redis-py API

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class redis. Redis ( host='localhost', port=6379, db=0, password=None, socket_timeout=None, connection_pool=None, charset='utf-8', errors='strict', unix_socket_path=None )

Provides backwards compatibility with older versions of redis-py that changed arguments to some commands to be more Pythonic, sane, or by accident.

lrem ( name, value, num=0 )

Remove the first num occurrences of elements equal to value from the list stored at name.

The num argument influences the operation in the following ways:

num > 0: Remove elements equal to value moving from head to tail. num < 0: Remove elements equal to value moving from tail to head. num = 0: Remove all elements equal to value.

pipeline ( transaction=True, shard_hint=None )

Return a new pipeline object that can queue multiple commands for later execution. transaction indicates whether all commands should be executed atomically. Apart from making a group of operations atomic, pipelines are useful for reducing the back-and-forth overhead between the client and server.

setex ( name, value, time )

Set the value of key name to value that expires in time seconds

zadd ( name, *args, **kwargs )

NOTE: The order of arguments differs from that of the official ZADD command. For backwards compatability, this method accepts arguments in the form of name1, score1, name2, score2, while the official Redis documents expects score1, name1, score2, name2.

If you’re looking to use the standard syntax, consider using the StrictRedis class. See the API Reference section of the docs for more information.

Set any number of element-name, score pairs to the key name. Pairs can be specified in two ways:

As *args, in the form of: name1, score1, name2, score2, ... or as **kwargs, in the form of: name1=score1, name2=score2, ...

The following example would add four values to the ‘my-key’ key: redis.zadd(‘my-key’, ‘name1’, 1.1, ‘name2’, 2.2, name3=3.3, name4=4.4)

class redis. StrictRedis ( host='localhost', port=6379, db=0, password=None, socket_timeout=None, connection_pool=None, charset='utf-8', errors='strict', unix_socket_path=None )

Implementation of the Redis protocol.

This abstract class provides a Python interface to all Redis commands and an implementation of the Redis protocol.

Connection and Pipeline derive from this, implementing how the commands are sent and received to the Redis server

append ( key, value )

Appends the string value to the value at key. If key doesn’t already exist, create it with a value of value. Returns the new length of the value at key.

bgrewriteaof ()

Tell the Redis server to rewrite the AOF file from data in memory.

bgsave ()

Tell the Redis server to save its data to disk. Unlike save(), this method is asynchronous and returns immediately.

blpop ( keys, timeout=0 )

LPOP a value off of the first non-empty list named in the keys list.

If none of the lists in keys has a value to LPOP, then block for timeout seconds, or until a value gets pushed on to one of the lists.

If timeout is 0, then block indefinitely.

brpop ( keys, timeout=0 )

RPOP a value off of the first non-empty list named in the keys list.

If none of the lists in keys has a value to LPOP, then block for timeout seconds, or until a value gets pushed on to one of the lists.

If timeout is 0, then block indefinitely.

brpoplpush ( src, dst, timeout=0 )

Pop a value off the tail of src, push it on the head of dst and then return it.

This command blocks until a value is in src or until timeout seconds elapse, whichever is first. A timeout value of 0 blocks forever.

config_get ( pattern='*' )

Return a dictionary of configuration based on the pattern

config_set ( name, value )

Set config item name with value

dbsize ()

Returns the number of keys in the current database

debug_object ( key )

Returns version specific metainformation about a give key

decr ( name, amount=1 )

Decrements the value of key by amount. If no key exists, the value will be initialized as 0 - amount

delete ( *names )

Delete one or more keys specified by names

echo ( value )

Echo the string back from the server

execute_command ( *args, **options )

Execute a command and return a parsed response

exists ( name )

Returns a boolean indicating whether key name exists

expire ( name, time )

Set an expire flag on key name for time seconds

expireat ( name, when )

Set an expire flag on key name. when can be represented as an integer indicating unix time or a Python datetime object.

flushall ()

Delete all keys in all databases on the current host

flushdb ()

Delete all keys in the current database

get ( name )

Return the value at key name, or None if the key doesn’t exist

getbit ( name, offset )

Returns a boolean indicating the value of offset in name

getset ( name, value )

Set the value at key name to value if key doesn’t exist Return the value at key name atomically

hdel ( name, *keys )

Delete keys from hash name

hexists ( name, key )

Returns a boolean indicating if key exists within hash name

hget ( name, key )

Return the value of key within the hash name

hgetall ( name )

Return a Python dict of the hash’s name/value pairs

hincrby ( name, key, amount=1 )

Increment the value of key in hash name by amount

hkeys ( name )

Return the list of keys within hash name

hlen ( name )

Return the number of elements in hash name

hmget ( name, keys )

Returns a list of values ordered identically to keys

hmset ( name, mapping )

Sets each key in the mapping dict to its corresponding value in the hash name

hset ( name, key, value )

Set key to value within hash name Returns 1 if HSET created a new field, otherwise 0

hsetnx ( name, key, value )

Set key to value within hash name if key does not exist. Returns 1 if HSETNX created a field, otherwise 0.

hvals ( name )

Return the list of values within hash name

incr ( name, amount=1 )

Increments the value of key by amount. If no key exists, the value will be initialized as amount

info ()

Returns a dictionary containing information about the Redis server

keys ( pattern='*' )

Returns a list of keys matching pattern

lastsave ()

Return a Python datetime object representing the last time the Redis database was saved to disk

lindex ( name, index )

Return the item from list name at position index

Negative indexes are supported and will return an item at the end of the list

linsert ( name, where, refvalue, value )

Insert value in list name either immediately before or after [where] refvalue

Returns the new length of the list on success or -1 if refvalue is not in the list.

llen ( name )

Return the length of the list name

lock ( name, timeout=None, sleep=0.1 )

Return a new Lock object using key name that mimics the behavior of threading.Lock.

If specified, timeout indicates a maximum life for the lock. By default, it will remain locked until release() is called.

sleep indicates the amount of time to sleep per loop iteration when the lock is in blocking mode and another client is currently holding the lock.

lpop ( name )

Remove and return the first item of the list name

lpush ( name, *values )

Push values onto the head of the list name

lpushx ( name, value )

Push value onto the head of the list name if name exists

lrange ( name, start, end )

Return a slice of the list name between position start and end

start and end can be negative numbers just like Python slicing notation

lrem ( name, count, value )

Remove the first count occurrences of elements equal to value from the list stored at name.

The count argument influences the operation in the following ways:

count > 0: Remove elements equal to value moving from head to tail. count < 0: Remove elements equal to value moving from tail to head. count = 0: Remove all elements equal to value.

lset ( name, index, value )

Set position of list name to value

ltrim ( name, start, end )

Trim the list name, removing all values not within the slice between start and end

start and end can be negative numbers just like Python slicing notation

mget ( keys, *args )

Returns a list of values ordered identically to keys

move ( name, db )

Moves the key name to a different Redis database db

mset ( mapping )

Sets each key in the mapping dict to its corresponding value

msetnx ( mapping )

Sets each key in the mapping dict to its corresponding value if none of the keys are already set

object ( infotype, key )

Return the encoding, idletime, or refcount about the key

parse_response ( connection, command_name, **options )

Parses a response from the Redis server

persist ( name )

Removes an expiration on name

ping ()

Ping the Redis server

pipeline ( transaction=True, shard_hint=None )

Return a new pipeline object that can queue multiple commands for later execution. transaction indicates whether all commands should be executed atomically. Apart from making a group of operations atomic, pipelines are useful for reducing the back-and-forth overhead between the client and server.

publish ( channel, message )

Publish message on channel. Returns the number of subscribers the message was delivered to.

pubsub ( shard_hint=None )

Return a Publish/Subscribe object. With this object, you can subscribe to channels and listen for messages that get published to them.

randomkey ()

Returns the name of a random key

rename ( src, dst )

Rename key src to dst

renamenx ( src, dst )

Rename key src to dst if dst doesn’t already exist

rpop ( name )

Remove and return the last item of the list name

rpoplpush ( src, dst )

RPOP a value off of the src list and atomically LPUSH it on to the dst list. Returns the value.

rpush ( name, *values )

Push values onto the tail of the list name

rpushx ( name, value )

Push value onto the tail of the list name if name exists

sadd ( name, *values )

Add value(s) to set name

save ()

Tell the Redis server to save its data to disk, blocking until the save is complete

scard ( name )

Return the number of elements in set name

sdiff ( keys, *args )

Return the difference of sets specified by keys

sdiffstore ( dest, keys, *args )

Store the difference of sets specified by keys into a new set named dest. Returns the number of keys in the new set.

set ( name, value )

Set the value at key name to value

set_response_callback ( command, callback )

Set a custom Response Callback

setbit ( name, offset, value )

Flag the offset in name as value. Returns a boolean indicating the previous value of offset.

setex ( name, time, value )

Set the value of key name to value that expires in time seconds

setnx ( name, value )

Set the value of key name to value if key doesn’t exist

setrange ( name, offset, value )

Overwrite bytes in the value of name starting at offset with value. If offset plus the length of value exceeds the length of the original value, the new value will be larger than before. If offset exceeds the length of the original value, null bytes will be used to pad between the end of the previous value and the start of what’s being injected.

Returns the length of the new string.

shutdown ()

Shutdown the server

sinter ( keys, *args )

Return the intersection of sets specified by keys

sinterstore ( dest, keys, *args )

Store the intersection of sets specified by keys into a new set named dest. Returns the number of keys in the new set.

sismember ( name, value )

Return a boolean indicating if value is a member of set name

slaveof ( host=None, port=None )

Set the server to be a replicated slave of the instance identified by the host and port. If called without arguements, the instance is promoted to a master instead.

smembers ( name )

Return all members of the set name

smove ( src, dst, value )

Move value from set src to set dst atomically

sort ( name, start=None, num=None, by=None, get=None, desc=False, alpha=False, store=None )

Sort and return the list, set or sorted set at name.

start and num allow for paging through the sorted data

by allows using an external key to weight and sort the items.

Use an “*” to indicate where in the key the item value is located

get allows for returning items from external keys rather than the

sorted data itself. Use an “*” to indicate where int he key the item value is located

desc allows for reversing the sort

alpha allows for sorting lexicographically rather than numerically

store allows for storing the result of the sort into

the key store

spop ( name )

Remove and return a random member of set name

srandmember ( name )

Return a random member of set name

srem ( name, *values )

Remove values from set name

strlen ( name )

Return the number of bytes stored in the value of name

substr ( name, start, end=-1 )

Return a substring of the string at key name. start and end are 0-based integers specifying the portion of the string to return.

sunion ( keys, *args )

Return the union of sets specifiued by keys

sunionstore ( dest, keys, *args )

Store the union of sets specified by keys into a new set named dest. Returns the number of keys in the new set.

transaction ( func, *watches, **kwargs )

Convenience method for executing the callable func as a transaction while watching all keys specified in watches. The ‘func’ callable should expect a single arguement which is a Pipeline object.

ttl ( name )

Returns the number of seconds until the key name will expire

type ( name )

Returns the type of key name

unwatch ()

Unwatches the value at key name, or None of the key doesn’t exist

watch ( *names )

Watches the values at keys names, or None if the key doesn’t exist

zadd ( name, *args, **kwargs )

Set any number of score, element-name pairs to the key name. Pairs can be specified in two ways:

As *args, in the form of: score1, name1, score2, name2, ... or as **kwargs, in the form of: name1=score1, name2=score2, ...

The following example would add four values to the ‘my-key’ key: redis.zadd(‘my-key’, 1.1, ‘name1’, 2.2, ‘name2’, name3=3.3, name4=4.4)

zcard ( name )

Return the number of elements in the sorted set name

zincrby ( name, value, amount=1 )

Increment the score of value in sorted set name by amount

zinterstore ( dest, keys, aggregate=None )

Intersect multiple sorted sets specified by keys into a new sorted set, dest. Scores in the destination will be aggregated based on the aggregate, or SUM if none is provided.

zrange ( name, start, end, desc=False, withscores=False, score_cast_func=<type 'float'> )

Return a range of values from sorted set name between start and end sorted in ascending order.

start and end can be negative, indicating the end of the range.

desc a boolean indicating whether to sort the results descendingly

withscores indicates to return the scores along with the values. The return type is a list of (value, score) pairs

score_cast_func a callable used to cast the score return value

zrangebyscore ( name, min, max, start=None, num=None, withscores=False, score_cast_func=<type 'float'> )

Return a range of values from the sorted set name with scores between min and max.

If start and num are specified, then return a slice of the range.

withscores indicates to return the scores along with the values. The return type is a list of (value, score) pairs

score_cast_func` a callable used to cast the score return value

zrank ( name, value )

Returns a 0-based value indicating the rank of value in sorted set name

zrem ( name, *values )

Remove member values from sorted set name

zremrangebyrank ( name, min, max )

Remove all elements in the sorted set name with ranks between min and max. Values are 0-based, ordered from smallest score to largest. Values can be negative indicating the highest scores. Returns the number of elements removed

zremrangebyscore ( name, min, max )

Remove all elements in the sorted set name with scores between min and max. Returns the number of elements removed.

zrevrange ( name, start, num, withscores=False, score_cast_func=<type 'float'> )

Return a range of values from sorted set name between start and num sorted in descending order.

start and num can be negative, indicating the end of the range.

withscores indicates to return the scores along with the values The return type is a list of (value, score) pairs

score_cast_func a callable used to cast the score return value

zrevrangebyscore ( name, max, min, start=None, num=None, withscores=False, score_cast_func=<type 'float'> )

Return a range of values from the sorted set name with scores between min and max in descending order.

If start and num are specified, then return a slice of the range.

withscores indicates to return the scores along with the values. The return type is a list of (value, score) pairs

score_cast_func a callable used to cast the score return value

zrevrank ( name, value )

Returns a 0-based value indicating the descending rank of value in sorted set name

zscore ( name, value )

Return the score of element value in sorted set name

zunionstore ( dest, keys, aggregate=None )

Union multiple sorted sets specified by keys into a new sorted set, dest. Scores in the destination will be aggregated based on the aggregate, or SUM if none is provided.

class redis. ConnectionPool ( connection_class=<class 'redis.connection.Connection'>, max_connections=None, **connection_kwargs )

Generic connection pool

disconnect ()

Disconnects all connections in the pool

get_connection ( command_name, *keys, **options )

Get a connection from the pool

make_connection ()

Create a new connection

release ( connection )

Releases the connection back to the pool

class redis. Connection ( host='localhost', port=6379, db=0, password=None, socket_timeout=None, encoding='utf-8', encoding_errors='strict', parser_class=<class 'redis.connection.PythonParser'> )

Manages TCP communication to and from a Redis server

connect ()

Connects to the Redis server if not already connected

disconnect ()

Disconnects from the Redis server

encode ( value )

Return a bytestring representation of the value

on_connect ()

Initialize the connection, authenticate and select a database

pack_command ( *args )

Pack a series of arguments into a value Redis command

read_response ()

Read the response from a previously sent command

send_command ( *args )

Pack and send a command to the Redis server

send_packed_command ( command )

Send an already packed command to the Redis server