![Why .py? Explicit is better than implicit.
Beautiful is better than ugly.
Flat is better than nested.
Readability counts.
class Mediator(object):
def __init__(self):
self.signals = {}
def signal(self, signal_name, *args, **kwargs):
for handler in self.signals.get(signal_name, []):
handler(*args, **kwargs)
def connect(self, signal_name, receiver):
handlers = self.signals.setdefault(signal_name, [])
handlers.append(receiver)
def disconnect(self, signal_name, receiver):
self.signals[signal_name].remove(receiver)
The Zen of Python](https://image.slidesharecdn.com/python-120507153025-phpapp02/85/Python-12-320.jpg)
![Why .py?
Good old spaghetti async style
init: function(msg, obj) {
chrome.pageAction.show(tabId);
me.api.authorize(function() {
me.api.checkDoc(msg.doc,
function(data) {
obj.get(msg);
me.api.realtime.getUpdates({
tabId: tabId,
ids: [msg.doc.id],
callbackOk: function(data) {
if (data.event == 'connected') {
obj.get(msg);
}
port.postMessage({_action: 'update', data: data});
},
callbackError: function(data) {
obj.get(msg);
}
});
},
function(data) {
console.warn('Bad document', data.responseText);
}
);
});
},](https://image.slidesharecdn.com/python-120507153025-phpapp02/85/Python-14-320.jpg)
![Why .py?
And how we see the same things
@tornado.web.asynchronous
@gen.engine
def get(self, user_id=None):
if user_id is not None:
user = yield gen.Task(User.get, user_id)
self.set_secure_cookie('uid', unicode(user._id))
response = user.as_dict()
else:
count = yield gen.Task(User.objects.count)
if not count:
yield gen.Task(User.create({'nickname': "John Doe"}).save)
users = yield gen.Task(User.objects.find, None)
response = [u.as_dict() for u in users]
self.write(json_encode(response))
self.finish()](https://image.slidesharecdn.com/python-120507153025-phpapp02/85/Python-15-320.jpg)
![Why .py? Need functional?
stripped_list = [line.strip() for line in line_list
List comprehensions if line != ""]
Generators def generate_ints(N):
for i in range(N):
yield i
val = (yield i)
Built-ins map(upper, ['sentence', 'fragment'])
[upper(s) for s in ['sentence', 'fragment']]
filter(is_even, range(10))
[x for x in range(10) if is_even(x)]
total = reduce(lambda a, b: (0, a[1] + b[1]), items)[1]](https://image.slidesharecdn.com/python-120507153025-phpapp02/85/Python-16-320.jpg)
![Why .py? Decorators
from functools import wraps
def my_decorator(func):
@wraps(func)
def wrapper(*args, **kwargs):
# we can do smth with arguments
print “args:”, args
response = func(*args, **kwargs)
# end with the method result too
return wrapper
@my_decorator
def func1(arg1):
return "inside func1()", arg1
>>>print func1(‘test’)
“args: [‘test’]”
“inside func1() test”](https://image.slidesharecdn.com/python-120507153025-phpapp02/85/Python-17-320.jpg)
![Why .py? Explicit is better than implicit.
Beautiful is better than ugly.
Flat is better than nested.
Readability counts.
class Mediator(object):
def __init__(self):
self.signals = {}
def signal(self, signal_name, *args, **kwargs):
for handler in self.signals.get(signal_name, []):
handler(*args, **kwargs)
def connect(self, signal_name, receiver):
handlers = self.signals.setdefault(signal_name, [])
handlers.append(receiver)
def disconnect(self, signal_name, receiver):
self.signals[signal_name].remove(receiver)
The Zen of Python](/p?url=https%3A%2F%2Fimage.slidesharecdn.com%2Fpython-120507153025-phpapp02%2F85%2FPython-12-320.jpg&__src=https%3A%2F%2Fwww.slideshare.net%2Fslideshow%2Fpython-12836486%2F12836486&__type=image)
![Why .py?
Good old spaghetti async style
init: function(msg, obj) {
chrome.pageAction.show(tabId);
me.api.authorize(function() {
me.api.checkDoc(msg.doc,
function(data) {
obj.get(msg);
me.api.realtime.getUpdates({
tabId: tabId,
ids: [msg.doc.id],
callbackOk: function(data) {
if (data.event == 'connected') {
obj.get(msg);
}
port.postMessage({_action: 'update', data: data});
},
callbackError: function(data) {
obj.get(msg);
}
});
},
function(data) {
console.warn('Bad document', data.responseText);
}
);
});
},](/p?url=https%3A%2F%2Fimage.slidesharecdn.com%2Fpython-120507153025-phpapp02%2F85%2FPython-14-320.jpg&__src=https%3A%2F%2Fwww.slideshare.net%2Fslideshow%2Fpython-12836486%2F12836486&__type=image)
![Why .py?
And how we see the same things
@tornado.web.asynchronous
@gen.engine
def get(self, user_id=None):
if user_id is not None:
user = yield gen.Task(User.get, user_id)
self.set_secure_cookie('uid', unicode(user._id))
response = user.as_dict()
else:
count = yield gen.Task(User.objects.count)
if not count:
yield gen.Task(User.create({'nickname': "John Doe"}).save)
users = yield gen.Task(User.objects.find, None)
response = [u.as_dict() for u in users]
self.write(json_encode(response))
self.finish()](/p?url=https%3A%2F%2Fimage.slidesharecdn.com%2Fpython-120507153025-phpapp02%2F85%2FPython-15-320.jpg&__src=https%3A%2F%2Fwww.slideshare.net%2Fslideshow%2Fpython-12836486%2F12836486&__type=image)
![Why .py? Need functional?
stripped_list = [line.strip() for line in line_list
List comprehensions if line != ""]
Generators def generate_ints(N):
for i in range(N):
yield i
val = (yield i)
Built-ins map(upper, ['sentence', 'fragment'])
[upper(s) for s in ['sentence', 'fragment']]
filter(is_even, range(10))
[x for x in range(10) if is_even(x)]
total = reduce(lambda a, b: (0, a[1] + b[1]), items)[1]](/p?url=https%3A%2F%2Fimage.slidesharecdn.com%2Fpython-120507153025-phpapp02%2F85%2FPython-16-320.jpg&__src=https%3A%2F%2Fwww.slideshare.net%2Fslideshow%2Fpython-12836486%2F12836486&__type=image)
![Why .py? Decorators
from functools import wraps
def my_decorator(func):
@wraps(func)
def wrapper(*args, **kwargs):
# we can do smth with arguments
print “args:”, args
response = func(*args, **kwargs)
# end with the method result too
return wrapper
@my_decorator
def func1(arg1):
return "inside func1()", arg1
>>>print func1(‘test’)
“args: [‘test’]”
“inside func1() test”](/p?url=https%3A%2F%2Fimage.slidesharecdn.com%2Fpython-120507153025-phpapp02%2F85%2FPython-17-320.jpg&__src=https%3A%2F%2Fwww.slideshare.net%2Fslideshow%2Fpython-12836486%2F12836486&__type=image)
Uploaded byYehor Nazarkin
обзор Python
This document discusses using Python for web development. Some key points: - Python is a flexible, open source language that is well-suited for web projects due to its extensive standard library, third-party modules, and large developer community. - Python code tends to be more readable and maintainable than other languages like Java or PHP due to Python's simplicity, readability-focused syntax, and support for functional programming patterns. - Python web frameworks provide batteries included functionality like template engines, object relational mappers, caching, and asynchronous request handling that speed up development. - Python's extensive standard library and ecosystem of third-party modules provide solutions for common tasks like localization, testing, debugging
