code: def _read_regenie_df(file, trait, num_snps):
      df = pd.read_table(file, sep=r"\s+")
      df = df[df["ID"] <= num_snps]
      df["phenotype"] = trait
      return df
  
imports: from dataclasses import dataclass
  import functions
  import glow.gwas.log_reg
  import glow.gwas.approx_firth
  import pandas
  from nptyping import Float, NDArray
  import numpy
  import pytest
  from typing import Any
label_desc: Use image node_id 7 for calling a global function with example usage: _read_regenie_df(file, trait, num_snps) and returns: df