condition_is_true if condition else condition_is_false

if condition:
	pass

if condition:
	pass
elif condition:

if condition:
	pass
else:
	pass

def numbers_to_strings(argument):
    switcher = {
        0: "zero",
        1: "one",
        2: "two",
    }
    return switcher.get(argument, "nothing")

str = "Line1-abcdef \nLine2-abc \nLine4-abcd";
print str.split( );
print str.split(' ', 1 );

import re

phone = "123-456-7890"
search = re.search(r'(\d{3})-(\d{3})-(\d{4})', phone)
if search is not None:
    pass
search.group(1)..


# re
re.compile(pattern, flags=0) 
re.search(pattern, string, flags=0)
re.match(pattern, string, flags=0)
re.split(pattern, string, maxsplit=0, flags=0)
re.sub(pattern, repl, string, count=0, flags=0)

# match
match.group([group1, ...])

pattern = re.compile(r'(\w*) (\w*)(?P<tt>.*)')
match = pattern.match('hello world!!!')
print(match.group(0))
# >> !!!
print(match.group(3))
#同上 >> !!!
print(match.group('tt'))

f = filter(fn, array)

m = map(fn, array)

d = reduce(fn, array)

f = lambda arg1, arg2, ....: expression

class Some:
    def __init__(self, x):
        self.x = x

    @classmethod
    def service(clz, y):
        print('do service...', clz, y)

Some.service(30)

import datetime
import time

# datetime
now = datetime.datetime.now()
now = datetime.datetime.utcnow()

# timestamp
time.time()

# time tuple
time.localtime()

# date
now.date()

now = datetime.datetime.utcnow()

# 從國家取得時區
pytz.country_timezones(‘cn’)

# 取得時區時間
tz = pytz.timezone('Asia/Tokyo')
datetime.datetime.now(tz)

datetime.datetime.now() - datetime.timedelta(days=3)

# 時間差
(datetime.datetime(2015,1,13,12,0,0) - datetime.datetime.now()).total_seconds()

from urllib.parse import urlparse
o = urlparse('http://www.cwi.nl:80/%7Eguido/Python.html')

o.scheme
o.geturl()

import random

random.randint(0,99)            # 隨機整數
random.randrange(0, 101, 2)     # 隨機選取0到100間的偶數
random.choice('abcdefg&#%^*f')  # 隨機字元
random.sample(range(20), 20)
random.sample('abcdefghij',3)   # 多個字元中選取特定數量的字元
random.shuffle([1, 2, 3, 4, 5, 6])  # 洗牌