The document discusses the author's affection for Python, highlighting its features like dynamic typing, native types, and first-class functions. It includes code snippets demonstrating Python's capabilities, such as error handling, string manipulation, and file operations. Additionally, it mentions the simplicity and versatility of using Python in various applications.

1. Why I love Python!
By Johannes Lundberg
@johannesl
Founder & CEO of 46elks

2. The Interpreter
>>> 1+1
2
>>>
>>> s = 'hello'
>>> s.uppercase()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'str' object has no attribute
'uppercase'

3. Dynamic typing
i = 1234
hostname = '127.0.0.1'

4. python -i
python -i hello.py
>>> print i
1234

5. Great native types
i = 1234
name = 'Johannes Lundberg'
startups = [ 'Kundo', '46elks' ]
options = {
'port': 12345,
'logpath': '../debug.log'
}

6. Native types are objects
>>> startups.sort()
>>> startups
['46elks', 'Kundo']
s = 'Rxc3xa4kenskapsxc3xa5r'
print s.decode('utf-8')
Räkenskapsår
options.has_key('logpath')
name.split(' ')[-1]
(123).bit_length

7. dir()
>>> dir(’Pycon Sweden 2015’)
['capitalize', 'center', 'count', 'decode',
'encode', 'endswith', 'expandtabs', 'find',
'format', 'index', 'isalnum', 'isalpha',
'isdigit', 'islower', 'isspace', 'istitle',
'isupper', 'join', 'ljust', 'lower',
'lstrip', 'partition', 'replace', 'rfind',
'rindex', 'rjust', 'rpartition', 'rsplit',
'rstrip', 'split', 'splitlines',
'startswith', 'strip', 'swapcase', 'title',
'translate', 'upper', 'zfill']

8. Functions as first-class citizens
def writelog(s):
pass
if options.has_key('logpath'):
f = open(options['logpath'],'wb')
writelog = f.write

9. OOP is not mandatory
players = []
for line in open('players.txt'):
if not line.startswith('#'):
players.append( line.strip() )

10. Awesome standard libraries
import hashlib
import ftp
import urllib
s=urllib.urlopen('http://ph4.se/').read()
hashlib.sha256(s).hexdigest()
…

11. Works everywhere
scp hello.py ph4labs.com:.