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Hello Jinja

How to generate HTML and other output using the Jinja templating engine.
To generate output by simple concatenation of strings is both tedious and messy. To allow for better separation between the programming logic and the presentation, it is beneficial to use an additional layer between the login of a page and its rendering. This layer is often provided by a templating engine. The following examples show a simple use of a templating engine.
Expand/Shrink
Zdroj: (jinja1-1.py)
  1   import jinja2
  2   
  3   template = jinja2.Template("""===========
  4   {% for greeting in greetings %}
  5   {{ greeting }}
  6   {% endfor %}
  7   ===========""")
  8   data = ["Hello Jinja" for i in range(10)]
  9   result = template.render( greetings=data)
 10   print result
stdout:
===========

Hello Jinja

Hello Jinja

Hello Jinja

Hello Jinja

Hello Jinja

Hello Jinja

Hello Jinja

Hello Jinja

Hello Jinja

Hello Jinja

===========
Doba běhu: 77.3 ms
The following example is more interesting - it uses a file-based template together with data loaded from a database.
Expand/Shrink
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>{{ title }}</title>
</head>
<body>
<table>
{% for country in countries %}
<tr><td>{{ country['Name'] }}</td><td>{{ country['Population'] }}</td></tr>
{% endfor %}
</table>
</body>
</html>
Zdroj: (jinja1-2.py)
  1   import MySQLdb
  2   from MySQLdb.cursors import DictCursor
  3   import jinja2
  4   
  5   connection = MySQLdb.connect( user="test", passwd="pass123", db="world", host="localhost", cursorclass=DictCursor, use_unicode=True) 
  6   cursor1 = connection.cursor()
  7   
  8   cursor1.execute( "SELECT Name,Population FROM Country ORDER BY Name;")
  9   countries = cursor1.fetchall()
 10   cursor1.close()
 11   connection.close()
 12   
 13   env = jinja2.Environment(loader=jinja2.FileSystemLoader(["./infiles"])) 
 14   template = env.get_template( "page_template1.html") 
 15   result = template.render( title="Country list", countries=countries)
 16   print result.encode('utf-8')
stdout:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Country list</title>
</head>
<body>
<table>

<tr><td>Afghanistan</td><td>22720000</td></tr>

<tr><td>Albania</td><td>3401200</td></tr>

<tr><td>Algeria</td><td>31471000</td></tr>

<tr><td>American Samoa</td><td>68000</td></tr>

<tr><td>Andorra</td><td>78000</td></tr>

<tr><td>Angola</td><td>12878000</td></tr>

<tr><td>Anguilla</td><td>8000</td></tr>

<tr><td>Antarctica</td><td>0</td></tr>

<tr><td>Antigua and Barbuda</td><td>68000</td></tr>

<tr><td>Argentina</td><td>37032000</td></tr>

<tr><td>Armenia</td><td>3520000</td></tr>

<tr><td>Aruba</td><td>103000</td></tr>

<tr><td>Australia</td><td>18886000</td></tr>

<tr><td>Austria</td><td>8091800</td></tr>

<tr><td>Azerbaijan</td><td>7734000</td></tr>

<tr><td>Bahamas</td><td>307000</td></tr>

<tr><td>Bahrain</td><td>617000</td></tr>

<tr><td>Bangladesh</td><td>129155000</td></tr>

<tr><td>Barbados</td><td>270000</td></tr>

<tr><td>Belarus</td><td>10236000</td></tr>

<tr><td>Belgium</td><td>10239000</td></tr>

<tr><td>Belize</td><td>241000</td></tr>

<tr><td>Benin</td><td>6097000</td></tr>

<tr><td>Bermuda</td><td>65000</td></tr>

<tr><td>Bhutan</td><td>2124000</td></tr>

<tr><td>Bolivia</td><td>8329000</td></tr>

<tr><td>Bosnia and Herzegovina</td><td>3972000</td></tr>

<tr><td>Botswana</td><td>1622000</td></tr>

<tr><td>Bouvet Island</td><td>0</td></tr>

<tr><td>Brazil</td><td>170115000</td></tr>

<tr><td>British Indian Ocean Territory</td><td>0</td></tr>

<tr><td>Brunei</td><td>328000</td></tr>

<tr><td>Bulgaria</td><td>8190900</td></tr>

<tr><td>Burkina Faso</td><td>11937000</td></tr>

<tr><td>Burundi</td><td>6695000</td></tr>

<tr><td>Cambodia</td><td>11168000</td></tr>

<tr><td>Cameroon</td><td>15085000</td></tr>

<tr><td>Canada</td><td>31147000</td></tr>

<tr><td>Cape Verde</td><td>428000</td></tr>

<tr><td>Cayman Islands</td><td>38000</td></tr>

<tr><td>Central African Republic</td><td>3615000</td></tr>

<tr><td>Chad</td><td>7651000</td></tr>

<tr><td>Chile</td><td>15211000</td></tr>

<tr><td>China</td><td>1277558000</td></tr>

<tr><td>Christmas Island</td><td>2500</td></tr>

<tr><td>Cocos (Keeling) Islands</td><td>600</td></tr>

<tr><td>Colombia</td><td>42321000</td></tr>

<tr><td>Comoros</td><td>578000</td></tr>

<tr><td>Congo</td><td>2943000</td></tr>

<tr><td>Congo, The Democratic Republic of the</td><td>51654000</td></tr>

<tr><td>Cook Islands</td><td>20000</td></tr>

<tr><td>Costa Rica</td><td>4023000</td></tr>

<tr><td>Côte d’Ivoire</td><td>14786000</td></tr>

<tr><td>Croatia</td><td>4473000</td></tr>

<tr><td>Cuba</td><td>11201000</td></tr>

<tr><td>Cyprus</td><td>754700</td></tr>

<tr><td>Czech Republic</td><td>10278100</td></tr>

<tr><td>Denmark</td><td>5330000</td></tr>

<tr><td>Djibouti</td><td>638000</td></tr>

<tr><td>Dominica</td><td>71000</td></tr>

<tr><td>Dominican Republic</td><td>8495000</td></tr>

<tr><td>East Timor</td><td>885000</td></tr>

<tr><td>Ecuador</td><td>12646000</td></tr>

<tr><td>Egypt</td><td>68470000</td></tr>

<tr><td>El Salvador</td><td>6276000</td></tr>

<tr><td>Equatorial Guinea</td><td>453000</td></tr>

<tr><td>Eritrea</td><td>3850000</td></tr>

<tr><td>Estonia</td><td>1439200</td></tr>

<tr><td>Ethiopia</td><td>62565000</td></tr>

<tr><td>Falkland Islands</td><td>2000</td></tr>

<tr><td>Faroe Islands</td><td>43000</td></tr>

<tr><td>Fiji Islands</td><td>817000</td></tr>

<tr><td>Finland</td><td>5171300</td></tr>

<tr><td>France</td><td>59225700</td></tr>

<tr><td>French Guiana</td><td>181000</td></tr>

<tr><td>French Polynesia</td><td>235000</td></tr>

<tr><td>French Southern territories</td><td>0</td></tr>

<tr><td>Gabon</td><td>1226000</td></tr>

<tr><td>Gambia</td><td>1305000</td></tr>

<tr><td>Georgia</td><td>4968000</td></tr>

<tr><td>Germany</td><td>82164700</td></tr>

<tr><td>Ghana</td><td>20212000</td></tr>

<tr><td>Gibraltar</td><td>25000</td></tr>

<tr><td>Greece</td><td>10545700</td></tr>

<tr><td>Greenland</td><td>56000</td></tr>

<tr><td>Grenada</td><td>94000</td></tr>

<tr><td>Guadeloupe</td><td>456000</td></tr>

<tr><td>Guam</td><td>168000</td></tr>

<tr><td>Guatemala</td><td>11385000</td></tr>

<tr><td>Guinea</td><td>7430000</td></tr>

<tr><td>Guinea-Bissau</td><td>1213000</td></tr>

<tr><td>Guyana</td><td>861000</td></tr>

<tr><td>Haiti</td><td>8222000</td></tr>

<tr><td>Heard Island and McDonald Islands</td><td>0</td></tr>

<tr><td>Holy See (Vatican City State)</td><td>1000</td></tr>

<tr><td>Honduras</td><td>6485000</td></tr>

<tr><td>Hong Kong</td><td>6782000</td></tr>

<tr><td>Hungary</td><td>10043200</td></tr>

<tr><td>Iceland</td><td>279000</td></tr>

<tr><td>India</td><td>1013662000</td></tr>

<tr><td>Indonesia</td><td>212107000</td></tr>

<tr><td>Iran</td><td>67702000</td></tr>

<tr><td>Iraq</td><td>23115000</td></tr>

<tr><td>Ireland</td><td>3775100</td></tr>

<tr><td>Israel</td><td>6217000</td></tr>

<tr><td>Italy</td><td>57680000</td></tr>

<tr><td>Jamaica</td><td>2583000</td></tr>

<tr><td>Japan</td><td>126714000</td></tr>

<tr><td>Jordan</td><td>5083000</td></tr>

<tr><td>Kazakstan</td><td>16223000</td></tr>

<tr><td>Kenya</td><td>30080000</td></tr>

<tr><td>Kiribati</td><td>83000</td></tr>

<tr><td>Kuwait</td><td>1972000</td></tr>

<tr><td>Kyrgyzstan</td><td>4699000</td></tr>

<tr><td>Laos</td><td>5433000</td></tr>

<tr><td>Latvia</td><td>2424200</td></tr>

<tr><td>Lebanon</td><td>3282000</td></tr>

<tr><td>Lesotho</td><td>2153000</td></tr>

<tr><td>Liberia</td><td>3154000</td></tr>

<tr><td>Libyan Arab Jamahiriya</td><td>5605000</td></tr>

<tr><td>Liechtenstein</td><td>32300</td></tr>

<tr><td>Lithuania</td><td>3698500</td></tr>

<tr><td>Luxembourg</td><td>435700</td></tr>

<tr><td>Macao</td><td>473000</td></tr>

<tr><td>Macedonia</td><td>2024000</td></tr>

<tr><td>Madagascar</td><td>15942000</td></tr>

<tr><td>Malawi</td><td>10925000</td></tr>

<tr><td>Malaysia</td><td>22244000</td></tr>

<tr><td>Maldives</td><td>286000</td></tr>

<tr><td>Mali</td><td>11234000</td></tr>

<tr><td>Malta</td><td>380200</td></tr>

<tr><td>Marshall Islands</td><td>64000</td></tr>

<tr><td>Martinique</td><td>395000</td></tr>

<tr><td>Mauritania</td><td>2670000</td></tr>

<tr><td>Mauritius</td><td>1158000</td></tr>

<tr><td>Mayotte</td><td>149000</td></tr>

<tr><td>Mexico</td><td>98881000</td></tr>

<tr><td>Micronesia, Federated States of</td><td>119000</td></tr>

<tr><td>Moldova</td><td>4380000</td></tr>

<tr><td>Monaco</td><td>34000</td></tr>

<tr><td>Mongolia</td><td>2662000</td></tr>

<tr><td>Montserrat</td><td>11000</td></tr>

<tr><td>Morocco</td><td>28351000</td></tr>

<tr><td>Mozambique</td><td>19680000</td></tr>

<tr><td>Myanmar</td><td>45611000</td></tr>

<tr><td>Namibia</td><td>1726000</td></tr>

<tr><td>Nauru</td><td>12000</td></tr>

<tr><td>Nepal</td><td>23930000</td></tr>

<tr><td>Netherlands</td><td>15864000</td></tr>

<tr><td>Netherlands Antilles</td><td>217000</td></tr>

<tr><td>New Caledonia</td><td>214000</td></tr>

<tr><td>New Zealand</td><td>3862000</td></tr>

<tr><td>Nicaragua</td><td>5074000</td></tr>

<tr><td>Niger</td><td>10730000</td></tr>

<tr><td>Nigeria</td><td>111506000</td></tr>

<tr><td>Niue</td><td>2000</td></tr>

<tr><td>Norfolk Island</td><td>2000</td></tr>

<tr><td>North Korea</td><td>24039000</td></tr>

<tr><td>Northern Mariana Islands</td><td>78000</td></tr>

<tr><td>Norway</td><td>4478500</td></tr>

<tr><td>Oman</td><td>2542000</td></tr>

<tr><td>Pakistan</td><td>156483000</td></tr>

<tr><td>Palau</td><td>19000</td></tr>

<tr><td>Palestine</td><td>3101000</td></tr>

<tr><td>Panama</td><td>2856000</td></tr>

<tr><td>Papua New Guinea</td><td>4807000</td></tr>

<tr><td>Paraguay</td><td>5496000</td></tr>

<tr><td>Peru</td><td>25662000</td></tr>

<tr><td>Philippines</td><td>75967000</td></tr>

<tr><td>Pitcairn</td><td>50</td></tr>

<tr><td>Poland</td><td>38653600</td></tr>

<tr><td>Portugal</td><td>9997600</td></tr>

<tr><td>Puerto Rico</td><td>3869000</td></tr>

<tr><td>Qatar</td><td>599000</td></tr>

<tr><td>Réunion</td><td>699000</td></tr>

<tr><td>Romania</td><td>22455500</td></tr>

<tr><td>Russian Federation</td><td>146934000</td></tr>

<tr><td>Rwanda</td><td>7733000</td></tr>

<tr><td>Saint Helena</td><td>6000</td></tr>

<tr><td>Saint Kitts and Nevis</td><td>38000</td></tr>

<tr><td>Saint Lucia</td><td>154000</td></tr>

<tr><td>Saint Pierre and Miquelon</td><td>7000</td></tr>

<tr><td>Saint Vincent and the Grenadines</td><td>114000</td></tr>

<tr><td>Samoa</td><td>180000</td></tr>

<tr><td>San Marino</td><td>27000</td></tr>

<tr><td>Sao Tome and Principe</td><td>147000</td></tr>

<tr><td>Saudi Arabia</td><td>21607000</td></tr>

<tr><td>Senegal</td><td>9481000</td></tr>

<tr><td>Seychelles</td><td>77000</td></tr>

<tr><td>Sierra Leone</td><td>4854000</td></tr>

<tr><td>Singapore</td><td>3567000</td></tr>

<tr><td>Slovakia</td><td>5398700</td></tr>

<tr><td>Slovenia</td><td>1987800</td></tr>

<tr><td>Solomon Islands</td><td>444000</td></tr>

<tr><td>Somalia</td><td>10097000</td></tr>

<tr><td>South Africa</td><td>40377000</td></tr>

<tr><td>South Georgia and the South Sandwich Islands</td><td>0</td></tr>

<tr><td>South Korea</td><td>46844000</td></tr>

<tr><td>Spain</td><td>39441700</td></tr>

<tr><td>Sri Lanka</td><td>18827000</td></tr>

<tr><td>Sudan</td><td>29490000</td></tr>

<tr><td>Suriname</td><td>417000</td></tr>

<tr><td>Svalbard and Jan Mayen</td><td>3200</td></tr>

<tr><td>Swaziland</td><td>1008000</td></tr>

<tr><td>Sweden</td><td>8861400</td></tr>

<tr><td>Switzerland</td><td>7160400</td></tr>

<tr><td>Syria</td><td>16125000</td></tr>

<tr><td>Taiwan</td><td>22256000</td></tr>

<tr><td>Tajikistan</td><td>6188000</td></tr>

<tr><td>Tanzania</td><td>33517000</td></tr>

<tr><td>Thailand</td><td>61399000</td></tr>

<tr><td>Togo</td><td>4629000</td></tr>

<tr><td>Tokelau</td><td>2000</td></tr>

<tr><td>Tonga</td><td>99000</td></tr>

<tr><td>Trinidad and Tobago</td><td>1295000</td></tr>

<tr><td>Tunisia</td><td>9586000</td></tr>

<tr><td>Turkey</td><td>66591000</td></tr>

<tr><td>Turkmenistan</td><td>4459000</td></tr>

<tr><td>Turks and Caicos Islands</td><td>17000</td></tr>

<tr><td>Tuvalu</td><td>12000</td></tr>

<tr><td>Uganda</td><td>21778000</td></tr>

<tr><td>Ukraine</td><td>50456000</td></tr>

<tr><td>United Arab Emirates</td><td>2441000</td></tr>

<tr><td>United Kingdom</td><td>59623400</td></tr>

<tr><td>United States</td><td>278357000</td></tr>

<tr><td>United States Minor Outlying Islands</td><td>0</td></tr>

<tr><td>Uruguay</td><td>3337000</td></tr>

<tr><td>Uzbekistan</td><td>24318000</td></tr>

<tr><td>Vanuatu</td><td>190000</td></tr>

<tr><td>Venezuela</td><td>24170000</td></tr>

<tr><td>Vietnam</td><td>79832000</td></tr>

<tr><td>Virgin Islands, British</td><td>21000</td></tr>

<tr><td>Virgin Islands, U.S.</td><td>93000</td></tr>

<tr><td>Wallis and Futuna</td><td>15000</td></tr>

<tr><td>Western Sahara</td><td>293000</td></tr>

<tr><td>Yemen</td><td>18112000</td></tr>

<tr><td>Yugoslavia</td><td>10640000</td></tr>

<tr><td>Zambia</td><td>9169000</td></tr>

<tr><td>Zimbabwe</td><td>11669000</td></tr>

</table>
</body>
</html>
Doba běhu: 396.2 ms