code: def zipf_frequency(word, lang, wordlist='best', minimum=0.):
      
      freq_min = zipf_to_freq(minimum)
      freq = word_frequency(word, lang, wordlist, freq_min)
      return round(freq_to_zipf(freq), 2)
docs: Get the frequency of `word`, in the language with code `lang`, on the Zipf
      scale.
  
      The Zipf scale is a logarithmic frequency scale proposed by Marc Brysbaert,
      who compiled the SUBTLEX data. The goal of the Zipf scale is to map
      reasonable word frequencies to understandable, small positive numbers.
  
      A word rates as x on the Zipf scale when it occurs 10**x times per billion
      words. For example, a word that occurs once per million words is at 3.0 on
      the Zipf scale.
  
      Zipf values for reasonable words are between 0 and 8. The value this
      function returns will always be at last as large as `minimum`, even for a
      word that never appears. The default minimum is 0, representing words
      that appear once per billion words or less.
  
      wordfreq internally quantizes its frequencies to centibels, which are
      1/100 of a Zipf unit. The output of `zipf_frequency` will be rounded to
      the nearest hundredth to match this quantization.