  • Language implementation (3.7)
  • https://stackoverflow.com/q/39980323/1599
• Keyword only arguments (3.0+) and Positional only arguments (3.8+)

---

What are f-strings? A Python 3.6 superpower

hero = "Kardo Dalisay"
food = ["Pizza", "Chicken", "Rice"]
secret = 42

# < Python 3.6
#template ="{} is so cool. They like {}. Their password is {}."
#output = template.format(hero, food, secret)

# With the f-string superpower
output = f"{hero} is so cool. They like {food}. Their password is {secret}."""

print(output)

# Another example, showing function calling, indexing, and integer grouping.
#secret = 42 * 55 * 1000
#output = f"""{hero.upper()} is so cool. 
#They like {food[0]}. 
#Their password is {secret:,}."""


# Another example showing that join works in f-strings
#output = f"""{hero.upper()} is so cool. 
#They like {", ".join(food[:-1])} and {food[-1]}. 
#Their password is {secret:,}."""

#print(output)

---

More helpful chained exceptions

def make_spam():
    def make_more_spam():
        raise TypeError

    try:
        make_more_spam()
    except TypeError:
        raise IndexError

make_spam()

Without running, what do you think is the raised exception? TypeError? or IndexError?

Answer: If you're in Python 3, the answer is all of the above.

---

The Windows py launcher

$ py

$ py --2.7

$ py --3.7

---

Keyword only arguments (3.0+) and Positional only arguments (3.8+)

def unlock(username, password, /, *, secret):
    if secret:
        password = len(password) * "*"
    
    print(f"Your username is {username}. Your password is {password}")
   

#unlock("admin", "12345", True)
#unlock("admin", "12345", secret=True)
#unlock(username="admin", password="12345", secret=True)
unlock("admin", password="12345", secret=True)

---

Bonus: Print as a function

>>> print("Hello")
Hello

>>> print(type(print))
<class 'builtin_function_or_method'>

>>> def save_to_disk(line):
...  with open("foobar.txt", "w") as f:
...   f.write(line)

>>> print = save_to_disk
>>> print("Hello world")

---

Bonus: Unicode in Python

print("♠♥♦♣")

なに = "WHAT??"
print(なに)

Reminder: with great power, comes great responsibility. Unicode variables is a great power.

not a good idea to have unicode variables.

not a good idea to have unicode variables.

You're right on that. Although, I only included unicode variable as something that can be done if really needed.

When I gave this talk, I presented the unicode variables in a tongue-in-cheek way. I was hoping the italics convey that on text. I guess it failed. I'll think of a different way to phase these kind of jokes in text better. Sorry for the confusion.

I am referring to python3 for adding unicode variable support. Already, I see lot of undocumented code and now we might have to deal with people of non-englishing trying to write code in their own language making another level of confusion.