class_docstr: The client allows to interact with RedisBloom and use all of
  it's functionality.
  
  - BF for Bloom Filter
  - CF for Cuckoo Filter
  - CMS for Count-Min Sketch
  - TOPK for TopK Data Structure
  - TDIGEST for estimate rank statistics
docstr: Append CAPACITY to params.
docstr_tok: ["Append","CAPACITY","to","params","."]
code: def append_capacity(params, capacity):
      """Append CAPACITY to params."""
      if capacity is not None:
          params.extend(["CAPACITY", capacity])
  
imports: from redis._parsers.helpers import bool_ok
  from ..helpers import get_protocol_version, parse_to_list
  from .commands import *
  from .info import BFInfo, CFInfo, CMSInfo, TDigestInfo, TopKInfo
label_desc: Use image node_id 3 for calling the AbstractBloom obj's underlying member method code with example usage: obj.append_capacity(params, capacity) without return types