https://www.python.org/

Simple server

Serve current folder as webserver

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$ python -m SimpleHTTPServer 8080
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Conditional operator

Normally in C) we write:

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int total += (foo == bar) ? foo : 0;

In python is look like:

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total += foo if foo == bar else 0
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Detect Operating System

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import platform

print platform.system()
"""
The output will be 'Linux', 'Windows', or 'Java'
"""
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Define your own module

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#!/usr/bin/python
# Filename: foobar.py

def foo():
print "Hi, this is Foo"

def bar():
print "Hey, I'm Bar"

How to use?

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#!/usr/bin/python
from foobar import foo, bar

foo()
bar()

Output will be

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Hi, this is Foo
Hey, I'm Bar

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dump object

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import pprint

pprint.pprint(obj);
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Parsing text with regex

This is equivalent to PHP: preg_match_all

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import re

pattern = '(https?://\S+)'
urls = re.findall(pattern, text)
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Store chinese character in string

I had getting such an error:

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SyntaxError: Non-ASCII character '\xe5' in file filename.py on line 13, but no encoding declared; see http://www.python.org/peps/pep-0263.html for details

Fortunately, I found a solution

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# -*- coding: utf-8 -*-

Just have to add this line to the top of filename.py

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match all chinese character

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import re

regex = re.compile(ur'([\u4e00-\ufaff]+)', re.UNICODE)
text = u'this is 中文 char'
matches = regex.findall(text)

print(matches[0])

output:

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中文

NOTE: must indicate u in front of the string

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read content from web

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import urllib

url = 'http://yoururl.com/'
content = urllib.urlopen(url).read()
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Loop through month

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def month_year_iter(start_month, start_year, end_month, end_year):
ym_start= 12 * start_year + start_month - 1
ym_end= 12 * end_year + end_month - 1
for ym in range(ym_start, ym_end):
y, m = divmod(ym, 12)
yield y, m + 1
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datetime minus month

6 months ago

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today = datetime.date.today()
until_date = today - relativedelta(months=6)
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Fabric

Store the bash command output in variable

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from fabric.api import local

def foo(name):
result = local('cat file%s' % name, capture=True)
...

The output of the file will be stored in result variable.

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