message = "Hello Python world!"
print(message)

Hello Python world!

# 2.1
message = "xixixi"
print(message)

xixixi

# 2.2
m2 = "lalala"
print(m2)
m2 = "hahaha"
print(m2)

lalala
hahaha

name = "ada lovelace"
print(name.title())
print(name.upper())
print(name.lower())

Ada Lovelace
ADA LOVELACE
ada lovelace

first_name = "ada"
last_name = "lovelace"
full_name = f"{first_name} {last_name}"
print(full_name)
print(f"Hello, {full_name.title()}!")

ada lovelace
Hello, Ada Lovelace!

favorite_language = '  python  '
print(favorite_language.rstrip())
print(favorite_language.lstrip())
print(favorite_language.strip())

  python
python  
python

nostarch_url = 'https://nostarch.com'
simple_url = nostarch_url.removeprefix('https://')
print(nostarch_url)
print(simple_url)

https://nostarch.com
nostarch.com

# 2.3
name = "eric"
message = f"Hello {name.title()}, would you like to learn some Python today?"
print(message)

Hello Eric, would you like to learn some Python today?

# 2.4
name = "justin bieber"
print(name.lower())
print(name.upper())
print(name.title())

justin bieber
JUSTIN BIEBER
Justin Bieber

# 2.5
name = "albert einstein"
talk = "A person who never made a mistake never tried anything new."
full = f'{name.title()} once said, "{talk}"'
print(full)

Albert Einstein once said, "A person who never made a mistake never tried anything new."

# 2.6
famous_person = "albert einstein"
message = f'{famous_person.title()} once said, "A person who never made a mistake never tried anything new."'
print(message)

Albert Einstein once said, "A person who never made a mistake never tried anything new."

# 2.7
name = "\t\t  selena gomez  \n\t"
print('1.--' + name + '--')
print('2.--' + name.lstrip() + '--')
print('3.--' + name.rstrip() + '--')
print('4.--' + name.strip().title() + '--')

1.--		  selena gomez  
	--
2.--selena gomez  
	--
3.--		  selena gomez--
4.--Selena Gomez--

# 2.8
filename = 'python_notes.txt'
print(filename)
print(filename.removesuffix('.txt'))

python_notes.txt
python_notes

# 2.9
print(5+3)
print(9-1)
print(2*4)
print(16//2)

8
8
8
8

# 2.10
number = 36
print('the number is ' + str(number))

the number is 36

# 2.11
# 啦啦啦
print('lalala')

lalala

import this

The Zen of Python, by Tim Peters

Beautiful is better than ugly.
Explicit is better than implicit.
Simple is better than complex.
Complex is better than complicated.
Flat is better than nested.
Sparse is better than dense.
Readability counts.
Special cases aren't special enough to break the rules.
Although practicality beats purity.
Errors should never pass silently.
Unless explicitly silenced.
In the face of ambiguity, refuse the temptation to guess.
There should be one-- and preferably only one --obvious way to do it.
Although that way may not be obvious at first unless you're Dutch.
Now is better than never.
Although never is often better than *right* now.
If the implementation is hard to explain, it's a bad idea.
If the implementation is easy to explain, it may be a good idea.
Namespaces are one honking great idea -- let's do more of those!