LRANGE implementation for pickle db patx#61

Author: vikneswaran20

docs/commands.html

@@ -33,6 +33,7 @@ <h1>Current Commands</h1>
 <p><code><span class="c2">LGETALL</span> <span class="c9">name</span></code> &rarr; Return all values in a list <small><em>(available since 0.1)</em></small></p>
 <p><code><span class="c2">LEXTEND</span> <span class="c9">name</span> <span class="c9">seq</span></code> &rarr; Extend a list with a sequence <small><em>(available since 0.6)</em></small></p>
 <p><code><span class="c2">LGET</span> <span class="c9">name</span> <span class="c9">pos</span></code> &rarr; Return one value in a list <small><em>(available since 0.1)</em></small></p>
+<p><code><span class="c2">LRANGE</span> <span class="c9">name</span> <span class="c9">start</span> <span class="c9">end</span></code> &rarr; Return all the values from a given range in a list <small><em></em></small></p>
 <p><code><span class="c2">LREMLIST</span> <span class="c9">name</span></code> &rarr; Remove a list and all of its values <small><em>(available since 0.1)</em></small></p>
 <p><code><span class="c2">LREMVALUE</span> <span class="c9">name</span> <span class="c9">value</span></code> &rarr; Remove a value from list <code>name</code> <small><em>(available since 0.8.2)</em></small></p>
 <p><code><span class="c2">LPOP</span> <span class="c9">name</span> <span class="c9">pos</span></code> &rarr; Remove one value in a list <small><em>(available since 0.1)</em></small></p>

pickledb.py

@@ -189,6 +189,10 @@ def lget(self, name, pos):
         '''Return one value in a list'''
         return self.db[name][pos]
 
+    def lrange(self, name, start=None, end=None):
+        '''Return range of values in a list '''
+        return self.db[name][start:end]
+
     def lremlist(self, name):
         '''Remove a list and all of its values'''
         number = len(self.db[name])

tests.py

@@ -84,6 +84,16 @@ def test_not_lexists(self):
         assert x is False
         self.db.lrem('list')
 
+    def test_lrange(self):
+        self.db.lcreate('list')
+        self.db.ladd('list','one')
+        self.db.ladd('list','two')
+        self.db.ladd('list','three')
+        self.db.ladd('list','four')
+        x = self.db.lrange('list', 1, 3)
+        assert x == ['two', 'three']
+        self.db.lremlist('list')
+
     def test_dexists(self):
         self.db.dcreate('dict')
         self.db.dadd('dict', ('key', 'value'))