Repository navigation
Expand file tree
/
Copy pathpython-2-or-3.html
More file actions
228 lines (227 loc) · 19.6 KB
/
Copy pathpython-2-or-3.html
File metadata and controls
228 lines (227 loc) · 19.6 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="author" content="Matt Makai">
<meta name="description" content="Learn about whether you should use Python version 2 or 3 to build your applications.">
<link rel="shortcut icon" href="theme/img/fsp-fav.png">
<title>Python 2 or 3? - Full Stack Python</title>
<!--[if lt IE 9]>
<script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
<script src="https://oss.maxcdn.com/libs/respond.js/1.3.0/respond.min.js"></script>
<![endif]-->
<link href="theme/css/f.min.css" rel="stylesheet">
</head>
<body>
<div style="padding: 0 0 20px 0; margin: 0 0 20px 0; background-color: #22B24C;">
<div class="container">
<h2 style="color: #fff; margin: 20px 40px 0 0;"><a href="https://www.gumroad.com/l/python-deployments" style="color: #fff">The Full Stack Python Guide to Deployments book</a> has been released!</h2>
</div>
</div> <a href="https://github.com/makaimc/fullstackpython.com"><img style="position: absolute; top: 0; right: 0; border: 0;" src="/theme/img/fork.png" alt="Fork me on GitHub"></a>
<div class="container">
<div class="row">
<div class="col-md-12">
<div class="logo-header-section">
<a href="/" style="text-decoration: none; border: none;"><img src="theme/img/fsp-logo.png" height="52" width="52" class="logo-image" style="padding-top: 1px;" alt="Full Stack Python logo"></a>
<span class="logo-title"><a href="/">Full Stack Python</a></span>
</div>
</div>
</div><div class="row">
<div class="col-md-8">
<h1>Python 2 or 3?</h1>
<p>The Python programming language is currently in the midst of a long-term
transition from version 2 to version 3. New programmers typically have many
questions about which version they should learn. It's confusing to hear
that Python 3, which was originally released in 2008, is still not the default
installation on many operating systems.</p>
<p>Here's the good news: you can't go wrong starting with either version. While
there are differences in unicode and syntax, for the most part if you
start with Python 2 and then learn Python 3 you won't be starting from
scratch. Likewise, you'll be able to read and write Python 2 code if you
started with Python 3.</p>
<p>My personal recommendation for new programmers as of right now is to start
with Python 3. There are enough <a href="/best-python-resources.html">great resources</a>
out there that teach version 3 from the ground up.</p>
<p>However, if you are interested in DevOps-type work with
<a href="/configuration-management.html">configuration management tools</a> such as
Ansible or Fabric, then you'll have to stick to Python 2 because they have
yet to upgrade to support Python 3. If you know there are libraries you must
use in a project, check the
<a href="https://python3wos.appspot.com/">Python Walls of Superpowers</a>. If you're
using Django, there is also a wall specifically for
<a href="http://djangowos.com/">Python 3 compatibility of popular Django packages</a>.</p>
<h3>Python 2 to 3 resources</h3>
<ul>
<li>
<p>The official
<a href="https://wiki.python.org/moin/PortingToPy3k/">porting code to Python 3</a>
page links to resources on porting Python code as well as underlying C
implementations. There is also a
<a href="https://wiki.python.org/moin/PortingToPy3k/BilingualQuickRef">quick reference for writting code with Python 2 and 3 compatibility</a>.</p>
</li>
<li>
<p><a href="http://nothingbutsnark.svbtle.com/porting-to-python-3-is-like-eating-your-vegetables">Porting to Python 3 is like eating your vegetables</a>
explains that there are treats in Python 3 that are worth porting for and
has some tips on making the transition easier.</p>
</li>
<li>
<p><a href="http://ptgmedia.pearsoncmg.com/imprint_downloads/informit/promotions/python/python2python3.pdf">Moving from Python 2 to Python 3</a>
is a PDF cheatsheet for porting your Python code.</p>
</li>
<li>
<p><a href="https://godjango.com/96-django-and-python-3-how-to-setup-pyenv-for-multiple-pythons/">Django and Python 3 How to Setup pyenv for Multiple Pythons</a>
is a screencast showing how to run both Python 2 and 3 for different
projects using pyenv.</p>
</li>
<li>
<p><a href="http://blog.scrapinghub.com/2015/08/19/scrapy-on-the-road-to-python-3-support/">Scrapy on the road to Python 3 support</a>
explains from the perspective of a widely used Python project what their
plan is for supporting Python 3 and why it has taken so long to make it
happen.</p>
</li>
</ul>
<h3>What's next now that you know about Python versions?</h3>
<div class="row">
<div class="col-md-4">
<div class="well select-next">
<a href="/development-environments.html" class="btn btn-success btn-full"><svg width="34" height="30" viewBox="0 0 1792 1792" xmlns="http://www.w3.org/2000/svg"><path d="M1728 992v-832q0-13-9.5-22.5t-22.5-9.5h-1600q-13 0-22.5 9.5t-9.5 22.5v832q0 13 9.5 22.5t22.5 9.5h1600q13 0 22.5-9.5t9.5-22.5zm128-832v1088q0 66-47 113t-113 47h-544q0 37 16 77.5t32 71 16 43.5q0 26-19 45t-45 19h-512q-26 0-45-19t-19-45q0-14 16-44t32-70 16-78h-544q-66 0-113-47t-47-113v-1088q0-66 47-113t113-47h1600q66 0 113 47t47 113z" fill="#fff"/></svg></a>
<p class="under-btn">What editor should I use to code my Python app?</p> </div>
</div>
<div class="col-md-4">
<div class="well select-next">
<a href="/web-frameworks.html" class="btn btn-success btn-full"><svg width="28" height="30" viewBox="0 0 1792 1792" xmlns="http://www.w3.org/2000/svg"><path d="M553 1399l-50 50q-10 10-23 10t-23-10l-466-466q-10-10-10-23t10-23l466-466q10-10 23-10t23 10l50 50q10 10 10 23t-10 23l-393 393 393 393q10 10 10 23t-10 23zm591-1067l-373 1291q-4 13-15.5 19.5t-23.5 2.5l-62-17q-13-4-19.5-15.5t-2.5-24.5l373-1291q4-13 15.5-19.5t23.5-2.5l62 17q13 4 19.5 15.5t2.5 24.5zm657 651l-466 466q-10 10-23 10t-23-10l-50-50q-10-10-10-23t10-23l393-393-393-393q-10-10-10-23t10-23l50-50q10-10 23-10t23 10l466 466q10 10 10 23t-10 23z" fill="#fff"/></svg></a>
<p class="under-btn">I want to learn how to code a Python web application using a framework.</p> </div>
</div>
<div class="col-md-4">
<div class="well select-next">
<a href="/best-python-resources.html" class="btn btn-success btn-full"><svg width="28" height="30" viewBox="0 0 1792 1792" xmlns="http://www.w3.org/2000/svg"><path d="M1703 478q40 57 18 129l-275 906q-19 64-76.5 107.5t-122.5 43.5h-923q-77 0-148.5-53.5t-99.5-131.5q-24-67-2-127 0-4 3-27t4-37q1-8-3-21.5t-3-19.5q2-11 8-21t16.5-23.5 16.5-23.5q23-38 45-91.5t30-91.5q3-10 .5-30t-.5-28q3-11 17-28t17-23q21-36 42-92t25-90q1-9-2.5-32t.5-28q4-13 22-30.5t22-22.5q19-26 42.5-84.5t27.5-96.5q1-8-3-25.5t-2-26.5q2-8 9-18t18-23 17-21q8-12 16.5-30.5t15-35 16-36 19.5-32 26.5-23.5 36-11.5 47.5 5.5l-1 3q38-9 51-9h761q74 0 114 56t18 130l-274 906q-36 119-71.5 153.5t-128.5 34.5h-869q-27 0-38 15-11 16-1 43 24 70 144 70h923q29 0 56-15.5t35-41.5l300-987q7-22 5-57 38 15 59 43zm-1064 2q-4 13 2 22.5t20 9.5h608q13 0 25.5-9.5t16.5-22.5l21-64q4-13-2-22.5t-20-9.5h-608q-13 0-25.5 9.5t-16.5 22.5zm-83 256q-4 13 2 22.5t20 9.5h608q13 0 25.5-9.5t16.5-22.5l21-64q4-13-2-22.5t-20-9.5h-608q-13 0-25.5 9.5t-16.5 22.5z" fill="#fff"/></svg></a>
<p class="under-btn">Show me a list of the best Python learning resources.</p> </div>
</div>
</div><div id="mc_embed_signup">
<form action="//mattmakai.us2.list-manage.com/subscribe/post?u=b7e774f0c4f05dcebbfee183d&id=b22335388d" method="post" id="mc-embedded-subscribe-form" name="mc-embedded-subscribe-form" class="validate" target="_blank" novalidate>
<div id="mc_embed_signup_scroll">
<h4>Sign up here to receive an email with major updates to this site and Python tutorials delivered to your inbox once a month.</h4>
<div class="row">
<div class="col-md-9">
<input type="email" value="" name="EMAIL" class="email form-control" id="mce-EMAIL" placeholder="email address" required>
<div style="position: absolute; left: -5000px;"><input type="text" name="b_b7e774f0c4f05dcebbfee183d_b22335388d" tabindex="-1" value=""></div>
</div>
<div class="col-md-3">
<div class="clear"><input type="submit" value="Subscribe" name="subscribe" id="mc-embedded-subscribe" class="btn btn-success" style="font-family: 'Helvetica Neue';"></div>
</div>
</div>
</div>
</form>
</div>
</div>
<div class="col-md-offset-1 col-md-3" id="sidebar">
<div class="panel panel-success">
<div class="panel-body">
<a href="http://www.deploypython.com/"><img src="https://static.fullstackpython.com/fsp-deployment-guide.png" alt="The Full Stack Python Guide to Deployments" width="100%"></a>
<p style="font-size: .8em; margin-top: 10px;">Searching for a complete, step-by-step deployment walkthrough? Learn more about <a href="http://www.deploypython.com/">The Full Stack Python Guide to Deployments book</a>.
</p>
</div>
</div> <div class="panel panel-success">
<div class="panel-heading">
<h3 class="panel-head"><a href="/table-of-contents.html" style="color: #fff;">Table of Contents</a></h3>
</div>
<div class="list-group">
<a href="/introduction.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Introduction</a>
<a href="/learning-programming.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Learning Programming</a>
<a href="/why-use-python.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Why Use Python?</a>
<a href="/python-2-or-3.html" class="list-group-item smaller-item active" style='font-family: "Helvetica Neue",sans-serif;'>Python 2 or 3?</a>
<a href="/enterprise-python.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Enterprise Python</a>
<a href="/best-python-resources.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Best Python Resources</a>
<a href="/best-python-videos.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Best Python Videos</a>
<a href="/development-environments.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Development Environments</a>
<a href="/vim.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Vim</a>
<a href="/emacs.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Emacs</a>
<a href="/generators.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Generators</a>
<a href="/comprehensions.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Comprehensions</a>
<a href="/web-frameworks.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Web Frameworks</a>
<a href="/django.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Django</a>
<a href="/flask.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Flask</a>
<a href="/bottle.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Bottle</a>
<a href="/pyramid.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Pyramid</a>
<a href="/morepath.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Morepath</a>
<a href="/other-web-frameworks.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Other Web Frameworks</a>
<a href="/web-design.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Web Design</a>
<a href="/cascading-style-sheets.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Cascading Style Sheets</a>
<a href="/javascript.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>JavaScript</a>
<a href="/websockets.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>WebSockets</a>
<a href="/web-application-security.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Web Application Security</a>
<a href="/static-site-generator.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Static Site Generator</a>
<a href="/data.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Data</a>
<a href="/databases.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Databases</a>
<a href="/no-sql-datastore.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>NoSQL Data Stores</a>
<a href="/object-relational-mappers-orms.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Object-relational Mappers (ORMs)</a>
<a href="/application-programming-interfaces.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Application Programming Interfaces</a>
<a href="/api-integration.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>API Integration</a>
<a href="/api-creation.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>API Creation</a>
<a href="/deployment.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Deployment</a>
<a href="/servers.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Servers</a>
<a href="/platform-as-a-service.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Platform-as-a-service</a>
<a href="/operating-systems.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Operating Systems</a>
<a href="/web-servers.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Web Servers</a>
<a href="/wsgi-servers.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>WSGI Servers</a>
<a href="/source-control.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Source Control</a>
<a href="/application-dependencies.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Application Dependencies</a>
<a href="/static-content.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Static Content</a>
<a href="/task-queues.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Task Queues</a>
<a href="/configuration-management.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Configuration Management</a>
<a href="/continuous-integration.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Continuous Integration</a>
<a href="/logging.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Logging</a>
<a href="/monitoring.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Monitoring</a>
<a href="/web-analytics.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Web Analytics</a>
<a href="/docker.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Docker</a>
<a href="/caching.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Caching</a>
<a href="/testing.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Testing</a>
<a href="/unit-testing.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Unit Testing</a>
<a href="/integration-testing.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Integration Testing</a>
<a href="/code-metrics.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Code Metrics</a>
<a href="/debugging.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Debugging</a>
<a href="/what-full-stack-means.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>What "Full Stack" Means</a>
<a href="/change-log.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Change Log</a>
<a href="/future-directions.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Future Directions</a>
<a href="/about-author.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>About the Author</a>
</div>
</div>
<div class="panel panel-success">
<div class="panel-body">
<a href="http://www.deploypython.com/"><img src="https://static.fullstackpython.com/fsp-deployment-guide.png" alt="The Full Stack Python Guide to Deployments" width="100%"></a>
<p style="font-size: .8em; margin-top: 10px;">Searching for a complete, step-by-step deployment walkthrough? Learn more about <a href="http://www.deploypython.com/">The Full Stack Python Guide to Deployments book</a>.
</p>
</div>
</div> <div class="panel panel-success">
<div class="panel-heading"><h3 class="panel-head">Python 2 or 3?</h3></div>
<div class="panel-body">
Major updates are tweeted via
<a href="https://twitter.com/fullstackpython">@fullstackpython</a>.
<hr/>
Need more detailed tutorials than you see here?
<a href="http://www.deploypython.com/">Learn more about The Full Stack Python Guide to Deployments book.</a>
</div>
</div>
</div></div>
<hr/>
<div class="footer pull-right">
<a href="http://www.mattmakai.com/" class="underline">Matt Makai</a>
2015
</div>
</div>
<script>
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
ga('create', 'UA-19910497-7', 'auto');
ga('send', 'pageview');
</script>
<script type='text/javascript'>
var trackOutboundLink = function(url) { ga('send', 'event', 'outbound', 'click', url, {'hitCallback': function () { document.location = url; } }); }
</script>
</body>
</html>