Bitmap
BITCOUNT
Count the number of set bits.
The BITCOUNT command in Redis is used to count the number of set bits (bits with a value of 1) in a range of bytes within a key that is stored as a binary string. It is primarily used for bit-level operations on binary data stored in Redis.
Arguments
keybodystrrequired
The key to get.
startbodyint
Specify the range of bytes within the binary string to count the set bits. If not provided, it counts set bits in the entire string.
Either specify both start and end or neither.
endbodyint
Specify the range of bytes within the binary string to count the set bits. If not provided, it counts set bits in the entire string.
Either specify both start and end or neither.
Response
intrequired
The number of set bits in the specified range.
Example
redis.setbit("mykey", 7, 1)redis.setbit("mykey", 8, 1)redis.setbit("mykey", 9, 1)# With rangeassert redis.bitcount("mykey", 0, 10) == 3# Without rangeassert redis.bitcount("mykey") == 3