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You can search through a completed transcript for a specific set of keywords, which is useful for quickly finding relevant information. The parameter can be a list of words, numbers, or phrases up to five words. 
import assemblyai as aai

aai.settings.api_key = "<YOUR_API_KEY>"

# audio_file = "./local_file.mp3"
audio_file = "https://assembly.ai/wildfires.mp3"

config = aai.TranscriptionConfig(
  language_detection=True
)

transcript = aai.Transcriber(config=config).transcribe(audio_file)

if transcript.status == "error":
  raise RuntimeError(f"Transcription failed: {transcript.error}")

# Set the words you want to search for
words = ["foo", "bar", "foo bar", "42"]

matches = transcript.word_search(words)

for match in matches:
  print(f"Found '{match.text}' {match.count} times in the transcript")